Rebuilding a 350cc

Madman415

I have never had to rebuild a 350cc before but my 14yo engine started blowing out white smoke and has a horrible internal rattling... does this weird pulsating vibrating business.. lol but anyway, I'm thinking about rebuilding it rather then swapping it. It's been such a good engine, dealing with extreme abuse.

Question:
Are there rod bearings in these engines? (I don't see any in kits)
Does the Crank usually need to be replaced?
Is putting a 295cc head on it a good or bad idea?

everyones input, good or bad will be very usefull on this matter...
It's going to be either rebuild this engine, swap it with another 350cc I have, or modify it for the Turbo Diesel

BGW

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ez go go

There are no bearings. The connecting rod is your bearing.
Most times the crank is reuseable, unless it is grooved to bad or it has been damaged due to connecting rod failure.
Yes, the 295 head to 350 block is a great idea if you like a little more low end. I have the setup on my txt and love it. Hope this helps ya.

worqhors

Unlike the Yamahas, the 350 ezgo has no bearing between the conrod and crankshaft. If you want to rebuild it, go for a .50 OS pistons. Replace all seals. Consider replacing all valves. And yes, replace the crankshaft bearings (those at both ends).

Subarumouse

Hallo Madman,

There are no original bearings, but a cartracing / engineshop shop can build them in.
It will last longer and if higher revs, it's the only way to go!
With a 295 head you get higher compression, so more power on the cranck and more wear......
All 350 engines in racecarts have them build in afterwards.

Benno

Madman415

wow, thanks everyone for reply to this post so fast. Sounds like putting the 295cc head is what I'm gonna do and I had planned on going with .50 over on the pistons. I won't be looking for higher rpm's, I just want it to have more power from a dead stop. I've always had issues with taking off for the first 2ft. Once this cart moves 2ft it'll pull almost anything I hook to it... Until yesterday anyway.

so with the 295cc head on the 350cc, already have the 28 degree driven clutch, have the drive clutch turned one position counterclockwise, and will install the .50 over pistons, rings, & new rods. Does that about cover it for solving the launching power problem?

turning the drive clutch helped alot... it now revs up to 2,000rpm before it moves rather then 1200rpm. The torque curve is between 3,000-4,400rpm. I say this because watching the tach, at that range it pulls like a som-bi*#h.

Has anyone here put a "Supercharger" on their cart? Was just wondering if it's worth the $2,000.