What typically causes a backfire. Motor runs great, but backfires when I shut motor off and immediately turn it back on. If I were to wait a minute b4 starting it up, it typically does not.

Was thinking of cleaning the carb, but I just did that 2 years ago and have really had no issues with the carb. Motor idles perfectly at around 1100 RPMs.

I always use new gas, has new gas line, and after disconnecting the fuel lines for storage I throw the old gas in the truck in the spring.

Motor has around 340 hrs.

Just wondering.

Thanks

Sucking cool air back up in the heads through a blown exhaust gasket can cause that.

As can the engine just not quite getting enough fuel on that last (on shut off) or first (cranking it so quickly after shutting it off) burn cycle (effectively a lean condition, but nothing to worry about).

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Cool.