How to Replace the Flywheel Key on a 6.75 Briggs

Written by chris baylor
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How to Replace the Flywheel Key on a 6.75 Briggs
Lawnmower with Briggs & Stratton engine (cutting grass image by katja kodba from

All Briggs & Stratton small engines, including the 6.75 HP Briggs models, employ a flywheel key between the flywheel and the crankshaft. This key is designed to shear if the implement encounters an obstruction that could cause damage to the flywheel or crankshaft. A new Briggs & Stratton flywheel key can be installed in just a few minutes.

Skill level:

Things you need

  • Socket set
  • Briggs & Stratton flywheel puller
  • Large pair of vice grips or slip-lock pliers
  • Large screwdriver
  • Open-end wrenches

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  1. 1

    Disconnect the spark plug wire from the spark plug.

  2. 2

    Remove the three 7/16-inch bolts holding the starter shroud to the engine. Lift the shroud off the engine.

  3. 3

    Unscrew the starter clutch from the top of the flywheel. Place a large screwdriver across the fins to keep the flywheel from rotating. Position the vice grips or large pliers on the clutch and turn counterclockwise to remove.

  4. 4

    Attach the flywheel puller to the flywheel. Tighten the bolts of the puller into the bolt holes in the flywheel. Crank down on the nuts on top of the puller to loosen the flywheel. After it pops loose, lift the flywheel off the crankshaft and remove the puller from the flywheel.

  5. 5

    Remove any remnants of the broken flywheel key from the crankshaft key and flywheel key slots. Insert a new key into the crankshaft.

  6. 6

    Position the flywheel over the crankshaft with the key slot aligned with the new key. Re-install the clutch and tighten with the vice grips or pliers.

  7. 7

    Place the starter shroud over the clutch and engine. Tighten the three bolts to hold the shroud in place. Re-attach the spark plug wire to the spark plug.

Tips and warnings

  • To protect the crankshaft and flywheel, use only genuine Briggs & Stratton flywheel keys.
  • Always remove the spark plug wire from the spark plug when working on a small engine.

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