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Fs: Yamaha Orig Big Valve Head 20/22


Super Veteran
Nope, big valves should be used to 60mm and up bore system..the size of this head valve is perfectly matched to a 62mm bore, in return you will get gas efficiency, improved top speed, fast response.

don't get mislead to information using a vixion kit matching to a big valve head that will turn your mc to a mamaw..