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  1. K

    5.0LX surging/stumbling

    Lou, Thank You for your input. Do you know of any link to a detailed video on rebuilding a Quadrajet correctly? Also, I need an idle mixture adjusting tool (which I'll use only one time) Do you think this double D fitting is the correct one in this Amazon link...
  2. K

    5.0LX surging/stumbling

    Scott06 - Thank YOU for your thorough reply. GM 305 CID (5.0LX) 4-bbl 230HP has run perfect since 1988. I have new (genuine Mercruiser) distributor cap, rotor, plug wires and AC Delco spark plugs-(all carefully gaped). Engine ran awesome (as usual) with these new parts for 1 season, so firing...
  3. K

    5.0LX surging/stumbling

    Now that I'm home, I did quite a bit of research on "weak" coils and have learned that the coil is a possibility for faltering. I also occasionally have a back-fire through the carb as well, while cruising at 3,000 RPM. I store my old 1989 boat out of state and only use it a few times a year. I...
  4. K

    5.0LX surging/stumbling

    Too hard to test with spark gap tester because it only acts-up while in gear and accelerating or cruising. I'm going to replace the ignition coil first (since it's an easy quick swap). If that doesn't cure it, I'll rebuild the carb
  5. K

    5.0LX surging/stumbling

    5.0LX 230HP 4bbl Rochester carb recently started stumbling, then surging (or running normal). Starts normal, Idles fine. Sometimes accelerates normal, sometimes not normal (less power). Sometimes runs normal at 3,000 rpm sometimes it falters. Doesn't feel like a spark plug misfire (not a hard...
  6. K

    5.0 LX hard starting when warm

    1989 5.0LX four barrel Rochester carb. After fully warm, no throttle advanced, engine cranks for maybe 10 seconds before gradually starting. Runs great after finally starting. It used to start much quicker. I will put a carb rebuild kit in but I don't think that will improve it since it runs...
  7. K

    1988 5.0L LX tune up parts needed

    I have a 1988 5.0L LX serial 0C394369. I have it stored out of state so I can't check to see. Does it have ignition points? It's hard starting when hot so replacing: - Distributor Cap and rotor - Is Sierra good or is genuine Mercruiser cap & rotor best? - spark plugs (AC Delco MR44T ok?) or...
  8. K

    4 year old pre-mixed gas OK to run in 1977 Merc 175HP

    Is it OK to run 4 year old pre-mixed gas in 1977 Mercury 175HP. About 3 gallons left in tank. Fuel was originally stabilized before storing.
  9. K

    Old Merc V6 poppet question

    1977 Merc 175 HP serial 4733877 - Cooling system relief valve. I have a "design I" Poppet Valve. The popper valve contacts the rubber grommet (in the recessed hole in the block) slightly before the plate/cover contacts the block, so when I tighten the plate/cover bolts there is some "spring...
  10. K

    Old Merc V6 poppet question

    1977 Merc 175 HP serial 4733877 - Cooling system relief valve. I have a "design I" Poppet Valve. The popper valve contacts the rubber grommet (in the recessed hole in the block) slightly BEFORE the plate/cover contacts the block, so when I tighten the plate/cover bolts there is some "spring...
  11. K

    Old Merc V6 poppet question

    1977 Merc 175 HP serial 4733877 - Cooling system relief valve. I have a "design I" Poppet Valve. The popper valve contacts the rubber grommet (in the recessed hole in the block) slightly BEFORE the plate/cover contacts the block, so when I tighten the plate/cover bolts there is some "spring...
  12. K

    Poppet valve issue 1977 V6-175 HP serial 4733877

    poppet valve 1977 V6-175 HP serial 4733877 I bought a Merc Poppet kit # 8030 but the diaphragm & poppet valve were different than what my motor has in it. I replaced the gaskets, grommet, spring but did not have the correct diaphragm (or poppet valve) so I am wondering if I can use the...
  13. K

    Stator bad? 175 HP - 1979 Black Max

    I have a 1979 Mercury Black Max 175 HP V-6. Serial 4733877. It has run fine for years. Engine starts fine and idles fine but at throttle up, RPM increases a bit but just hangs at maybe 1,000 RPM. I got it past the "dead spot" once and when "over the hump" it ran up to full RPM, but after...
  14. K

    '77 - 175 HP V-6 Black Max slow acceleration

    My fishing boat sat for 3 years, (my fishing buddy died and I lost interest for a while but I'm baaack!) It ran great when I stored it. It was stored properly with fogged cylinders and crankcase, fuel stabilizer-refreshed every year and pumped into the carbs twice/yr, etc. I started with fresh...
  15. K

    fuel pump blown?

    1977 Merc Balck Max 175 HP<br />I forgot to open my gas tank vent. Motor ran great for 10 minuted then starved for fuel and stalled. I opened tank vent to relieve much suction. Re-primed bulb. Motor never ran right after that. rough running, can't get over 2,000 rpm. Breifly it ran good for...
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