'14 YZ450F with WR 4th/5th - top speed?

3 replies to this topic
  • GHILL28

Posted May 16, 2016 - 08:42 AM


Anyone know what the difference in top speed would be with stock 13/49 gearing in a '14+ YZF with a stock 5th gear vs a WR 5th gear?

  • grayracer513

Posted May 16, 2016 - 09:40 AM


At 10K in 5th, no allowance for tire slip, rolling diameter not adjusted, the YZ450 5th yields 84.41 mph, and the WR 5th yields 95.67 mph.  That's 8.44 MPH/1000rpm vs. 9.57 MPH/1000rpm.

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  • Conner_Steezel

Posted May 16, 2016 - 11:05 AM


Gray racer what is the top speed on yzf with 14/48 gearing

  • grayracer513

Posted May 16, 2016 - 12:03 PM


Gray racer what is the top speed on yzf with 14/48 gearing


(Engine RPM / (primary drive ratio x 5th gear ratio x final drive ratio)) x wheel circumference (miles) x 60









92.8 MPH  (assuming you meant a YZ450F)

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