Check for cracks on your crankshaft or broken fins. Replace them if you find such damage. The tapered sections must be clean and smooth, with no play between the two. Inspect the keyway and flywheel for damage. Slight burrs may be removed with a file. Then, make certain there is no play or wobbling when the flywheel is placed on the crankshaft. Inspect the flywheel key. If there are any signs of shearing or if you have doubts about its condition, replace it. It's simple and inexpensive. First, obtain a new flywheel key designed for your make and engine model from yourBriggs & Stratton authorized dealers.
Place the flywheel on the crankshaft and look through the flywheel hub to align the keyways on the flywheel and crankshaft. With the flywheel in place, place the key in the keyway; it should fit securely. If you feel play, check to see if the key is upside down. Debris can also prevent the key from seating in the keyway. Once the key and flywheel are securely in place, reattach the flywheel nut or clutch. Consult your authorized dealers for the torque specifications for your make and model.
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