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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
quick help please, jetting a 2001 CR250
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[QUOTE="James, post: 1323283, member: 27207"] To get carb out of frame: 1. Loosen carb-intake and carb-airbox bands 2. Rotate top of carb towards you on left side of bike 3. Remove two screws on carb lid and pull it off along with pulling slide out of carb. 4. Retract spring and retainer ring and manuever throttle cable out of carb slide to get to 6mm bolt that secures needle 5. Rotate top of carb away from you to access float bowl, main, pilot, and nozzle. 6. If you want it "out" from here, you can wrestle it out of the intake/airbox boots or raise/remove the subframe. Sounds like stock jetting and you probably have the 35 pilot. The 400 you mention is the main and the S9 is the nozzle. The air screw is the tiny brass colored screw to the lower rear of the one with the locknut. The one with the locknut is the idle adjust. For the temps you mention, my guess is the bike is too lean. You would need to adjust the idle screw and change pilots to get rid of that low-mid bog. I wouldn't be surprised if the bike ran better with the needle raised one notch and a 410 or bigger main at 30 degrees. I know my bike required some big changes last time I rode in weather any where near that cold. I doubt a plug chop will be helpful on your low-mid jetting. Be careful about running WOT to plug chop in 30 degree weather unless you KNOW your main jet is big enough. You don't want to seize the engine. For normal temps 70-90 degrees, I think I generally have a 32.5 pilot, 390/400 main, needle 2nd/3rd clip, and a S-7 nozzle. [/QUOTE]
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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
quick help please, jetting a 2001 CR250
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