October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Engine Backfires

Ensure idle adjustment is correct.
Ensure automatic choke operation is correct.
Check for clogged carburetor main jet.
Ensure ignition timing is correct.
Check carburetor mixture control duty cycle using dwell meter.