Small Engine Troubleshooting Problems? Ask a Mechanic Now.
This is the single cylinder Kawasaki engine? When was engine last run?
Backfiring through the carburetor when cranking, can be a valve that is stuck. Remove the valve cover and check the valve movement.
That is a start, are you close to the mower where we can try this and other test? Would you have a compression gage to see if it has low compression from a valve not seating?
When did you last run the mower?
Backfire is typically spark occurring when the valve is open. Can you remove the rocker cover and check the valves?
Timing is a possible problem, but I doubt it would be the cam gear. Mire likely would be the flywheel timing key, between flywheel and crankshaft. But I would rule out the valves first! Much easier to check!
Experts work from home, and I was out walking my dog!
Did you find problem?