Quote:
Originally Posted by crackerjac
Question, what's the best mods to make with these 167FMM motors?
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A ported and shaved head, larger carb (A true 30mm smooth bore), and a good free flowing exhaust will give the most bang for the buck on most of these motors. Instead shaving the head, if you want to get into more advanced motor building you could deck the cylinder to get the quench down to a .035 range for the "best" high compression build, but to achieve this you have to take quite a bit from the top of the jug, which can then result in having a REALLY high compression ratio, so a dished piston would be needed to bring it back down to a reasonable level.
You won't really find a "big bore" kit for these motors anymore as most companies found the gains to be minimal and the cylinder started having trouble with cooling. This is why CCW stopped carrying their big bore kits. In their own words, the gains were minimal and not worth the cost. Spending hundreds of dollars to gain 19cc and no real discernible difference in power or torque. Considering those guys managed to squeeze 23 wheel HP out of a CG250, I will take their word on it.