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StevenC=> What causes this problem and what => is the fix? The basic problem is that the intake valve is open when the spark fires. The fix is to redo your basic tuning procedures -- valves, dwell, spark timing -- and check for simple mistakes like misplaced plug wires. You'll also want to check for damage to the carbs as a result of the backfire. Parts can be blown off and distorted by the blast. Steven Ayres, Prescott AZ '66 KG1600 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~