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Message: [QUOTE="cr250brider, post: 1397075, member: 119870"] OK, I bought a 99 cr250 carb , brand new pwk 38mm keihin. I put it on and wow, this bike runs pretty good, very clean and smooth. we rode it for about 15minutes and bam, it happened again. it started to run stupid again. So I let it cool off and I changed the needle position from the 3rd down to the 4th down. I started it and It ran beautiful for about 15minutes and it started again. this thing runs beautiful and then it starts running like it is running out of fuel, real lean. I dont know what to do but sell. any one interested in my rebuilt 250? [/QUOTE]