Fireroad Express Posted July 28, 2010 Report Share Posted July 28, 2010 bike starts fine and idles well but when i take it for a warm up run it drops a cylinder with in half a mile when it comes up to operating temperature. anyone got any thoughts on this? Quote Link to comment Share on other sites More sharing options...
06specialedition Posted July 28, 2010 Report Share Posted July 28, 2010 Have you tried new plugs?? Mine was doing that and new plugs made it run perfect. Quote Link to comment Share on other sites More sharing options...
Fireroad Express Posted July 29, 2010 Author Report Share Posted July 29, 2010 i tried several sets of plugs so far. Quote Link to comment Share on other sites More sharing options...
matt1 Posted July 30, 2010 Report Share Posted July 30, 2010 (edited) Does it completely drop the cylinder or just at idle? I had a problem with dropping a cylinder at idle after a few minutes of riding once and it turned out to be a slide problem. The pin that aligns the slide in the bore would allow the slide to turn, after I hit a few bumps the slide would turn and drop the cylinder at idle. Edited July 30, 2010 by matt1 Quote Link to comment Share on other sites More sharing options...
Fireroad Express Posted July 30, 2010 Author Report Share Posted July 30, 2010 Does it completely drop the cylinder or just at idle? I had a problem with dropping a cylinder at idle after a few minutes of riding once and it turned out to be a slide problem. The pin that aligns the slide in the bore would allow the slide to turn, after I hit a few bumps the slide would turn and drop the cylinder at idle. the problem happens to mine when it heats up. i"ll go for a short warm up on a trail behind the house but when i take the bike down on the road and hold the throttle open and go through the gears thats when it drops the cylinder and starts to bog out. Quote Link to comment Share on other sites More sharing options...
pr0blumz Posted July 30, 2010 Report Share Posted July 30, 2010 Sounds like an electrical problem. Quote Link to comment Share on other sites More sharing options...
bigborebanshee Posted July 30, 2010 Report Share Posted July 30, 2010 Does it drop the same side? have you tried switching your spark plug wires? Swapping out reed cages? Or a leak crankcase leak down when its warmed up? I would put my money on an air leak,probably crank seal.I just rebuilt a CR250 that was doing the same thing.kept thinking it was the jetting. Quote Link to comment Share on other sites More sharing options...
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