Re: k&n filter
Get a set of jet drills from Harbor Freight. Or get a set of torch tip cleaners from like Sears, about 6 bucks. Go up one size at a time, till it runs good. It helps to read the plug after a wide open throttle sprint, then kill the ignition before you lift off the throttle. Get the shifter to neutral as soon as posible. Then coast to stop, pull the plug after a short cooldown. The white insulater should be a tan color. If its white, its lean, and needs to be bigger. Or go to a Yamaha bike shop, and ask them for a Makuni carb jet, larger than the one you have.
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