modifying stock cylinders and pistins

kenny s /
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Besides widening the intake and exhaust port a millimeter or 2, what other modifications do moped mechanics like to do for speed? Did anyone ever drill their own auxiliary port? boost port? or overflow channel? I really hate adjusting timing. Can i do some of these modifications without adjusting timing? I want to keep my 39mm piston and just learn to modify the cylinder and piston.

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