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Originally Posted by LifanXpectRider
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Incorrect. That would only work with an OHC CB based engine variant. The Xpect is rocking a 196cc CG engine with Overhead valves and pushrods. Hopefully you have not purchased it yourself yet on the bad advice of somebody else.
To the OP
As others have stated, pretty much every mod the CG250 uses the CG200 can also use. The cam I have will work, the exhausts will work, etc. The CG250 and 200 actually make basically the same horsepower, but the 200 revs out better where the 250 falls on its face, but the 250 has a bit more torque in the low end.
You could also add a CG250 cylinder and piston, but as somebody else noted there are other variables at work than just the bore size. For one, the engine cases may need to be machined to accept the cylinder as the outer diameter of the sleeve is likely larger. This would require a full tear down of the engine to do so.
If it were me and power was my goal, the larger bore would be last on my list. Bang for the buck, a cam is actually the best option. The cam I have basically enhances the current power curve the motor already has. There are other cam options geared toward better mid range and top end power as well, but may require some minor machine work to the head valve pockets for valve overlap clearances. Combine a cam with a proper ported head and a freed up exhaust system and it will feel like a different bike.