Question about Ariens 21 In Classic Walk Behind Push Lawn Mower ()

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Ariens self propelled hit a rock will not start clanks and smokes Crankshaft does not seem to be bent. Somtimes kicks back when trying to start.

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If you have kick back or the mower backfires you probably have a partially sheared flywheel key.

The good news is they are cheap and designed to shear to protect the motor from damage.

You can take the recoil cover off the engine and then remove the nut that holds on the flywheel and gently pry off the flywheel.

You should see a mangled flywheel key that was under the nut holding the flywheel on. Take it to a mower parts store and match it up with a replacement. Put the new one back in and reinstall the flywheel.

That should do it! Good luck and be careful!

Posted on Aug 24, 2010

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Hi hardister2...


Sounds like you sheared the key that holds the flywheel to the crankshaft, this is a common occurance when you hit something hard with the mower running.
You will have to remove the flywheel to replace the key.
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Please take time to rate me

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My wife was mowing the lawn and she hit a rock. Since than the lawn mower does not start and when it tries to start a little smoke will come out of the carburator area. The mower is a Sears eager 1...


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How do you define rough areas? If you are mowing a rocky area then, yes, there could be a problem. Otherwise, you should not have a problem, even if the mower is set too low to the ground for high grass or thick brush. The crankshaft does not break that easily, my friend; you would have to hit a big rock with the blade with enough force to break that crankshaft.

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Flywheel?


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I hit something with , when i start the lawnmovers it goes crazy


The vibration is caused by a bent blade and/or a bent crankshaft. The first thing to do is to replace the blade to see if the vibration goes away. If it does not then you have a bent crankshaft. The higher rpm's is not normal but is probably caused by a timing problem caused by a sheared or partially sheared flywheel key.

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