My 550 series Bolens lawnmower won't start. When

check all wiring connections and a switch under the seat like lawnmowers have. there may be a cutout switch under the seat.

Probably bent the shaft. Disconnect the spark plug to prevent accidental starting and lay the lawn mower on its side. Slowly turn the blade with your hand and watch the center of the shaft. If it wobbles at all it is bent. $150 to $200 job. Probably time for a new mower.

Check your under side. For grass builtup

lack of fuel
possible water in the unit or blocked main jet
have the carby overhauled

Drain gas tank, remove float bowl from carb and clean. Add fresh gas with Stabile. Prime 3-5 times, pull cord 10 times to start.

that engine uses a fin style governor remove the upper cover and see if there is a nest or something holding the fins movement

go to replace pull cord follow instruction

Hello. Get a can of starter fluid. A couple of good squirts into the air cleaner and it will take right off for you. J.

try a touch of starting fluid right into the carburator by taking the air filter off. If it then starts but wont run or stay running, the reservoir below the carb should be removed to clean at and the pinhole in the intake tube above the bowl nut. This is the most common problem with lawnmower start problems, the pinhole can be unplugged with one wire from a wire brush. Be careful with the gas, at least pinch off the gas hose with a vise grips while removing the carb bowl.. Never use a droplight around gasoline.

Be sure the fuel is fresh....meaning, fresh from the gas station. IF that doesn't fix it, replace the carb.