Same mower as before - 21hp. I purchased and installed a new carb kit. The mower starts easy now, but backfires every few seconnds until it stops running. Any ideas on what I can try now?
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check the flywheel key. a sheared flywheel key will let the flywheel turn, and throw off the ignition timing.
also try applying choke to the carb when running. if this clears it up, then you are still chasing a fuel problem. otherwise check out the key
Service Manager and technician for small engines and lawn equipment