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    OMC 120HP suddenly backfiring when accelerating

    Hello all, My 1980 OMC 2.5L (120HP), Rochester 2GC carb has recently developed a backfiring issue. I was out on the lake cruising when it suddenly lost RPM and started backfiring through the carb when trying to give it throttle. I've since replaced the distributor cap, rotor, points &...
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    OMC 400 upper gearcase bearing race spun

    Hey all, I'm working on rebuilding the upper gearcase on my 1980 OMC 400 stringer drive. When attempting to shim the ball gear shaft, I found out that the bearing race for the opposite end of the ball gear shaft, deep in the housing, has spun in its place. I was able to pull the race out by...
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    OMC Stringer 2.5L front mount height setup

    Finally got my engine reinstalled after replacing my stringers, deck and motor mount beds. I did my best to make sure the mounts were all at the same height as previously, but in case of any error I'm trying to figure out how this front motor mount is supposed to be setup. It's a manual trim...
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    OMC 2.5L milky oil after short time

    Well... this is painful. I recently picked up for $200 a 16' 1980 SeaSwirl with an OMC 400 stringer drive, 2.5L 120HP engine. All the wooden motor mounts/stringers/etc were rotten out, I have another thread talking about repairing all of that. (Should've quit while I was ahead and not started...
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    Stern drive/inboard engine - sealing transom ring

    I've just installed a new transom core in my old Seaswirl, which has an OMC 400 stern drive in it. I've been doing lots of research and haven't come to anything conclusive. The seal ring has some 20-odd screws that attach it to the transom - I'm trying to figure out how to seal up all those...
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    1981 Seaswirl 16' stringer repair

    I recently picked up this POS for $200, not realizing how much work it would be to get it up and going. Motor mount beds and stringers are all totally rotted out - to this point I've pulled out all the rot, built new stringers & mounts and have started tabbing it in. The boat has two foam-filled...
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