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0 Mercury 500 50 hp thunderbolt ignition ,kiekhaefer ,blue Mercury & Mariner Outboards
4 1982 merc 80 4 cyl thunderbolt spark plug wires needed Mercury & Mariner Outboards
3 Question about 1989 thunderbolt iv ignition module part numbers Mercruiser I/O & Inboard Engines & Outdrives
28 Mercruiser 5.7 Thunderbolt V issue Mercruiser I/O & Inboard Engines & Outdrives
10 1977 Merc 500 Thunderbolt cranking issue Mercury & Mariner Outboards
2 1980 7.5 Merc Thunderbolt female fuel connector Mercury & Mariner Outboards
10 another thunderbolt ign ? Mercruiser I/O & Inboard Engines & Outdrives
11 1996 5.7l thunderbolt V ignition Mercruiser I/O & Inboard Engines & Outdrives
1 Thunderbolt V no spark diagnosis Mercruiser I/O & Inboard Engines & Outdrives
14 Help with Thunderbolt ignition Mercruiser I/O & Inboard Engines & Outdrives
1 Thunderbolt IV Ignition Mercruiser I/O & Inboard Engines & Outdrives
2 mid 70 mercury 50 thunderbolt fuel issue Mercury & Mariner Outboards
4 Thunderbolt IV Sensor Mercruiser I/O & Inboard Engines & Outdrives
4 Mercury thunderbolt 500 50hp year please ? Mercury & Mariner Outboards
9 Thunderbolt IV Ignition Amplifier/Module Mercruiser I/O & Inboard Engines & Outdrives
6 thunderbolt amplifier Non-Repair I/O and Inboards
1 67 merc thunderbolt 650 2 fuel pumps same kit? Mercury & Mariner Outboards
8 67 merc thunderbolt 650 Boggs under load Mercury & Mariner Outboards
5 20hp mercury thunderbolt Mercury & Mariner Outboards
7 1977 Merc 500 Thunderbolt minor water jacket leak, should I fix it? Mercury & Mariner Outboards
2 My junkyard find Thunderbolt bass boat 200.00 Boat Restoration, Building, and Hull Repair
5 Carb kits and Manual for merc thunderbolt Mercury & Mariner Outboards
12 Where does the Tachometer read off of a Thunderbolt IV ignition Mercruiser I/O & Inboard Engines & Outdrives
3 1974 Mercury 500: Thunderbolt ignition replaced with magneto Mercury & Mariner Outboards
36 1970 mercury 500 thunderbolt Mercury & Mariner Outboards
4 advice on older 85 horse merc thunderbolt ignition motor. Mercury & Mariner Outboards
1 Tach for 1978 mercury thunderbolt 402 40 hp Non-Repair Outboard Discussions
2 1978 mercury M800 Thunderbolt ignition RPM gauge Mercury & Mariner Outboards
18 1964 16' Starcraft SeaMist / 1964 Mercury 500 Thunderbolt (50hp), Here We Go Again. Starcraft Boats
0 80 Merc thunderbolt ignition 40 hp reverse gear stuck Mercury & Mariner Outboards
7 Help with thunderbolt iv ignition no spark Mercruiser I/O & Inboard Engines & Outdrives
3 1996 mercruiser 5.7 thunderbolt v Mercruiser I/O & Inboard Engines & Outdrives
11 1978 Mercury Blackmax Thunderbolt Ign. 150 V6- Engine Coupler ?? Mercury & Mariner Outboards
2 throttle problem with 700 Mercury Thunderbolt or Merc controls Mercury & Mariner Outboards
7 replacement ignition coil .. which one ? merc 260 thunderbolt iv 5.7L Mercruiser I/O & Inboard Engines & Outdrives
3 mercury 500 thunderbolt wiring harness fuse and rectifier Mercury & Mariner Outboards
10 4.3 lx thunderbolt spark plugs Mercruiser I/O & Inboard Engines & Outdrives
3 Mercury Thunderbolt 4 HP or Eska 3.5 HP Non-Repair Outboard Discussions
9 Help with Serial No for 115HP Thunderbolt ignition/Power Trim Mercury & Mariner Outboards
4 1976 Thunderbolt 1150 Secondary Timing Problem Mercury & Mariner Outboards
7 1970 Merc 50hp Thunderbolt Mercury & Mariner Outboards
13 Mercury Thunderbolt Blueband 850 No spark Mercury & Mariner Outboards
5 1993 mercruiser 5.7 with thunderbolt ign. problems Mercruiser I/O & Inboard Engines & Outdrives
4 1997 4.3 LX Thunderbolt Non-Repair I/O and Inboards
0 1998 thunderbolt troubleshooting Mercruiser I/O & Inboard Engines & Outdrives
5 '76 Thunderbolt 850 problems... Mercury & Mariner Outboards
2 1982 40 hp mercury outboard question (thunderbolt model) Mercury & Mariner Outboards
2 1982 40 hp mercury outboard question (thunderbolt model) Boat Topics and Questions (not engine topics)
20 Thunderbolt 4 engineTiming Mercruiser I/O & Inboard Engines & Outdrives
3 1997 5.7 mercruiser thunderbolt V Mercruiser I/O & Inboard Engines & Outdrives
5 Thunderbolt vs. HEI Mercruiser I/O & Inboard Engines & Outdrives
6 Mercruiser 4.3L v6 TKS Thunderbolt IV Mercruiser I/O & Inboard Engines & Outdrives
5 Mercruiser Thunderbolt 5 ignition timing Mercruiser I/O & Inboard Engines & Outdrives
11 Another issue, ignition switch on 4.3l mercruiser w/thunderbolt Mercruiser I/O & Inboard Engines & Outdrives
1 Help with!! 85hp mercury thunderbolt manuals? Mercury & Mariner Outboards
21 Help with Thunderbolt IV Mercruiser I/O & Inboard Engines & Outdrives
2 Mercury 650 thunderbolt 1975 water coming out of exhaust after impeller change. Mercury & Mariner Outboards
0 50hp Thunderbolt suddenly won't go above idle Mercury & Mariner Outboards
2 New owner of a Thunderbolt 850 Mercury & Mariner Outboards
7 9.8 model 110 thunderbolt points replacement Mercury & Mariner Outboards
2 Mercury 20hp 200 thunderbolt wiring diagram Mercury & Mariner Outboards
5 thunderbolt inition Mercruiser I/O & Inboard Engines & Outdrives
3 1988 mercruiser 5.7 thunderbolt IV ICM Mercruiser I/O & Inboard Engines & Outdrives
0 Water flow 72 Thunderbolt Mercury & Mariner Outboards
39 1984 5.7L thunderbolt 4 timing chain question Mercruiser I/O & Inboard Engines & Outdrives
0 40hp 402 Mercury Thunderbolt with seized choke lever Mercury & Mariner Outboards
1 71 mercury thunderbolt Mercury & Mariner Outboards
26 1993 7.4L/Bravo 1 - Thunderbolt IV Ignition Issues (Again) Mercruiser I/O & Inboard Engines & Outdrives
3 Mercruiser thunderbolt iv failed looking to run mallory help Mercruiser I/O & Inboard Engines & Outdrives
6 thunderbolt 800 wont go into gear... Mercury & Mariner Outboards
0 1975? 150 Thunderbolt flywheel Mercury & Mariner Outboards
11 1970s (I believe) mercury 850 with thunderbolt ignition. Having cooling system issues Mercury & Mariner Outboards
1 thunderbolt 800 carb.. Mercury & Mariner Outboards
1 Mercury Thunderbolt no spark Mercury & Mariner Outboards
1 mercury 500 thunderbolt help Mercury & Mariner Outboards
4 Mercruiser V8 thunderbolt (305) ignition issue Mercruiser I/O & Inboard Engines & Outdrives
0 Suggestions needed Mercury thunderbolt 850 Mercury & Mariner Outboards
6 1970 mercury thunderbolt 650 Mercury & Mariner Outboards
6 Thunderbolt 800 - flywheel rattle Mercury & Mariner Outboards
10 5.7 thunderbolt weak spark Mercruiser I/O & Inboard Engines & Outdrives
1 Mercury Thunderbolt 500 control wire detachment. Mercury & Mariner Outboards
9 1972 mecury thunderbolt 40 hp (how to remove lower unit?) thanks in advance! Mercury & Mariner Outboards
9 Mercury Thunderbolt 500 Mercury & Mariner Outboards
0 1970 mercury thunderbolt 650 Mercury & Mariner Outboards
2 Tachometer connector 1969 merc Thunderbolt 650 Mercury & Mariner Outboards
5 thunderbolt years Mercury & Mariner Outboards
0 Fuel smell from exhaust of 5.7 lx thunderbolt V Mercruiser I/O & Inboard Engines & Outdrives
14 Mercruiser Thunderbolt V ignition problem? Mercruiser I/O & Inboard Engines & Outdrives
4 1971 Mercury 500 thunderbolt powerpack help needed. Mercury & Mariner Outboards
20 96 Thunderbolt V no Voltage at coil? Mercruiser I/O & Inboard Engines & Outdrives
7 1972 Mercury Thunderbolt 500 Help Needed Mercury & Mariner Outboards
2 need help diagnosing Mercruiser 7.4 with Thunderbolt IV ignition Mercruiser I/O & Inboard Engines & Outdrives
40 50 hp thunderbolt help Mercury & Mariner Outboards
17 Weird Thunderbolt V problem, driving me mad Mercruiser I/O & Inboard Engines & Outdrives
4 No Spark resulting in Tow of Shame 7.4L Thunderbolt 5 ignition Mercruiser I/O & Inboard Engines & Outdrives
1 115 thunderbolt control box Mercury & Mariner Outboards
0 1981 mercury thunderbolt 50hp Mercury & Mariner Outboards
2 mercruiser 5.7 comp ski thunderbolt IV ignition Mercruiser I/O & Inboard Engines & Outdrives
5 Mercury 700 Thunderbolt -80 running slow (Sweden) Mercury & Mariner Outboards
5 re thunderbolt stop circuit Mercury & Mariner Outboards
13 1500 thunderbolt questions Mercury & Mariner Outboards
8 Whats the best plug, wires and outdrive upgrades for the 4.3l w/Thunderbolt ???? Mercruiser I/O & Inboard Engines & Outdrives
1 71 mercury 500 thunderbolt Mercury & Mariner Outboards
17 Thunderbolt IV Mercruiser I/O & Inboard Engines & Outdrives
1 Windshield for 86 thunderbolt 15.5 sportfisher Boat Restoration, Building, and Hull Repair
9 Thunderbolt V timing issue. Mercruiser I/O & Inboard Engines & Outdrives
0 re mercury thunderbolt 50 Mercury & Mariner Outboards
1 Mercury 850 Thunderbolt Mercury & Mariner Outboards
3 50 hp thunderbolt Mercury & Mariner Outboards
3 lost, thunderbolt iv start issue Mercruiser I/O & Inboard Engines & Outdrives
28 Thunderbolt IV ignition questions Mercruiser I/O & Inboard Engines & Outdrives
2 1982 40 hp thunderbolt ignition problem Mercury & Mariner Outboards
3 1978 mercury thunderbolt 402 40 hp bogging under load Mercury & Mariner Outboards
2 1973 Mercury 850 thunderbolt fuel problem Mercury & Mariner Outboards
10 1999 mercruiser base timing, Thunderbolt V ignition Mercruiser I/O & Inboard Engines & Outdrives
6 Black wire coming out of bottom of Thunderbolt distributor - where does it go? Mercruiser I/O & Inboard Engines & Outdrives
3 help wth thunderbolt 500-50 1978 Mercury & Mariner Outboards
1 Need trim bleed procedure for 1970 Mercury Thunderbolt 1350 Mercury & Mariner Outboards
2 80hp Thunderbolt Year? Mercury & Mariner Outboards
1 1983 Mercury Thunderbolt WHAT'S MISSING?? Mercury & Mariner Outboards
7 Mercruiser 5.7 Alpha Thunderbolt V won’t start/run (**Cont.**) Mercruiser I/O & Inboard Engines & Outdrives
10 Mercruiser Thunderbolt IV no power to coil Mercruiser I/O & Inboard Engines & Outdrives
7 1974 Mercury Thunderbolt 115hp - Carb Rebuild Instructions Mercury & Mariner Outboards
2 1979 Mercury Thunderbolt 80 hp power trim Mercury & Mariner Outboards
4 1973 650 thunderbolt ? about nuetral Mercury & Mariner Outboards
7 1974 Mercury Thunderbolt 7.5 hp , switch box test , wiring? Mercury & Mariner Outboards
4 1250 thunderbolt please help very new to boating Mercury & Mariner Outboards
1 1977 Mercury Thunderbolt 500 (50hp) - Jet? Mercury & Mariner Outboards
4 Mercury 402 thunderbolt year and serial number Mercury & Mariner Outboards
79 1973 Mercury Thunderbolt 500 50hp no power and horrible fuel economy! Mercury & Mariner Outboards
3 '72 Mercury Thunderbolt Ignition wiring? Mercury & Mariner Outboards
0 1974 650 thunderbolt ign Mercury & Mariner Outboards
2 70 thunderbolt 500 with good compression and water in number 4 Mercury & Mariner Outboards
6 Need rotor for 77 1500 Merc In line 6 with Thunderbolt ignition Mercury & Mariner Outboards
10 Another Thunderbolt Ignition Problem Mercruiser I/O & Inboard Engines & Outdrives
4 1982 Mercury 115 thunderbolt Wiring Mercury & Mariner Outboards
1 1971 Mercury 500 Thunderbolt leaking from water jacket and snapped bolts on water jac Mercury & Mariner Outboards
6 Mercury Thunderbolt? 30hp?? 1963??? Mercury & Mariner Outboards
2 thunderbolt v Non-Repair I/O and Inboards
10 1981 Mercury 50HP Thunderbolt 4 cylinder stator specs, is mine bad? Mercury & Mariner Outboards
3 1974 115hp Mercury Outboard Thunderbolt - Bogging issue Mercury & Mariner Outboards
1 Problems with drive shaft out of 1977 mercury 70 hp Thunderbolt 700 series Mercury & Mariner Outboards
3 Irregular spark advance Thunderbolt IV Mercruiser I/O & Inboard Engines & Outdrives
18 Mercruiser 5.7 alpha thunderbolt IV - nightmare - no start Mercruiser I/O & Inboard Engines & Outdrives
14 Kill Switch 1974 Mercury 50HP Thunderbolt Ignition Mercury & Mariner Outboards
0 mercury 50hp 500 thunderbolt adjustment Mercury & Mariner Outboards
5 1977 Thunderbolt 850 compatibility with New merc control box Mercury & Mariner Outboards
5 omc 5.0 gm with thunderbolt lV OMC I/O & Inboard Engines & Outdrives
2 thunderbolt ignition, is it a lV or a V Mercruiser I/O & Inboard Engines & Outdrives
0 Anyone interested in parts from a 400E super thunderbolt?/ I have some questions. Mercury & Mariner Outboards
17 1990 7.4L BlueWaterInboard (454 CID) with Thunderbolt IV Ignition Mercruiser I/O & Inboard Engines & Outdrives
3 1971 Mercury 7.5 hp Thunderbolt Ignition Mercury & Mariner Outboards
3 Year Model for Australian Mercury 850 blue band with thunderbolt ignition Mercury & Mariner Outboards
4 1983 Mercury Thunderbolt arcing Mercury & Mariner Outboards
4 Mercruiser Thunderbolt IV Coil Mercruiser I/O & Inboard Engines & Outdrives
11 mercruiser thunderbolt V sensor problem Mercruiser I/O & Inboard Engines & Outdrives
6 1973 mercury thunderbolt 850 Mercury & Mariner Outboards
11 Difference between mercury thunderbolt 1150 and 1500? Mercury & Mariner Outboards
4 Compression test on 1973 mercury thunderbolt 850 Mercury & Mariner Outboards
12 1974 Mercury 500 Thunderbolt lower unit swap Mercury & Mariner Outboards
10 No Spark on 1991 Force 150 with thunderbolt igniton.... Help Force & Chrysler Outboards
5 Thunderbolt V Ignition Timing Mercruiser I/O & Inboard Engines & Outdrives
6 How do i check Mercury thunderbolt 850 cooling system? Mercury & Mariner Outboards
12 HELP HELP PLEASE!!! 1990 merc 4.3L with thunderbolt iv ignition sunk Mercruiser I/O & Inboard Engines & Outdrives
15 1971 Mercury 500 50HP Thunderbolt Ignition Mercury & Mariner Outboards
3 '72 500 Thunderbolt stator output. Mercury & Mariner Outboards
11 Quicksilver Thunderbolt DPS (for Volvo Penta Duo Prop) Prop Questions and Topics
10 1958 mercury mark 58 thunderbolt four lower unit removal Mercury & Mariner Outboards
3 thunderbolt ivnition question Mercruiser I/O & Inboard Engines & Outdrives
4 1968 Mercury 125hp with Thunderbolt ignition Mercury & Mariner Outboards
12 1958 mercury mark 58 thunderbolt four lower unit diagram Mercury & Mariner Outboards
13 79 thunderbolt 500 blue 50hp starter not engaging flywheel Mercury & Mariner Outboards
0 1958 mercury mark 58 thunderbolt four motor for sale Boat Restoration, Building, and Hull Repair
3 1972 mercury 500 50 hp thunderbolt ign Mercury & Mariner Outboards
6 Mercury Thunderbolt model mark 58 serial no 1155298.What do I have here? Non-Repair Outboard Discussions
7 Thunderbolt - on mark 4 Mercruiser I/O & Inboard Engines & Outdrives
1 1975 Mecury Thunderbolt 500 - Tillotson KA26BT Carb has bad idle tubes. Now what? Mercury & Mariner Outboards
9 1976 thunderbolt 500 - wiring rigged by a previous owner Mercury & Mariner Outboards
2 Mercury 850 Thunderbolt What Year? Mercury & Mariner Outboards
17 Prop mercury 500 thunderbolt Prop Questions and Topics
3 Mercury ThunderBolt 650 Shift Problem Mercury & Mariner Outboards
1 Prop mercury 500 thunderbolt Mercury & Mariner Outboards
4 Mercury Thunderbolt Ignition Driver "Fuel" Line Connections Mercury & Mariner Outboards
3 Mercury 850 Thunderbolt - can't find the year.... Mercury & Mariner Outboards
3 1971 9.8 Thunderbolt with no spark Mercury & Mariner Outboards
6 Distributor cap for a 72 thunderbolt 500 Mercury & Mariner Outboards
3 Thunderbolt 500 Idle Tubes Mercury & Mariner Outboards
7 mercurt thunderbolt idle Mercury & Mariner Outboards
6 Mercury 800 thunderbolt issues Mercury & Mariner Outboards
15 Thunderbolt 4 no spark Baffled Mercruiser I/O & Inboard Engines & Outdrives
1 Gear engaging issues with 1979 Mercury 800 80hp Thunderbolt. Mercury & Mariner Outboards
14 1993 7.4L Bravo/Thunderbolt IV Ignition Problem Mercruiser I/O & Inboard Engines & Outdrives
0 wiring diagram 1972 Mercury thunderbolt Mercury & Mariner Outboards
2 1976 85hp merc flywheel Thunderbolt ign. Mercury & Mariner Outboards
4 Replaced Shift Cable on 1972 Merc 500 Thunderbolt with Pump- Now Boat Wont Plane Mercury & Mariner Outboards
4 thunderbolt switchbox, how it works? Mercury & Mariner Outboards
2 help needed Thunderbolt V ignition timming Mercruiser I/O & Inboard Engines & Outdrives
11 Thunderbolt IV ignition questions and timing Mercruiser I/O & Inboard Engines & Outdrives
3 1979 70HP Mercury Thunderbolt Cold Start Problems Mercury & Mariner Outboards
1 85hp merc. thunderbolt ign. Mercury & Mariner Outboards
14 1975 Mercury 850 Thunderbolt 85hp Mercury & Mariner Outboards
1 no power to 2 coils 85hp thunderbolt ign. merc. Mercury & Mariner Outboards
1 2000 mercruiser 5.7 EFI w/ thunderbolt wont start Mercruiser I/O & Inboard Engines & Outdrives
10 70 merc 650 thunderbolt waterpump Mercury & Mariner Outboards
1 mercury 500 thunderbolt difficult to turnover Mercury & Mariner Outboards
1 Thunderbolt 500 flywheel compatibility? Mercury & Mariner Outboards
1 s/n help Mercury thunderbolt 1150 Mercury & Mariner Outboards
7 Replacing thunderbolt IV with mallor igntion. Non-Repair I/O and Inboards
4 1974 Mercury 500 thunderbolt 50hp idles poorly, stalls going into gear Mercury & Mariner Outboards
5 Thunderbolt IV ignition rotor removal problem Mercruiser I/O & Inboard Engines & Outdrives
27 thunderbolt 500 please help with gear adjustments Mercury & Mariner Outboards
4 1973 Thunderbolt 500 leaking oil Mercury & Mariner Outboards
4 Mercury thunderbolt 402 won't start Mercury & Mariner Outboards
1 Lost all power on 2001 Rinker Captiva.5.0 Mercruiser Thunderbolt V Mercruiser I/O & Inboard Engines & Outdrives
1 mercury 500 50hp thunderbolt engine carb questions 3572822 Mercury & Mariner Outboards
2 need to know where to get stuff to rebuild fuel pump on 50 hp thunderbolt 3572822 Mercury & Mariner Outboards
7 Wiring problem on 350 mag Mercruiser Thunderbolt 4 (module on distributor) Mercruiser I/O & Inboard Engines & Outdrives
5 merc thunderbolt 1150 mount problem Mercury & Mariner Outboards
2 1964 mercury thunderbolt 50hp Mercury & Mariner Outboards
1 1968 Thunderbolt 500 with type II ignition Mercury & Mariner Outboards
3 83 thunderbolt 50 botched lync and sync ran great just before it died! Mercury & Mariner Outboards
0 1971 Thunderbolt - is she worth it? Mercury & Mariner Outboards
9 Stuck in first gear Mercury Thunderbolt 85 Hp Mercury & Mariner Outboards
2 1970 mercruiser thunderbolt 650 idle issue Mercury & Mariner Outboards
1 Thunderbolt IV to Electronic Shift interrupter wiring Mercruiser I/O & Inboard Engines & Outdrives
1 850 mercury thunderbolt Mercury & Mariner Outboards
16 1971 Mercury 115 (1150) Thunderbolt Mercury & Mariner Outboards
4 Mercury 110 9.8hp thunderbolt what year / what spark plug Mercury & Mariner Outboards
7 Checking timing on 4.3L Thunderbolt IV Mercruiser I/O & Inboard Engines & Outdrives
3 Swapping Merc 1150 thunderbolt ignition with a Merc 650 thunderbolt ignition Mercury & Mariner Outboards
14 5.7 Thunderbolt IV Timing Mercruiser I/O & Inboard Engines & Outdrives
0 1968 mercury 500 thunderbolt cooling problems Mercury & Mariner Outboards
2 Missing trim tab on1982 Mercury 40 hp.Thunderbolt Mercury & Mariner Outboards
8 1976 mercury 500 50hp thunderbolt classic boggs out Mercury & Mariner Outboards
3 No RPM'S 4.3l 1988 thunderbolt IV Mercruiser I/O & Inboard Engines & Outdrives
19 5.7 4v ignition module thunderbolt IV question Mercruiser I/O & Inboard Engines & Outdrives
11 Mercruiser 350 260 thunderbolt iv having fuel and or ignition problem Mercruiser I/O & Inboard Engines & Outdrives
1 78 Merc Thunderbolt starting problems Mercury & Mariner Outboards
31 Thunderbolt IV Problems Mercruiser I/O & Inboard Engines & Outdrives
7 5.7L Thunderbolt Ignition Alpha One Gen II will not accelerate above 1500 rpm in gear Mercruiser I/O & Inboard Engines & Outdrives
2 Thunderbolt Ignition Analyzer Mercury & Mariner Outboards
10 1972 800 thunderbolt ignition problems Mercury & Mariner Outboards
3 Need some advice Thunderbolt IV problem Mercruiser I/O & Inboard Engines & Outdrives
13 1972 800 thunderbolt ignition problems Mercury & Mariner Outboards
39 1974Mercury 1150 Thunderbolt won't start! HELP!.. Please? Mercury & Mariner Outboards
1 Need a stator assembly for a 1974 merc 20 hp with Thunderbolt ignition Mercury & Mariner Outboards
2 Distributor Cap - Firing Order 5.7 Bravo Thunderbolt V Mercruiser I/O & Inboard Engines & Outdrives
4 power loss under engine load mercruiser 4.3l thunderbolt IV Mercruiser I/O & Inboard Engines & Outdrives
0 1972-3 Mercury thunderbolt 500....rectifier is getting hot! Mercury & Mariner Outboards
5 Thunderbolt 4 to mallory marine Mercruiser I/O & Inboard Engines & Outdrives
3 Thunderbolt IV timing Mercruiser I/O & Inboard Engines & Outdrives
30 Merc 5.7L thunderbolt pulled to fix transom. Now what? Mercruiser I/O & Inboard Engines & Outdrives
5 1978 thunderbolt 1400 tach wiring(sorry...guys) Mercury & Mariner Outboards
3 Need help with timing belt on Mercury thunderbolt 1500 150hp Mercury & Mariner Outboards
2 Looking for a Service Manual for a 1987 Mercruiser Alpha One 260/V8 w/ Thunderbolt Non-Repair I/O and Inboards
4 79 mercury thunderbolt stop switch Mercury & Mariner Outboards
2 1970's mercury 115 thunderbolt inline 6 wont idle down or go in gear... Mercury & Mariner Outboards
0 1975 mercury thunderbolt 9.8hp spark plug Mercury & Mariner Outboards
4 no spark 1974 50hp thunderbolt 500 Mercury & Mariner Outboards
1 87 Thundercraft Mercruiser 5.7 Alpha 1 with thunderbolt ignition running problems Mercruiser I/O & Inboard Engines & Outdrives
6 Need info on a Mercury 850 Thunderbolt (4cyl) Mercury & Mariner Outboards
2 What yeear is my 9.8 thunderbolt mercury Mercury & Mariner Outboards
9 4.3L v6 mercruiser with thunderbolt IV ignition loses power at high rpms Mercruiser I/O & Inboard Engines & Outdrives
7 Merc Thunderbolt 50 - what year? And prop? Mercury & Mariner Outboards
18 1150 115hp Thunderbolt ignition (Need Super Mech!!) Mercury & Mariner Outboards
7 Considering purchase: 1975 14' Springbok with 1975 Merc Thunderbolt 50hp Boat Topics and Questions (not engine topics)
15 Thunderbolt IV Ignition - can a V6 version be used on the V8? Mercruiser I/O & Inboard Engines & Outdrives
0 Mercury 40hp Thunderbolt Air/Fuel Mixture Screw Adjustment Mercury & Mariner Outboards
233 1996 mercruiser 5.7 with thunderbolt ignition ... Top End knock Please Help Mercruiser I/O & Inboard Engines & Outdrives
1 mercruiser 4.3 thunderbolt ign problem Mercruiser I/O & Inboard Engines & Outdrives
4 Merc 5.7L Thunderbolt 5 Ign, RPM bogging down at 3K occasionally?? Mercruiser I/O & Inboard Engines & Outdrives
7 '75 Mercury 850 Thunderbolt 85HP Mercury & Mariner Outboards
1 50 hp Mercury Thunderbolt that won't start Mercury & Mariner Outboards
1 1973 Merc. 850 Thunderbolt 85hp Skipping Mercury & Mariner Outboards
2 1976 Merc 500 thunderbolt oil leak? Mercury & Mariner Outboards
0 Newbie with a Merc 650 Thunderbolt Mercury & Mariner Outboards
2 78 40HP Mercury 2stoke No Power from key to cyclenoid (thunderbolt ignition) Mercury & Mariner Outboards
3 '84 898 Thunderbolt timing help Mercruiser I/O & Inboard Engines & Outdrives
12 Thunderbolt IV ignition problems. 3 coils in 2 days. Mercruiser I/O & Inboard Engines & Outdrives
2 1972 mercury 800 thunderbolt Mercury & Mariner Outboards
1 can you convert a 1976 mercury 500 thunderbolt 50hp to an electric start from pull? Mercury & Mariner Outboards
2 76 thunderbolt 850 reverse cam lock position? Mercury & Mariner Outboards
1 Mercury 500 thunderbolt overheating Mercury & Mariner Outboards
2 1975 Mercury 500 Thunderbolt Lower Unit Rebuild Mercury & Mariner Outboards
4 Need help on putting the Lower unit back 76 850 thunderbolt Mercury & Mariner Outboards
5 Mercruiser Distributor Cap replacement 5.0L 1999 thunderbolt Mercruiser I/O & Inboard Engines & Outdrives
3 '72 65hp thunderbolt still clicking Mercury & Mariner Outboards
5 Mercury 500 thunderbolt stuck in reverse Mercury & Mariner Outboards
4 Mercury Thunderbolt 300 Mercury & Mariner Outboards
7 mercury thunderbolt 85hp Mercury & Mariner Outboards
15 Mercury 850 Thunderbolt 85 Hp Bogging Down Mercury & Mariner Outboards
1 has my 402 thunderbolt been altered? Mercury & Mariner Outboards
6 Mercury 850 thunderbolt questions Mercury & Mariner Outboards
8 1974 85hp 850 thunderbolt idles too fast, idle stop all the way out Mercury & Mariner Outboards
1 1970 thunderbolt still no spark Mercury & Mariner Outboards
1 1972 Mercury 800 Thunderbolt won't idle below 1500 RPM .... Please Help!! Mercury & Mariner Outboards
4 1973/74 850 thunderbolt Mercury & Mariner Outboards
11 Mercury 1150 thunderbolt - can I install an electric fuel pump without issue? Mercury & Mariner Outboards
0 1973 7.5 Merc Thunderbolt, Sfat is loose in saddle/yoke, How to remove the play? Mercury & Mariner Outboards
9 94, 5.0LX Alpha with Thunderbolt IV swap to 5.7 motor Mercruiser I/O & Inboard Engines & Outdrives
2 650 mercury thunderbolt problems Mercury & Mariner Outboards
2 Mercruiser Thunderbolt ignition - No spark ? 260 Mercruiser I/O & Inboard Engines & Outdrives
6 Thunderbolt IV 5.7L V8 Stalls when jumping to full throttle Mercruiser I/O & Inboard Engines & Outdrives
2 74 mercury thunderbolt 500 please help stalls Mercury & Mariner Outboards
1 Ignition Issues 4.3L Thunderbolt IV Mercruiser I/O & Inboard Engines & Outdrives
5 What should I do? Merc 650 Thunderbolt Mercury & Mariner Outboards
1 800 thunderbolt wont idle long Mercury & Mariner Outboards
7 1979 Mercury 80hp Thunderbolt Mercury & Mariner Outboards
3 mercury thunderbolt red and blue bands Mercury & Mariner Outboards
0 1979 70 hp thunderbolt Mercury & Mariner Outboards
2 1971/1975 mercury 50hp 500 thunderbolt hose routing? Mercury & Mariner Outboards
8 1966 Mercury 950SS Thunderbolt Non-Repair Outboard Discussions
4 1974 Mercury Thunderbolt 50 HP Bogs down/Shuts off Mercury & Mariner Outboards
4 cant get the lower unit of my 1972 merk thunderbolt 500 50hp any ideas has video Mercury & Mariner Outboards
4 50 hp Merc Thunderbolt 1983 model - stutters sometimes while cruising Mercury & Mariner Outboards
4 1977 Thunderbolt 850, engine died at idle, wont restart....HELP! Mercury & Mariner Outboards
5 74 merc thunderbolt 50 hp tilt trim installation Mercury & Mariner Outboards
3 1996 4.3LX Thunderbolt IV Ignition problem Mercruiser I/O & Inboard Engines & Outdrives
2 1969 mercury 7.5 thunderbolt flooding out Mercury & Mariner Outboards
17 4.3L Distributor Should this model have Thunderbolt and ignition module? Mercruiser I/O & Inboard Engines & Outdrives
4 4.3LX Ignition Coil Thunderbolt IV Info Mercruiser I/O & Inboard Engines & Outdrives
0 Mercury Thunderbolt Tach Gauge Help! Electrical, Electronics, Audio and Trolling Motors
6 mercury thunderbolt trigger question Mercury & Mariner Outboards
2 1975 Mercury Thunderbolt 200 remote control connection problems. Mercury & Mariner Outboards
2 mercury thunderbolt 7.5 hp outboard Mercury & Mariner Outboards
3 Steering system/kit for a 1974 Mercury 500 Thunderbolt Boat Restoration, Building, and Hull Repair
2 1986 50HP Thunderbolt Propping issue Prop Questions and Topics
1 1986 50HP Thunderbolt Propping issue Mercury & Mariner Outboards
4 Adding T&T to a 1971 650 Thunderbolt Mercury & Mariner Outboards
8 1971 Mercury 650 Thunderbolt long shaft convert to short? Mercury & Mariner Outboards
1 73 Mercury 500 Thunderbolt weight Mercury & Mariner Outboards
8 Trim Issues on mercury 850 thunderbolt Mercury & Mariner Outboards
23 MERCURY BLUEBAND 50HP THUNDERBOLT Mercury & Mariner Outboards
3 Mercury Thunderbolt 850 Blueband Mercury & Mariner Outboards
7 1974 Mercury Thunderbolt 50 HP Mercury & Mariner Outboards
10 1969-1970 7.5 Thunderbolt Mercury & Mariner Outboards
7 Mercruiser4.3L 175hp thunderbolt ignition won't start after running great Mercruiser I/O & Inboard Engines & Outdrives
4 Filling the lower unit..The lower plug 850 Thunderbolt circa 1977 Mercury & Mariner Outboards
6 1974 Mercury 500 Thunderbolt manual tilt not working Mercury & Mariner Outboards
1 HELP! I have a 1974 Mercury thunderbolt 500, and cant tilt the motor....its manuel Mercury & Mariner Outboards
12 Thunderbolt IV wiring question Mercruiser I/O & Inboard Engines & Outdrives
3 Mercury 500 50hp thunderbolt questions Mercury & Mariner Outboards
1 What year is my Mercury Thunderbolt 9.8 hp #3450414 Mercury & Mariner Outboards
23 timing 4.3 with thunderbolt ignition Mercruiser I/O & Inboard Engines & Outdrives
7 1973 Mercury 500 50 HP Thunderbolt Ignition model # 3482627 Spark Advance/Throttle ?s Mercury & Mariner Outboards
3 1969 Merc 800 thunderbolt (80HP) rebuild Mercury & Mariner Outboards
2 85 merc thunderbolt with high voltage problem Mercury & Mariner Outboards
3 '73 850 thunderbolt won't top out in acceleration Mercury & Mariner Outboards
1 1978 Thunderbolt 700 Mercury & Mariner Outboards
1 1000/100hp mercury thunderbolt ignition question Electrical, Electronics, Audio and Trolling Motors
4 How many drain plugs on a 1996 Mercruiser 4.3LX Gen+ (Thunderbolt 5) Mercruiser I/O & Inboard Engines & Outdrives
2 20 hp mercury thunderbolt problems Mercury & Mariner Outboards
8 Is this Carb missing cover? Merc 1978 1115 115HP Thunderbolt Mercury & Mariner Outboards
3 71 Thunderbolt 800 Tilt and Trim Cylinder Bracket Removal Issue Mercury & Mariner Outboards
2 Mercury Thunderbolt 20 hp Mercury & Mariner Outboards
2 Thunderbolt Ignition Test Mercruiser I/O & Inboard Engines & Outdrives
1 PDF wiring diagram merc 500 thunderbolt?? Mercury & Mariner Outboards
4 1969 thunderbolt 800 no compression on #3 Mercury & Mariner Outboards
3 Thunderbolt IV ignition - distributor - sensor wheel Mercruiser I/O & Inboard Engines & Outdrives
2 1992 Mercruiser 4.3 LX Thunderbolt IV - Good or Bad Engine? Common Problems? Mercruiser I/O & Inboard Engines & Outdrives
1 What year did thunderbolt v replace IV Mercruiser I/O & Inboard Engines & Outdrives
4 85 Mercury outboard with Thunderbolt ignition. Won't idle. 1970's Mercury & Mariner Outboards
6 Mercury 50hp Thunderbolt Lower unit lube problems/questions Mercury & Mariner Outboards
27 Mercury Thunderbolt 850 Blue Stripe 1976 85hp Green Corroded Wires (Photos) Mercury & Mariner Outboards
4 thunderbolt iv 4.3 with v8 22 degree advance module work ? Mercruiser I/O & Inboard Engines & Outdrives
0 1969 thunderbolt 800 wire help all wires ar green and coming apart????? Mercury & Mariner Outboards
20 1972 Mercury 650 65 hp 3 cylinder thunderbolt (Power/Throttle/Spark) Mercury & Mariner Outboards
6 50hp thunderbolt 500 Mercury & Mariner Outboards
1 Thunderbolt icm conversion help please!!... Mercruiser I/O & Inboard Engines & Outdrives
2 4.3 L 190 HP Thunderbolt V Engine overturns for about 30-45 seconds when stopped Mercruiser I/O & Inboard Engines & Outdrives
4 need help, merc 260 thunderbolt IV engine dying Mercruiser I/O & Inboard Engines & Outdrives
3 Mercruiser 4.3L Thunderbolt IV Rotor Rotational Play Mercruiser I/O & Inboard Engines & Outdrives
7 4.3 thunderbolt IV idle adjustment Mercruiser I/O & Inboard Engines & Outdrives
3 Tach doesn't work on my 77 1150 thunderbolt Mercury & Mariner Outboards
19 Would really appreciate help with Spark on Mercury 1000 Thunderbolt ignition, 1968? Mercury & Mariner Outboards
10 Merc 200 thunderbolt newb questions Mercury & Mariner Outboards
11 1970 65hp mercury thunderbolt outboard has trouble starting fuel pump? Mercury & Mariner Outboards
12 Mercury model 1150 thunderbolt 115hp - Power Cut while running Mercury & Mariner Outboards
1 50Mercury thunderbolt won't idle or open all the way up Mercury & Mariner Outboards
1 Help My.....50hp Mercury thunderbolt won't start Mercury & Mariner Outboards
1 need help 1978 80hp thunderbolt ignition Mercury & Mariner Outboards
619 What kind of boat(s) do you own? Boat Topics and Questions (not engine topics)
0 Merc mark 55 Thunderbolt Thunderbolt
3 Is this serial number 0F821387 a Thunderbolt IV ignition or not? Mercruiser I/O & Inboard Engines & Outdrives
0 1978 500 50 hsp merc thunderbolt Mercury & Mariner Outboards
5 1971 Thunderbolt 500 Lower Unit Stuck on Exhaust Mercury & Mariner Outboards
4 1970s-80s ? merc thunderbolt ingition. 80hp 800series knock knock knocking !!! Mercury & Mariner Outboards
1 Mercury Thunderbolt 500 possible fuel problem Thunderbolt
2 merc thunderbolt 850 Mercury & Mariner Outboards
3 '77 Mercury 1150 Thunderbolt Carburetor issues Mercury & Mariner Outboards
1 5.7 mercruiser 350 thunderbolt ignition no spark Mercruiser I/O & Inboard Engines & Outdrives
2 thunderbolt v problems Mercruiser I/O & Inboard Engines & Outdrives
9 thunderbolt V ignition Mercruiser I/O & Inboard Engines & Outdrives
0 1998 Mercruiser alfa one, Thunderbolt Ign 5. Will not fire Bayliner Boats
3 HELP - How do I find out what year my Thunderbolt 850 is? Mercury & Mariner Outboards
3 mid '70's thunderbolt tach connection question Mercury & Mariner Outboards
7 Mercury 500 Thunderbolt question Mercury & Mariner Outboards
6 1997 Mercruiser 5.7 Thunderbolt V Ignition cuts out for a split second while cruising Mercruiser I/O & Inboard Engines & Outdrives
8 old mercury thunderbolt MERC 300 motor? Non-Repair Outboard Discussions
15 Please Help 7.5 hp mercury thunderbolt throttle assembly / inside of lower unit Mercury & Mariner Outboards
2 1997 Mercruiser 5.7 Thunderbolt V Ignition cuts out for a split second while cruising Mercruiser I/O & Inboard Engines & Outdrives
9 Mercury 1150 thunderbolt questions Mercury & Mariner Outboards
3 Do i have the only thunderbolt in existence?? Thunderbolt
0 '77 Merc Thunderbolt 500 kinda missing at high RPM Mercury & Mariner Outboards
8 Need Help With a 1976 Mercury 500 Thunderbolt 50hp OB.... Mercury & Mariner Outboards
5 Testing ignition system - 1980 Merc Inline 6 Thunderbolt Ignition Mercury & Mariner Outboards
0 1972 4 hp thunderbolt carb idle screw setting amount Mercury & Mariner Outboards
1 merc 500 thunderbolt 50hp Mercury & Mariner Outboards
5 thunderbolt V to marine msd Electrical, Electronics, Audio and Trolling Motors
4 Thunderbolt Tach issues Mercury & Mariner Outboards
7 Help with a 50 hp mercury thunderbolt Mercury & Mariner Outboards
2 Merc Thunderbolt not firing on all cylinders... Mercury & Mariner Outboards
1 1100 SS 110 thunderbolt will run choked but hard time idling Mercury & Mariner Outboards
5 1971 mercury thunderbolt 650 fuel problem? Mercury & Mariner Outboards
1 Mercruiser 7.4 thunderbolt parts ? Mercruiser I/O & Inboard Engines & Outdrives
0 Mer 9.9 thunderbolt does not start Mercury & Mariner Outboards
3 1970 mercury thunderbolt 65 hp outboard Mercury & Mariner Outboards
0 please help me i.d this motor.50 hp. thunderbolt ignition, 9050196 w/pump Mercury & Mariner Outboards
2 bent pushrod mercruiser 7.4 thunderbolt Mercruiser I/O & Inboard Engines & Outdrives
5 Thunderbolt 4 ignition problem Mercruiser I/O & Inboard Engines & Outdrives
18 1976 Mercury 650 Thunderbolt Stalling Mercury & Mariner Outboards
1 Thunderbolt timing.. Need to order quick. Mercruiser I/O & Inboard Engines & Outdrives
2 68' Merc 650 thunderbolt issues Mercury & Mariner Outboards
17 850 thunderbolt Mercury & Mariner Outboards
1 Parts for 5.7L Thunderbolt (on exhaust elbow) Mercruiser Tune-up Mercruiser I/O & Inboard Engines & Outdrives
4 Tach wiring for a '67 Thunderbolt 500? Mercury & Mariner Outboards
0 60s model merc 500 thunderbolt crack carb jet Mercury & Mariner Outboards
4 Mercruiser MCM 5.7L V8/350 Thunderbolt IV Killing Ignition Coils!!!! Mercruiser I/O & Inboard Engines & Outdrives
15 Thunderbolt IV ignition HELP!!!! Mercruiser I/O & Inboard Engines & Outdrives
4 1970 Mercury 800 Thunderbolt water pump question? Mercury & Mariner Outboards
1 1983 7.5 hp Mercury short shaft outboard with thunderbolt ignition. Fuel ratio? Mercury & Mariner Outboards
1 Mercury 500 Thunderbolt 1973 50 hp - Starts, Idles Great, Dies when put in gear Mercury & Mariner Outboards
3 Year of my 50hp Merc thunderbolt Pls Mercury & Mariner Outboards
4 73-74 mercury outboard 850 thunderbolt 85 hp. No Spark Mercury & Mariner Outboards
0 74 thunderbolt 1500 switch wiring problems Mercury & Mariner Outboards
3 Old Merc 1000 Thunderbolt- No Spark, Please help Mercury & Mariner Outboards
7 1977 mercury outboard 1150 thunderbolt no spark Mercury & Mariner Outboards
6 1971 Mercury 650 Thunderbolt Ignition Mercury & Mariner Outboards
0 merc 9.8 thunderbolt exhaust thru tel-tale Mercury & Mariner Outboards
11 mercury 115hp 1150 thunderbolt 1977 water flooded Mercury & Mariner Outboards
4 1977 mercury outboard 1150 thunderbolt no spark Mercury & Mariner Outboards
2 problems with a thunderbolt 40hp elec start outboard Mercury & Mariner Outboards
1 1967 MERC 500 thunderbolt 50 hp four with no spark Mercury & Mariner Outboards
0 merc 650 thunderbolt, Can't keep running Mercury & Mariner Outboards
0 I'looking for a 650 mercury Thunderbolt Mercury & Mariner Outboards
5 '71 Thunderbolt 650 (65 horse) crapped out Mercury & Mariner Outboards
3 Used 5.7 Mercrusier Thunderbolt 250... Non-Repair I/O and Inboards
2 mercury thunderbolt 500 Mercury & Mariner Outboards
6 1971 Mercury 650 Thunderbolt Alternator problem? Mercury & Mariner Outboards
3 thunderbolt 500 leg Mercury & Mariner Outboards
3 Model 850 Thunderbolt Year I.D. Mercury & Mariner Outboards
4 mercury 500 50hp thunderbolt ing. outboard ser#1771598,,anyone have any info on this? Mercury & Mariner Outboards
0 Mercury Thunderbolt 650 - NO SPARK Mercury & Mariner Outboards
14 1974 1150 Thunderbolt bogs out Mercury & Mariner Outboards
0 1979 500 thunderbolt runs great for a while Mercury & Mariner Outboards
0 Thunderbolt type II ignition Mercury & Mariner Outboards
5 Mercury 1500 thunderbolt 150 hp ignition. Mercury & Mariner Outboards
7 1967 Mercury 650 Thunderbolt Ignition - Tachometer help needed Mercury & Mariner Outboards
3 question about a mercury 1500 thunderbolt Mercury & Mariner Outboards
0 1982 merc thunderbolt 80hp Mercury & Mariner Outboards
4 85hp mercuy thunderbolt stuck in fwd Mercury & Mariner Outboards
3 Does anyone know the HP and prop pitch for 1992 chaparral 2550 sx 7.4 thunderbolt Prop Questions and Topics
0 9.8 110 thunderbolt Mercury & Mariner Outboards
0 89 Mercruiser 4.3 Thunderbolt Temp Gage Not reading Mercruiser I/O & Inboard Engines & Outdrives
0 89 Mercruiser 4.3 Thunderbolt Temp Gage Not reading Electrical, Electronics, Audio and Trolling Motors
5 thunderbolt 500 staling Mercury & Mariner Outboards
1 1971 Merc 500 thunderbolt, How do i adjust the mixture on the carbys ? Mercury & Mariner Outboards
0 1975 ish 7.5hp Mercury Thunderbolt choke valve shutter question Mercury & Mariner Outboards
0 1972 Mercury 650 Thunderbolt Ig. wont start. Mercury & Mariner Outboards
1 1973 merc 1150 thunderbolt rectifier problem? Mercury & Mariner Outboards
3 1975 Mercury 850 85 hp Thunderbolt Mercury & Mariner Outboards
7 thunderbolt trigger theory and operation Mercury & Mariner Outboards
14 Merc thunderbolt 400 40hp 1970 Bad Powerhead??? Help! Mercury & Mariner Outboards
0 mercury thunderbolt 200 20 hp 4958734 Mercury & Mariner Outboards
7 135 Merc Thunderbolt Low idle Low RPM Mercury & Mariner Outboards
7 1978 Mercury 70hp 700 series thunderbolt Mercury & Mariner Outboards
4 Mercury 65hp Thunderbolt Ignition... General Questions... Thankyou Mercury & Mariner Outboards
1 1981 mercury thunderbolt Boat Topics and Questions (not engine topics)
1 1981 mercury thunderbolt Mercury & Mariner Outboards
17 thunderbolt 500 Mercury & Mariner Outboards
3 50 thunderbolt year?? Mercury & Mariner Outboards
7 1973 merc 1150 thunderbolt Tilt and trim motor Mercury & Mariner Outboards
5 Thunderbolt Ignition 9.8 Mercury & Mariner Outboards
3 No drive only reverse o/b 115 thunderbolt Mercury & Mariner Outboards
1 Wiring for a thunderbolt ignition retrofit Mercruiser I/O & Inboard Engines & Outdrives
4 1969-1972 mercury thunderbolt 800 80 hp ouboard troubles!! Mercury & Mariner Outboards
19 '78 thunderbolt 700 falling on its face Mercury & Mariner Outboards
5 71 Thunderbolt 800 Tilt & Trim rewire Question Mercury & Mariner Outboards
5 Mercruiser MCM 5.7L V8/350 Thunderbolt IV Will not start after Tune-Up Mercruiser I/O & Inboard Engines & Outdrives
3 Mercury 7.5 with Thunderbolt ignition question Mercury & Mariner Outboards
8 Mercury 500 Thunderbolt 1970 50 hp gear case NO OIL Mercury & Mariner Outboards
7 Dumb Question..2004 Mercruiser 5.0 Thunderbolt..new to me engine...best way to start? Non-Repair I/O and Inboards
5 Installing an ignition sensor on a thunderbolt IV carb motor Mercruiser I/O & Inboard Engines & Outdrives
9 mercury 110 9.8hp thunderbolt fuel problems ?? Mercury & Mariner Outboards
14 Thunderbolt IV timing advance... Mercruiser I/O & Inboard Engines & Outdrives
3 Merc 200 Thunderbolt/Super Hurricane Serial Problem? Mercury & Mariner Outboards
0 50hp Thunderbolt Mercury & Mariner Outboards
1 merc 85hp 850 thunderbolt distributor problems Mercury & Mariner Outboards
1 1979 40 hp Mercury thunderbolt Mercury & Mariner Outboards