Question about 2002 Yamaha TT-R 250

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1999 TTR 250 Wont SPARK...

This bike has been sitting down in our shed for about 5 years. I got it out and found the cylinder had melted due to NO OIL! After boring and installing a new piston I have the motor back in the bike but it will not spark. I have gone over the wires and they all seem to be well connected.

I am not too handy with the multi-meter, but i did try to test Ohms on the ignition coil. and it gave similar results as an ignition coil off of our running 4-wheeler. I tried to test for a sign that the magneto was working and it shows signs on the multimeter. (though i don't know what to look for)

I do have the service manual for it, but am just not having any luck.
Any Ideas? Suggestions? Thank you very much

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  • rangoneer Jun 19, 2009

    I have a new NGK and that didn't help. But last night I got a pull down the lane and Drop Started it in 2nd or 3rd gear and after about 1/4 mile it would fire but not run for long on it's own. I got back to the house, and the starter switch seemed to stop working. After cleaning the electrical connections with high pressure carb cleaner I put it back together and it got spark!



    It would fire with the starter at this point, but will not idle for more than 5 seconds. My old carb had Ethanol deposits throughout it, so before I started replacing the piston I replaced the carburator with one off of a running back from Ebay that was in Canada. Maybe the jets are for a different elevation. I'll give that a look as well as anything else you guys suggest. Thanks!

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Have you replaced the spark plug it may be stuffed


hope this helps

Posted on Jun 18, 2009

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