Yamaha G1 engine rebuild
Can someone give me the major do's and donts of a rebuild. Curious about what needs to be oiled and things of that nature. Any tips are greatly appreciated.
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Re: Yamaha G1 engine rebuild
Most of the time you can bore the cylinder and put oversized piston in and it runs like new. Sometimes you have to get into the bottom end be careful about that. You can cut the head some to help compression, only so much or it gets into the chamber, to get more you have to mod the cylinder shorter iirc. 2 stroke is much simpler, just don't have any air leaks into the engine be careful about that.
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Re: Yamaha G1 engine rebuild
I like to be sure to add a little oil to the seal inner lip to avoid dry start wear, and to the bearings if they are cleaned and reused, or the replacements come dry.
Be sure to check the rod for up & down play. Some play side to side is normal. New cranks are available, but are likely 3rd-world. Stocker can almost always be rebuilt better, for $50 or so less. Cylinder sleeve is thick and can be bored quite a ways. Mine has a Yamaha Phazer piston for a 30cc up-size. |
Re: Yamaha G1 engine rebuild
What kind of rebuild are you referring to? Rebuilding the original engine or rebuilding the whole cart with a bigger clone engine?
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Re: Yamaha G1 engine rebuild
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Any ideas and tips would be appreciated |
Re: Yamaha G1 engine rebuild
I wouldn't shave the head. The trick was to use the thinner Yamaha motor cycle gasket, this will raise compression. You don't want to get too much compression as then the starter will have a hard time turning the motor over. The other trick is to put on 2 base gaskets, this will change port timing. Its old school but works well.
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I had the head cut .030 I think and ported the exhaust up just a hair. If you run double gaskets under the cylinder you have to raise the compression somehow. Comp is really low not sure you could cut enough to make the starter not work. You can't cut the head much anyway due to the chamber shape. However advancing the timing and all that I was able to top 30mph with an otherwise stock cart. Was able to jump another G1, that was fun. |
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