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Message: [QUOTE="RM_guy, post: 1476507, member: 20652"] The power valve basically raises and lowers the top height of the exhaust port. The higher the port, the quicker it gets into the top end power. There's a lot going for that to happen but if you turn the valve in, it will stay in the lower end of the power band longer and the valve will be delayed moving up which makes the transition into the top end smoother. It avoids the "hit" into the power band. It's easy to adjust so you can play with it. Depending on the bike you can turn it it in 1/8 to 1/4 turn increments. [/QUOTE]