1. Crankshaft bent. This happens if you strike a solid object. Go to an authorized shop and ask if they straighten cranks. They might not do it. If not, have it replaced. DO NOT ATTEMPT TO STRAIGHTEN A CRANKSHAFT BECAUSE IF YOU DO IT WRONG, IT WILL BREAK.

2. Blade(s) out of balance or broken. Have them sharpened and balanced. If broken, replace ASAP!

3. Flywheel has a broken fin. This only happens if the flywheel has been dropped or hit with a hammer. Flywheel must be replaced.

4. Equipment other than the engine is out of balance or damaged. Have this checked out by an authorized dealer for that equipment.

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