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Im working on a trackster I recently bought and the last owner installed an electric auto fuel pump. It smokes bad and doesn't want to run right. Im thinking its to much pressure and may have caused some damage. Ive installed new points, cdi box, spark plugs and air filter and am looking at rebuilding the carb and a new set of piston rings. It does run ok at a higher rpm but doesn't want to idle. Any ideas anyone? Ive fount stock replacement ones for like $90.
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An electric fuel pump should work fine. If it won't idle, but runs ok at higher RPM's, you might have a vacumn leak. Your carb base gasket might not be sealing, crank seals could be bad, leaking jug base gaskets, a bad reed valve. With the engine running and trying to idle, cup your hand over the carb intake, if the engine speeds up, you have an air leak somewhere. Check the compression , weak cylinders can cause idling issues too.
This is just my opinion, but I wouldn't put to much money into rebuilding an original OMC engine, at their best, they don't run as good as a poor running 4 cycle conversion. They are underpowered, noisey, smokey, and not very reliable. I'll probably get some disagreement on this, but I've had both, and after having Tracksters with an 18-23 HP Briggs or Honda in it, I'll never mess with another 2 cycle again. So unless you are restoring it as an original and don't plan on using it much, convert it to a 4 cycle. Not dishing your machine, just speaking from experiance.
Coop -
To each there own. Not that I don't want a 4 stroke in it, I just love 2 strokes. Light weight, simple, and love the smell of a good 2 stroke. If it comes down to it then I will toss in a 4 stroke. But not until this one is dead. I also don't want to cut the engine cover. Thanks for the info. I will check the basics first then go from there. This isn't going to get a lot of use, just some here and there. I plan on restoring it one day in the near future so I would like to keep it as original as possible.Comment
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I understand, no offence intended, I was just throwing my opinion out there as food for thought. Good luck with the project.
CoopComment
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A automotive electric fuel pump will want to push 8 to 11lbs, a pulse fuel pump is 2 to 3. i would bottle feed with another tank and let it siphon feed and see if it doesn't clear up.
cheap N easy to eliminate it
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Anyone do an engine swap and not cut the cover?Comment
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I've installed a 23 HP Briggs in a Trackster for a friend w/o having to cut the cover. I only had to slightly modify the hydro control rods to clear the top of the engine.
CoopComment
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I had similar problems with mine. I would also suggest closing the gaps up on the plugs. The book says .040" but i don't think the old electrical systems can hack that. Im running mine at .020" and it made a huge difference in idle. I would also pull the mufflers and check them. I had one with a broken baffle that was blocking it. I cleared. It and that made a big change. Lastly i had an old sled specialist rebuild the carb, i already did it but i guess they are called specialists for a reason and it changed it completely.
So it is running ok now. I have to second Coop's opinion though, as soon as feasible this engine is leaving it's current location and being replaced with a honda GX670 that i have waiting to go in. That motor is awfully finicky and i don't want a project i just want to ride.
NickComment
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