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YPVS Modification - Bonus Exhaust Curve for RZ350

The below ypvs exhaust curve was stock on John's(USA) '86 Rz350 bike.
I'm not sure I've seen this curve in the past. The exhaust valves starts opening at 7.000rpm and are fully opened at 9.500rpm.

A few photos of John's RZ bike. 



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