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525sx back fires

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My 525 back fires when the bike is cold and warm. Will the mixture control screw stop it and if so which way should i turn it?

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Also check for exhaust leaks. My 520EXC and both 450SX's popped until I used some high temp silicone on the header connections.

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If it's stock. A JD kit works wonders.

If it's been jetted... I'd say set the throttle pump for a one second squirt. Otherwise it's still a bit too rich off of a hard throttle.

Really though... if the jetting is stock... change it FIRST.

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Mine did the same thing, even with the JD jetting kit. Sealing the header with high temp silicone eliminated the problem. Pull the header from the cylinder, apply a nice thick bead of silicone to the flanges and push the header back on. This should solve your problem.

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