i am havin trouble on my power valves when i am riding because at 6 thousand rpm the engine seems to start spluttering and not running wild with its self in the power valves can n e 1 help me fix my ltlle nsr back to the roaring version that is was when i first baught it a year and a half ago
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rEv AnD RIp oN tHoSE pOWeR BanDS