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Old 04-03-2016, 04:19 PM   #16
Fred K-OR
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Join Date: May 2010
Location: Stayton, Oregon
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Default Re: Timing question again! with Pic

Is the backfire in the carb or exhaust? If carb, might be your GAV is set to tight. Open it a bit and see what happens. You mentioned you did some work on the carb and thus something with the carb may be your problem.
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