Not Ranked
Turk, the pop is , like others have said, an exhaust leak. As far as jetting, you have 2 choices. Go to a rear wheel dyno with air fuel mixture reading capability and jet the carb accordingly. Second way, put your cobra in third gear at 2000rpm, floos it to the red line, keep it floored, and then shut it off, pull it over , pull a plug and read it. Then jet accordingly. When you do this, do not let off the throttle and then kill the motor. As soon as you shut the throttle blades at high rpm, the motor goes lean as there is no fuel. This tends to clen the plugs. good luck, scott.
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