Question about Yamaha SZR 660 Motorcycles

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2006 GRIZZLY When I THROTTLE LIGHTLY THE MOTOR

2006 GRIZZLY When I THROTTLE LIGHTLY THE MOTOR BACKFIRES THRU THE CARBERATOR. I HAD A YAMAHA DEALER REBUILD THE CARBERATOR WITH NO RESULTS.
WHEN RIDING AT NORMAL SPEED (5-25 mph) NO PROBLEM.
ANY IDEA ?

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When a motor backfires from the carb several things can be at fault.

A part throttle backfire can be caused by a lean condition. Too much air and not enough gas. The carb could be jetted too lean. Does your machine have stock exhaust? Pipe changes play havoc with jetting.

Your engine could be sucking air from places other than the carb venturi. Try squirting carb cleaner around the intake while the engine is running and listen for engine speed changes. If the engine speed changes your intake fittings may be at fault.

If the condition occurs under a load a weak valve spring could be the culprit. Instead of keeping the valve closed a weak spring will allow exhaust to exit through the carb.

Your problem may be a combination of the conditions I've mentioned or none. It's hard to diagnose an engine over the Internet.

Posted on Oct 25, 2011

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Check valve adjustment and cam chain tension

Posted on Sep 08, 2009

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