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What's the best parts to put on a 69727 non hemi 212cc with the rtc-9 head? I ride a 2-speed auto motorized bike that currently tops out around 55mph. The engine currently has a 19mm slide carb, 4* adv timing, removed governor, removed fan and shroud and set up as a rope start, and now has a...

What's the strongest engine for use with forced induction? around 200cc and less. ie.. Can a smaller GX160 handle more compression than a bigger 200? What about flatheads? I would like to smog pump supercharge an engine for my next project and am wondering what motor to start with. I'll...

Ordered a Max Torque clutch, 5/8" bore 10t #41 chain. Got a clutch with such specs, except it's a china knockoff. It is all black, instead of having a keyway slot it has an imprecise cast-in key, and no set screws anywhere. Also, there does not appear to be a bronze bushing in the middle as a...

My 3.5hp 91232 has a bad flywheel side bearing. The runout is like .020" or more. I can't adjust the magneto gap because the flywheel literally sticks to it when I turn it. There is this 93400 Shortblock I can buy to swap the parts off my 91200 to. The crank on mine ends at the flywheel threads...

Hello, I've just finished this bike build. You can see the build thread here: (won't let me post the link to a popular engine kit forum.. username beginner01... weak....) Funny thing is, most times I search on google for an engine/driveline answer, I end up lurking here. :thumbsup...

Hello, I've been reading threads here found from google searches when the motorized bike forums never gave me the answers I needed... finally signed up. Thank you for this forum!! It's already helped me a lot, and I hope to give back what I can. CNC lathe guy by trade, engr student in the...