Question about 2007 Suzuki DR-Z 400 SM

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My 07 DRZ 400SM backfires when I let off the throttle.

When I let off the throttle to slow to a stop my bike pops and lets up really quick. I have an aftermarket exhaust and I don't know if that has anything to do with it. I have been told by a friend that I am getting too much air and not enough fuel but I have no idea how to fix it. I don't want to cause further damage to the motor so if anyone has pointers let me know. Thanks.

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You have an air to fuel ratio screw on the carb that may help. Is the exhaust factory or after market? Google the service manual on it and find where you can adjust the fuel air ratio, not hard to do.

Posted on Jan 08, 2009

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