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YZ125 1987 power valve what is it?

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ok i know that i may sound dump but how else will i find out then to ask! i have a 87 YZ125 the power valve broke on it but it cast 150 bucks so do i really need to replace it and what the heck does it do? thanks for all the help anyone can give! ! ! :)

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You're in the Suzuki forum.... :)

The "power valve" is really an exhaust valve. It is generally adjustable to open/close to provide back-pressure in the exhaust for more torque or a harder power hit.

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