glb302 Posted September 27, 2005 Just bought a slightly used '05 crf450 that "pops" right off idle. I wouldn't describe it as a full backfire. Is it lean or rich? I'm in florida where it is about 90. As far as i know the jetting is stock but has fingertip pilot adj. Thanks for any help. It runs great other than that though. Share this post Link to post Share on other sites
FPMX_74 Posted September 27, 2005 popping is a lean condition. Try coming out on the fuel screw a little. check with burned on the jetting forum though. I am no expert.. also, check your rubber intake boot and exhaust for leaks. both of these can cause popping/lean.. you might check the carb. it might need a cleaning. the pilot could be a bit clogged. that was the case with mine.. pilot clogged, popping on decel and would not idle.. Share this post Link to post Share on other sites
Baron Von Beard Posted September 27, 2005 popping is a lean condition. Try coming out on the fuel screw a little. check with burned on the jetting forum though. I am no expert.. also, check your rubber intake boot and exhaust for leaks. both of these can cause popping/lean.. you might check the carb. it might need a cleaning. the pilot could be a bit clogged. that was the case with mine.. pilot clogged, popping on decel and would not idle.. Ditto. Post a thread on the jetting forum for Burned. He's the man. Share this post Link to post Share on other sites
