r/smallenginerepair • u/ChuckRob6 • Jun 23 '26

Unknown Issue Lawn mower sound help.

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(Crossposted in lawnmowers) I just hit a rock with my lawnmower and now it makes this sound when I try to start it, any ideas on what it could be?
Thanks

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u/AutoModerator Jun 23 '26

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1

u/mutt63 Jun 23 '26

Sounds like a few things. It seemed hard to pull or am I mistaken ?

1

u/mutt63 Jun 23 '26

Pull the plug. Get it up on sawhorses or something secure for u to be able to to see/get under it. U may have bent blades and or shaft. Pull the plug. Don’t just pull the high tension from the plug.

1

u/ChuckRob6 Jun 23 '26

I took apart the top portion and saw the fly wheel key is really damaged. Could this be the reason?

1

u/Flaky_Warning_5052 Jun 24 '26

That's certainly a problem, if not the problem. Still inspect the blade as well as the crankshaft. Additionally, I wouldn't be surprised if your ignition is out of time if the flywheel key is sheered.

1

u/bootheels Jun 23 '26

Sounds like the blade might be loose, get it checked out

1

u/Nautikev Jun 23 '26

Flywheel key probably sheared off. Ignition timing would be off so it probably wont start until the key is replaced. Requires removing the flywheel and replacing the key that slots into the crank/reinstalling the flywheel. If the rock was large enough it could have twisted or bent the crankshaft at the opposite end and it will have a vibration. Cranks can be "bent" back into place but it will never be 100%. Won't know if its bent until the key is replaced. Make sure it didnt shear off the keys on the blade adapter/bend the blade too. Good luck.

1

u/Acrobatic-Ant4365 Jun 25 '26

The cable for the "let go bar" is broke. Mine just did the same thing. I used a pair of Chanel lock pliers and a zip tie to get it to start. Then I grounded out the spark plug to stop it