Electrical problem on an '03
Posted July 15, 2007 - 05:48 PM
Did 2 laps on the track and bike starts missing terribly, not backfiring just misfiring completely. Barely made it off the track under it's own power. In fact stalled for the last time just as I was pulling into the pits. Won't restart.
I pull the brand new plug and it's gas fouled really bad. Stick another new one in the cap and check for spark. NOTHING NANDA ZIP ZILCH!
How common is it for the coil/plug cap to go bad? It seemed to show up when the bike got hot.
I think whatever it was, has been going bad for a while. Last few times I've ridden I noticed a hiccup everytime I'd crack the throttle. It finally died.
Posted July 16, 2007 - 04:05 AM
TPS also may have moved if it is loose - on the carb
If none of this - possibly CDI
Posted July 16, 2007 - 05:33 AM
Posted July 16, 2007 - 05:37 AM
I'll check the carb while I have the plastic off, but it definitely doesn't have any spark.
no spark - is not the carb.
Posted July 16, 2007 - 12:52 PM
Posted July 17, 2007 - 06:29 AM
Posted July 17, 2007 - 09:41 AM
I suspect it was overzealous pressure washing on my part.
Posted July 17, 2007 - 12:45 PM
Now that the bike has been sitting in the garage for 2 days, I've have a weak spark. Which happened on Sunday too. After replacing the plug for the first time, the bike ran rough. Seemed to load up. I didn't think much about it at the time. I pulled in for a break and it sat for about 25 minutes. It fired right up after that, ran for about 10 mins and that's when it started cutting out really bad. It seems to be a heat related issue.
I've checked all electrical connections (ignition coil, stator coils and kill switch) they are within spec.
Which component is most affected by heat? Will work when cold, will die when hot?
Isn't it so much fun tracking down electrical gremlins?
Posted July 17, 2007 - 06:30 PM
When my first one went bad, the Yamaha mechanic troubleshooted my bike for 7 hours before he finally gave up and just started swapping parts. The coil gave him a good ohms reading, but it was bad, none the less.
BTW, the mechanic was well qualified and highly spoken of by people who did not work at the shop.
Posted July 18, 2007 - 07:24 PM
It turned out to be the CDI, I tried 3 different coils, a new wiring harness 9had a spare) and finally swapped out the coil.
Sparks came back strong, could be anything.
Coils are pretty robust, just a bunch of wire wrapped around a steel post really.