Reed spacers and boost bootles are tuning aids, not power increasers. a motor is an air pump. to make the most power, get it to pass the most air. you can open up the intake all you want, but if the cylinder and exhaust dont match, same with the exhaust, same with the port specs. most bang for the buck... foam filter, toss the airbox lid, deck the head .020, clean the casting flash on the cylinder CAREFULLY, and decent exhaust and silencer.