Question about 2003 Yamaha YZ 250
The CDI and electronics on these bikes are pretty robust and trouble free. I am not going to say that they can't go bad but I can say that since the late 80s, I have seen very few bad electrical components on Yamahas and I have been riding and racing Yamahas since 1980. My point is - if the bike ran before you tore into it, it is entirely possible it is something simple like a bad ground wire connection or a connector that has a bent pin or something like that. Also check your kill switch to make sure it's not stuck or electrically closed - just disconnect it for troubleshooting purposes. The CDIs are pretty tough and over the years I have come to have a lot of faith in their reliability. I would start looking into the primary wiring and look for things like I mentioned above. It could also be something as simple as a bad spark plug or the connection right there at the plug boot. I hope this helped at least a little!
Posted on Feb 06, 2010
If you disassembled the bottom end and did not have a correct flywheel puller it would be very easy to permanently damage the stator coils. As a matter of fact it would be very difficult not to damage them if you pulled it apart the goon squad way.
Posted on Feb 16, 2010
Well when i put everything together i forgot to put the ground wire on, could that have burnt the cdi out?
Posted on Feb 13, 2010
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Posted on Jan 02, 2017
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