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    Prestolite static timing help needed.

    1990 L Drive 120hp. Cylinder #1 at TDC. Single hash mark on flywheel lines up with hash mark on the motor. Woohoo! Now on to timing.... I removed the throttle cable and checked it: -At idle the single hash mark on the flywheel lines up with the hash mark on the motor. Is this correct...
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    120 L-Drive tach is whack. What pole is it!?!?

    My tach is pegged at 6k with the motor off. With the motor running it fluctuates between 5k and 6k. I'm pretty certain the tach is bad. I tested the rectified per the manual and it checked out. Does anyone what pole it is and a good place to buy a replacement? thanks!
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    Finished rebuild. Starts and revs to the moon!!!

    So I finally got around to finishing my 120 L-Drive build (new crank, pistons...the works). I button her up and press the magic button and she fires to life. YES!!!!! And then begins to scream at high RPM's like there's no tomorrow. Turn the key off, nothing. Pull the wire from plug 1...
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    Helicoil head bolts... do the holes enter the cylinders?

    This is for a 90' 120 L-Drive.... I got 2 holes for the head than need to be helicoiled. One is an outer hole that empties into the exhaust area, so no issues with cleaning debris or getting shavings into the motor. The other hole is an inner hole and I'm unsure where it empties into. Can...
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    Where to get new con rods? 120 LDrive

    I've got a freshly bored block, fresh crank, new pistons, new bearings and gaskets but my rods have some light pitting on the big end. Where... oh where can I get new rods? Or can I let it slide? How will the pitting affect the new roller bearings over time? Lastly, my bearing cages appear...
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    How to ID a L-drive crank vs outboard

    I recently purchased a crank to use for the rebuild of my 1990 120hp L-Drive. How do I determine that this crank truly was built for the L-Drive motor and not the standard outboard? Anyone know the stroke of each? Also, can anyone advise if aftermarket cranks were ever available for Force...
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    Looking for 120 L-Drive pistons. .030" over

    If anyone happens to have 4 extras for sale or can point me in the direction of a reputable dealer I would appreciate it. Also, what is the consensus regarding comparable brands? I see that iboats sells Sierra brand, which I've never heard of before. Is that a quality piston or something to...
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    Outdrive vibration while using in motion... L-drive

    Last time out I noticed a pretty bad vibration when I raised the outdrive after getting the boat on plane. It was certainly not part of normal operation. Does anyone have any input as to what the culprit might be? I've got the motor out of the boat and would like to remedy this before...
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    120 L-drive crank. Can it be ground or where to buy a new one?

    I finally got around to tearing the motor down and all 4 cylinders are toast as are the crank journals for rods #1 and #2. They're galled and either need to be ground or I need a new crank. Does anyone know if it can be ground and if I can get oversize bearing pins? Or where I can get a new...
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    Force 120: 1989 outboard and 1990 LDrive heads interchangable?

    I believe they are, but maybe someone on here knows otherwise and can save me the hassle!?!? Anyone know? thank you!
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    Cylinder #4 is toast.... please help diagnose (w/ pics)

    1990 120hp L-Drive A few months back I was on the river. I just got the boat on plane and then 5 seconds later it lost power. The boat would run, but only at 1/3 - 1/2 power. I limped it back to the dock, took it home and let it sit until now. I started simple with a compression check...
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    When stator fails will there be visual indication?

    1990 120hp L drive I tested my two AC leads and neither registered anything on the OHM scale (should read 0.5 - 1.0) and the ground test failed too. I'm sure its shot, but is there any visual indications that would confirm it? I hate to drop the cash for a new stator only to find I made an...
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    Bolt size for flywheel removal? Force 120 L Drive Prestolite

    I've got a 3 prong puller, but I'm not sure what size bolts are required. Anyone happen to know?
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    1990 120 L Drive weak spark on #1 and #4

    Hello. I think I've found my issue.... cylinders #1 & #4 (top and bottom cylinders) are getting a very weak spark. Since #2 & #3 are getting a nice blue arc I'm doubting its the magneto. I've got a 90' 120 L Drive with the Prestolite ignition and I noticed there's 2 CD modules.... does one...
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    So I disconnected the battery cables while running.... damage control time.

    This a 1990 120 L-Drive Force. Not knowing this was an unregulated style power system I removed the battery cables from the running motor. Known fatalities are my stereo and apparently my power guage on the dash. The head unit went up in smoke and the volts now read at 16+ (with the key on...
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    1990 Force 120 L Drive... runs, but no power at WOT

    I just picked up this boat last week and the first 3 trips went without a hitch (except the batteries wouldn't charge). This week I replaced the two dead batteries with one Costco marine/RV battery and installed a new head unit and speakers. I headed to the river and boated for 30-40 miles...
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