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CG engines are vertical. Cylinder nearly up and down. Overhead valves with internal cam. They will be in 125cc and larger, up to 275-300cc.
Qmb engines will normally be on the fully automatic models and are usually horizontal with no provisions for clutch or transmission attachment. Over head cam. They run straight into a variator (CVT). They are sized from 50cc up to 175-200cc. Most of the larger size designations are false with "200cc" being actual 165cc which is a 125-150 with a big bore kit.
The cub type engines are overhead cam. They will be on many semiauto and automatics and are also adaptable for manual shifting. They are not usually in the larger sizes above 125-150cc but go as small as 50cc.
Its a crap shoot with ATV engines and from what I have read none of them are as fast in an ATV as they are in a bike or scooter.
I am sure there are exceptions, I just have not read about them.
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%90 of the Chinese motorbikes ever made are still on the road. The other %10 made it back home.
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