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Usually there is not. The timing is through the flywheel that connects to the crankshaft and it is permanently set with a woodruff key. When evereything is tight, the timing is good. IF you hit something and cause the blades to stop, the flywheel can move and twist on the shaft and bend the woodruff key. The engine then wont start or will backfire etc. To fix this you need to pull the flywheel off the crankshaft and replace the woodruff key and reinstall it.
The engine is timed internally and externally. Sometimes when it backfires the external timing key where the flywheel and crankshaft join will be damaged enought to put the engine out of time. The engine may run but when put under a load such as cutting grass it will fail. This is about a 30 minute repair and about $2.00 in parts.
the best thing to do is to clean or replace carb filter.. check spark plug for fouling clean or replace also if gas has been sitting in unit and stored outside I would drain gas because of water contamination..
It sounds like you are putting it into choke mode. The choke is usually all the way up on tractors. And it will make it backfire and flood out. Just rev it high enough to work and don't go into the choke mode. hope this helps.
I am not sure what time of lawn mower this is, but if the blade is directly tied to the motor, usually the belt will just slip if not, but if this is directly connected to motor, it might have jumped timing. If this is not the case, inspect under the mower deck, and determine if there is something jamming the blades against the deck or if their is something bound around the blade, this can cause more strain on the motor, which could result in the symptoms your experiencing.