A forum for owners of Yamaha TTR250 trail and enduro bikes!

The pick up is just a trigger pulse  I haven’t had to check mine so not sure of the voltage 

my first check is always the kill switch or wiring  (side stand switch )I’ve had moisture and dirt in the kill switch play up in the past 

agree ohm meter checks arnt 100% but a starting point  its Always hard to find parts to swap 

ttboof- thank you for those thoughts!! Yes I have checked the wiring and the safety switches with a meter, and to my knowledge, the starter motor won't try to turn if they are faulty so that, to me, verifies that the switches checks out. I'll check them again though for sure.

Brian- thank you for the greeting and ideas!! Yes I've checked the manual and as far as I could find, the only values for the parts in question are resistance values which do check out properly. I'm concerned that the pickup isn't sending a strong enough pulse to tell the CDI to fire the plug. Yes that link you mentioned is the very one I was referring to haha. So do you happen to know specifically what he bought that worked out? I'd like to buy the same and try it on mine Thnk you guys so much for your help. I'm sure I must be missing something and it's great to have other minds on the case!

Thank you Brian for doing that digging for me!! It's ok though, I'm glad you were able to help him out! Yes exactly, I'm not getting a spark from my new stator and pickup. I do know that the ignition coil resistance value isn't quite in spec. I'm not sure if that would cause full loss of spark, I'd assumed it might just cause weak spark. But when I jumped it from the battery, it does give very bright spark at the plug so I know it's at least somewhat functional. Have you got any ideas for me to check? Or a hunch of what my problem might be? Thank you so much for your efforts!

Ah John I appologize. I didn't phrase that very well. I meant that I took a wire, connected to the positive battery terminal, and directly brushed the coil to fire the plug. The battery and plug are both new and in good shape. Thank you for that thought though! Sadly I believe the problem is deeper than that.

Ongoing discussion here http://ttr250.activeboard.com/forum.spark#comment-64292058

yes the magnet induces a voltage in the winding in the pick up coil  ( ive never had to check a TTR but ones i have are from .2v to 3v ) , once the  pre determined voltage is recognised the cdi unit does its thing switching  the primary coil in the ign coil causing a secondary voltage - spark

CDI -- capacitor discharge ignition  , capacitor in the unit charges to a high voltage , the pick up coil triggers the unit and the voltage is dumped through the ign coil simple and complicated at the same time

its a hard one to diagnose as Brian has indicated check the work shop specks and anything else you can before making a call on the cdi as they rarely fail  (but can do )

I haven't had to look at a ttr ignition so a bit of a mystery in regards to the fine detail ( fitting this reply in during a break in a business audit at work haven't had time  to look into it much ) 

Elijah Bronson wrote:

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If its no bother, can someone tell me definitively that my pickup coil, at .05v, is alright and that it is not my problem? Thanks!

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 How are you measuring that - a multi-meter connected to the pickup connector whilst cranking the engine?

the voltage is probably AC not DC , if your checking on DC voltage it will show lower than it should .

if some one can check the resistance ( should be close to the manual ) and the ac voltage when cranking with the pickup disconnected , both figures should be a good guide to identifying a good pick up .

great news your  ttr is out and about with you on it not pushing it they are a great  bike

thanks for the voltage figures they they match up with what Brian has helped put together , we may now have a fairly accurate way if checking the ign system to help with making  decisions a  bit easier .

Great work, well done all