Posted November 28, 201212 yr Halo I got yamaha tzr125rr beldarda wanna know how do I sett the powervalve to open more and make the bike faster plzzzzz
December 5, 201212 yr If the power valve system is set up there isn't much that can be done. Opening the valve further won't make the bike faster. It will restrict it as the valve will turn more and the back of the valve will start blocking the exhaust port. What kind of speed are you getting from the bike?
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