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250x review

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That is a great review. This is the first review I've read with specifics about the power valve operation. He mentions the opening range has been increased from 500 RPM to 1500 RPM, but does not cite a source for this information. I have not seen such specifics published anywhere. Yamaha has not released anything that I am aware of in this regard. Maybe they measured it themselves? 

 

The increased opening RPM range seems consistent with the heavier spring and testing folks here on TT have done so far.

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What's a power valve ramp shape?

Is it like the cut on the carburetor slide?

 

If so, I've already cut my own slide.

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I think they miss spoke. The ramps are the same parts as the MX. I think they meant that the main valve itself is shaped different. What some call the ramps are the two small pieces that mount to the shaft that drive the 2 wing valves.

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