bfa Posted August 19, 2010 Report Share Posted August 19, 2010 My '09 4RT will start easily from cold and most times after having run. Whether it is after warming up from a cold start or in the middle of a ride, it idles smoothly but when the revs pick up it misses and pops. We are at 3000 ft. elevation and the other day rode up to 8000 ft. I started it easily to move it just a short distance, shut it off and then it would not start except by bump starting and it ran very poorly at that. It is rideable but performs poorly. Any suggestions where to start looking? Thanks. Quote Link to comment Share on other sites More sharing options...
munch Posted August 19, 2010 Report Share Posted August 19, 2010 was it stone cold when you restarted? Quote Link to comment Share on other sites More sharing options...
bfa Posted August 19, 2010 Author Report Share Posted August 19, 2010 Cool but not stone cold. After I bump started it, I ran it for a bit, shut it down tried to start it again, same problem (x2). Quote Link to comment Share on other sites More sharing options...
munch Posted August 19, 2010 Report Share Posted August 19, 2010 if you did not let it warm up ,possibly fluffed the plug , does it rev ? black smoke? pop bang? does it clear when fully warm ? if its fully cold will it start and what does it do? Quote Link to comment Share on other sites More sharing options...
nzralphy Posted August 19, 2010 Report Share Posted August 19, 2010 Check (carefully) for high voltage leakage between the plug and coil.... you may have insulation breakdown and the plug isn't getting a spark. Quote Link to comment Share on other sites More sharing options...
bfa Posted August 20, 2010 Author Report Share Posted August 20, 2010 if you did not let it warm up ,possibly fluffed the plug , does it rev ? black smoke? pop bang? does it clear when fully warm ? if its fully cold will it start and what does it do? Even warmed up to where the fan is running continuously it will not rev without missing and worst at rev limit with smoke and popping. Pops while riding, even on open straights. When cold, it will start easily. Quote Link to comment Share on other sites More sharing options...
bfa Posted August 20, 2010 Author Report Share Posted August 20, 2010 Check (carefully) for high voltage leakage between the plug and coil.... you may have insulation breakdown and the plug isn't getting a spark. Thanks for that! I will check it out. My first impression was that it could be an electrical issue, so I tested the resistance of most of the main components and they were all within spec. Also installed a new spark plug. Good suggestion, and I am also going to check the spark plug cap while I am at it. Quote Link to comment Share on other sites More sharing options...
munch Posted August 20, 2010 Report Share Posted August 20, 2010 after cold start ,how long before poor running? Quote Link to comment Share on other sites More sharing options...
bfa Posted August 20, 2010 Author Report Share Posted August 20, 2010 after cold start ,how long before poor running? Cold start: idles okay, I don't touch the throttle until the engine has warmed. Otherwise it runs poorly above idle. Quote Link to comment Share on other sites More sharing options...
munch Posted August 20, 2010 Report Share Posted August 20, 2010 (edited) send your e mail via a pm Edited August 20, 2010 by munch Quote Link to comment Share on other sites More sharing options...
marky boy Posted August 20, 2010 Report Share Posted August 20, 2010 i tried that, it don't get answered Quote Link to comment Share on other sites More sharing options...
munch Posted August 20, 2010 Report Share Posted August 20, 2010 fibber Quote Link to comment Share on other sites More sharing options...
for artie Posted August 20, 2010 Report Share Posted August 20, 2010 Make sure there is not an exhaust leak at the cylinder. Quote Link to comment Share on other sites More sharing options...
bfa Posted September 19, 2010 Author Report Share Posted September 19, 2010 SOLVED! Dielectric grease on the contacts on the 32 pin connector seems to have fixed it. The symptoms indicated electrical (and all other aspects of the engine were 100%) and it appears that it was just a matter of poor contact somewhere. Thanks for your input! Quote Link to comment Share on other sites More sharing options...
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