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does anyone make powervalves cylinders for the z400? or any aftermarket cylinders for that matter?
 

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I don't recally seeing a thumper with a powervalve. Only 2 strokes. No valves on them. the PV makes a big difference in the low end on a zinger.

The closes you may find would be something like Yami's Exup exhaust system. A little flap that opens up at higher RPMs... closes at lower for more backpressure.
 

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Yeah- Powervalves are typically only used on 2-strokes.
 
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