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XT 600e not running right (2003 Model) XT 600e not running right (2003 Model)
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 7 Dec 2009
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Unhappy XT 600e not running right (2003 Model)
Hi all. I'm new to the single cylinder biking scene. I've got myself a 2003 XT600e. When I first got it it seemed to hesitate a little low down in the revs, below 4000, but it wasnt really noticable. As time went by it got worse, and lurches below 4000 and also developed a flat spot around 4000. It even lurches when you let go the throttle and coast down to a stop (in Gear) coming up to traffic lights. The only time it runs right is full throttle and just below that. Ive had it down the Yamaha dealer and they had the carbs apart several times and cleaned them thouroughly. I also had it Dyno'd and this showed lean fueling below 3000, which Yamaha then fixed. But after all this, its still not right. I think its time to look elsewhere on the bike, not the carbs. I've serviced it before yamaha got hold of it, changing everything to new, even the air filter, so there's no external blockages. Spark plug was changed again by Yamaha just to be sure. Do I have a lemon?
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Old 7 Dec 2009
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i had similar problem with a GV250, after 2 months cleaning carbs and changing sparks, i discovered that the problem was in the CDI, get one with a friend to test
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Old 7 Dec 2009
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Can I help?
Hi Derek.
As you're in The Smoke, you may want to come over to me in Dartford. I have a 2003 model and you can try my CDI if you like.

Regards,

Geoff
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Old 7 Dec 2009
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could be the cdi unit but its worth checking the wiring harness and the ignition pickup itself

the vast majority of pickups are basicly a coil of wire and a magnet passing by it triggers a voltage change in the coil of wire so the gap between the two is critical also the wiring and connections need to be very good to get the best out of the pulses triggered especially a lower rpm where the pulse is going to be slightly less (think of a turbine they work better the faster they spin) the higher rpm's might be enough to get a good trigger

the "magnet" on the xt is a raised area on the magneto/flywheel and passes the pickup mounted in the side cover if the cdi swap doesn't cure it
it might be worth checking the clearance on the pickup
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Old 8 Dec 2009
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Thanks very much guys. Its probably worth mentioning that I'm a very amature bike mechanic, and I dont know haw to check pick-ups and the like. That being said, I dont think my local Yamaha dealer knows either. Thanks for the offer Geoff, I'll keep you posted, as I'm crazy busy at work with Christmas coming up, I dont even have a weekend to myself! Do any of you know of any single cylinder Guru type mechanics around London? One that wouldnt balk at my problem?
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Old 8 Dec 2009
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I just read a few more XT 600 posts, and it seems a loose wire on CDI units is a common fault. I need to check this out before blowing greenbacks on CDI units!
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