Small Engine Troubleshooting Problems? Ask a Mechanic Now.
I doubt carburetor will cause backfire, I would want to check the valve clearance (lash) .004 on intake and exhaust, with piston at top dead cylinder. Spark plugs at .028 inch gap.
Carburetor has no adjustment other than the idle screw. Which is screwed in and out and basicly serves o purpose on golf cart, as it kills when it comes to back to idle position. As I said before, your tune up should consist of valve adjustment and a new spark plug.
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Did you get to check the valves? Please accept to close.