Reply to thread

Message: [QUOTE="pro2k, post: 903590, member: 36481"] Ok I have a 2003 CR250 that I JUST rebuilt and broke in last weekend. I didn't change the jetting at all and everything is the same as it was before the rebuild. When I broke it in everything seemed fine but yesterday I took it out for some gnarly woods riding and it would have some issues down low on the throttle. When I was using the throttle and the bike was under a load it would run fine but when I let off the gas and was coasting in gear, clutch in, it would have a slight knocking sound and the engine would 'hang on' to a high idle. If I revved it up it would return to a normal idle. When I went in for a pit stop I turned in the air screw about 1/2 turn and that seemed to lower the idle and help slightly with the knocking but then I noticed when I was coasting in gear on flat asphalt road that it would surge, return to a coast, and then surge again. Everyone with me said the thing was smoking plenty when I was riding. Here is my jetting for about 900 feet and temp was 70. MJ 410 27.5 pilot jet (stock is 30) needle 6BEY30-74 3rd clip AS 2 turns out ( I then turned it to 1 1/2) What the heck is the problem?? Funny thing is these are the settings I used before the rebuild and it was all good. I did change the PJ from a 30 to a 27.5 awhile back and haven't been in the woods with it. Been on MX tracks since then where you don't see much of that circuit. Could there be an air leak somwhere? HELP!!!!! [/QUOTE]