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Message: [QUOTE="D Lafleur, post: 1239894, member: 27020"] Very close in your thinking. The powervalve, helps to shape the power curve, by varying the VE of the engine as RPM is increased. It is a tuning device, similar results to VVT in 4 stroke engines. Now if I could just figure out why my RM 250s do it so much better than my other bikes, I would be happy. I have accepted the fact it is due to the "yellow Powerband" that Suzuki puts in it at the factory. :) [/QUOTE]