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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
YZF267 v. YZF290
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[QUOTE="Pete Payne, post: 146108, member: 20445"] Yes , Steve and I did a lot of testing on the 250F. I feel that the MR2 fuel was the best improvement. It gave us an increase in performance no matter what combo of parts were on it. No need to worry about mismatched parts combinations or super loud exhaust systems ,the DSP full race exh gave a good increase, but is super loud, I think this is a bad trade off. If they phase out 2-strokes and the noise level of the 4-stroke stay up to keep the HP level up, a lot more practice tracks will be closed down due to neighbors complaining about the noise. The carbon fiber air box also proved to be a bad choice. The stock air box out performed it on the Dyno. Willie at DSP took the air box back , but could not believe we did not get an increase. He wanted us to try it on the track, and assured us we would like it due to the assumed increase in throttle response, but at$500.00 Steve did not want to chance not being able to return it. I to do believe that a 2mm overbore, NICASIL cylinder , will be a good choice as far as bang for your buck and a solid increase in performance. Steve can comment more on track performance.He is an excellent test rider and notices very small changes. [/QUOTE]
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Forums
Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
YZF267 v. YZF290
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