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Discussion Starter · #1 ·

I just bought a 2002 ZR 440 sno pro. It has good compression, clean carbs, and new plugs but it won't rev above 6500 rpm and i think it might have something to do with the power valves. The servo motor for the power valves acts real weird. It'll spin both directions almost a whole revolution randomly like it has no idea what its doing. What controls that servo motor and telling it when to open and close? Any other ideas would be appreciated!! Power valves are also clean.

Thanks again,
Joe, WI
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