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05 yz450f WILL NOT START

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Wow guys, I'm clueless at this point.


I have an 05 yz450f that I got not long ago. Was running fine, started doing minor stuff to it. (Levers, chain & sprockets, hot start cable, etc.)


Reshimmed the valves to put them back into spec and it ran fine. Took it to a track and ran fine. All of a sudden, 1 week later, it doesn't want to start at all. I've completed a carb rebuild and have gone through the carb 3 times as of this afternoon. No leaks or anything. Put a new hot start cap on it to make sure it's not an air leak from there. The timing is still in. I checked.


It will get a little froggy and back fire every couple of kicks, but it WILL NOT START! Even have a brand new spark plug. It has a great turn over sound and is just at the cusp of firing off, but no cigar. I'm out of ideas

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Clear the cylinder and start over

Wide open throttle and kill button at the same time, kick a dozen times.

Then start as normal but turn the idle in 1/2 turn first. Start with no throttle but the choke on.

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