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Honda MX & Off-Road Dirt Bikes
02’CR250 baseline jetting tips needed
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[QUOTE="Sandy Whoops, post: 797840, member: 47365"] At sea level, the '02 is a little fat in the bottom and lean on top. Complicating the issue is a lean spot at 1/4 throttle that can result in detonation. Below are my current sea level / summer settings, which have been used up to about 1500'. Aside from a FMF TCII, the engine is stock. Main - 400 (stock is 380) Needle - 6BEY30-74 (stock) Clip - 2nd or 3rd from top Nozzle - S8 (stock is S9) Pilot - 30 (stock is 32.5) AS - adjusted per conditions, but about 2 turns out At 1500' , the 400 main is a bit too fat. A 390 would be better. I tried the S8 nozzle only after buying and testing a bunch of jets and needles. In retrospect, it's probably better to start with the S8 nozzle and jet to it. Not sure how the Radvalve affects your carb. But I'd suggest you order an S8 (from Yamaha), a 390 main, a 30 pilot, and a 6BEY30-75. Look for crisp throttle response, no detonation at low RPMs @ 1/4 throttle, and overrev that won't quit. Tip: the clip position has a considerable impact on overrev - experiment. [/QUOTE]
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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
02’CR250 baseline jetting tips needed
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