Question about 2000 Yamaha WR 400 F

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Will not start no spark

Rode to a mates place turner bike off 20 mins latter went to start but nothing checked plug no spark power to on off switch

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  • paul_brooks4 Dec 18, 2008

    My 99 model wont start while hot.



    It starts first kick cold but when i let it idle for a while and turn it off, I go to fire it up again but wont start till its cold.

    I have cleaned the carby thoroughly and adjusted the pilot valve.

    does the pilot have any affect with this problem?



    Thankyou

  • coulsela Jan 15, 2009

    I have the same problem with a 1988 dr250, it always starts in the morning and will start straight after being turned off, but leave it sitting in the sun (35 degrees) at work for a few hours and it won't have any spark, come back after dark and it goes first kick.

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There is a black and white wire near the coil the should be for the kill switch or on / off if you unplug that wire you will bypass the on / off switch.
The CDI unit on the Yamaha often does not provide a very bright spark and it's often very hard to see in daylight. First make sure you replace the plug, second make sure you have it grounded well on a part of the engine. Make sure you have something covering the spark plug hole because if gas comes out of the cylinder and the plug does fire you can ignite the bike on fire. (I know that one from experience). I'd be willing to bet you don't have an ignition problem unless the key is shorted out. Sounds like the bike was running fine until you shut it off and then would not refire, did you try to push start it?
First things first, double check the spark, like I said it's VERY hard to see in daylight.

Posted on Dec 12, 2008

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