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Honda MX & Off-Road Dirt Bikes
Rejetting the 2001 CR250
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[QUOTE="Bent6, post: 907079, member: 19347"] Do you know the current jetting? I would be surprised if the previous owners didn't rejet it because the 01 CR250 was unrideable from the factory. The bike was jetted way-way-way too rich especially in the midrange. My bike has run great since I put in S-7 needle jet from a Yamaha. Below are some posts from the CR250 yahoo groups (egroups.com) Hope this helps. You will fix all your headaches with a $14 part. The bottom post is the set up I'm running. I found the jetting that you seen to be my final setting. I could of sent my carb slide to FMF to cut. but I was sure if that would of curd my problem. Later I found that the S-7 Nozzle would do the same as if I had the carb slide cut. My bike ran great, it was all stock other than the carb jetting. All i know about my 2001 Cr 250, is that i had to put the s-7 nozzle in the carb. This is a Yamaha part number 3tc14141-57. Without it, it fouled plugs and ran to rich. I also changed the needle to a leaner one and did a few other different than stock settings that i can not remember. I did all of the adjustments possible, and it still fouled plugs until i got the s-7 nozzle. I still have everything else stock performance wise, so i can not help you out. Mine runs great now. It ran like crap off of the showroom floor. I have a 2001 CR250 in SE Michigan 500 Feet above sea level. I tried many combinations. This is what I'm Currently running. 420 main 30 pilot H-75 needle on the 2nd notch from the top. But what made the biggest difference was the S-7 Nozzle. the nozzle is what the main jet screws into and the needle jet meters fuel through. Honda uses an S-9 stock and I don't think they have a part# for the S-7. But Yamaha uses the same carb. If your interested I will get you the part #. But try Honda first. The S-7 nozzle cost about $14. There's four of us here that have 01 CR250's and we all run S-7's besides one buddy, he runs an S-4 because he uses race fuel. [/QUOTE]
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Honda MX & Off-Road Dirt Bikes
Rejetting the 2001 CR250
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