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I have a 2005 Yamaha YFZ 450 that has been having some carb issues. It idles fine, but after about half an hour or an hour of riding, it backfires and stalls. But it starts right up after sitting for half a minute. My YFZ is pretty much stock except for removing the baffle. I’ve done a ton of carb work, from a new mid body for the carb, R&D adjustable air fuel screw, and recently a 165 main jet and 45 pilot jet. Right now, the carb is set at two turns out with the 165 main and 45 pilot, and stock needle setting. I don’t have the air box lid off due to the fact that my area is very dusty. Any help, suggestions, and ideas are welcomed. Please help me out!!!
 

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I have a similar problem with a 2005. Started happening first ride after a rebuild. The bike will start and idle fine. As soon as it gets up to high rpms for a few moments it will backfire and lose power and die. If I immediately try to restart it won't, just backfires. But if shut off the ignition for 30 seconds it will start right back up. I tried replacing the cdi with 2 known good aftermarket ones for an 2005. Neither one will allow it to start, just an occasional backfire. Replacing with a new stock cdi shows the exact same issue with high rpm load.
 
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