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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: 1323336, member: 27207"] Check to see how the throttle cable is routed. I run mine outside the head stays on the left side. I have to remove the top to get to the bowl this way...but it alleviates the tightness which eventually breaks your outer cable sheath from turning the carb. You may have to take the throttle or tank and head stays off to remedy if the cable is routed up the middle. If its that cold, I would start with air screw at 1.5 turns, 35 pilot, needle in middle clip, and adjust your air screw in the direction that seems to improve until you reach one turn out one way or three turns out the other way. If you reach 1 turn you need a bigger pilot and 3 turns out means smaller pilot. I have a hard time noticing air screw changes sometimes and it is often easier for me to just try a different pilot leaving the air screw set in the middle. Since 35 pilot was generally rich on those bike in normal temps, I don't think you will need to go bigger than 35 especially if you get the needle and main richened up but it is possible. I'd also keep a 32.5 on hand for slightly warmer temps. I like to start with the low circuits and work towards the main jet...just my preference. I think the main is "ok" at 400 to dial in low range as long as you dont run it wide open for any period of time but could put a 410/420 in there to be "safer." It's possible 400 is right or it could need a 430 or more...hard to say without riding it. If it feels like it is running tight at WOT, try a bigger main. If you keep going bigger on the main you will feel it change from tight to perfect to kind of rough until the point where it starts bogging the other way or loading up. Do this enough and you will get a feel for it. Even if you get the JD kit or a Keihin carb (always comes up) you will still have to know how to adjust them if your temp range is 30-90+ degrees. I have the answers to your fork fluid questions also but I want to check my book when I get home to be sure. I think it is 6.5 ounces in the inner chamber and 11-13.9 outer with standard being somewhere around 13. Not an idiot..we all learn somewhere. Took me a few broken cables, a seized engine, and some foul language to get it down to psuedo science. [/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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