Keep engines aligned with this genuine OEM flywheel key, part number X-42-15-S, designed for select Exmark, Kohler, MasterCut, MTD, Murray, Tecumseh, Toro, Stihl, or Lawn Boy Lawn Mower or Small Engine.
Grid is 1 inch square
  Flywheel Key X-42-15-S
  Flywheel Key X-42-15-S
  Flywheel Key X-42-15-S
Manufacturer Part

Flywheel Key X-42-15-S

Genuine OEM Part # X-42-15-SRC Item # 1602837
Manufacturer Part
Keep engines aligned with this genuine OEM flywheel key, part number X-42-15-S, designed for select Exmark, Kohler, MasterCut, MTD, Murray, Tecumseh, Toro, Stihl, or Lawn Boy Lawn Mower or Small Engine.
Grid is 1 inch square
  Flywheel Key X-42-15-S
  Flywheel Key X-42-15-S
  Flywheel Key X-42-15-S
$3.42
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Estimated DIY Savings: $299.83
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Keep engines aligned with this genuine OEM flywheel key, part number X-42-15-S, designed for select Exmark, Kohler, MasterCut, MTD, Murray, Tecumseh, Toro, Stihl, or Lawn Boy Lawn Mower or Small Engine.
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$3.42
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This part X-42-15-S is compatible with:

Product Type:
Lawn Mower, Small Engine
Brands:
Exmark, MasterCut, MTD, Murray, Toro, Lawn Boy, Kohler, Tecumseh

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Flywheel Key Customer Reviews

Common Problems Fixed by the Flywheel Key

Based on customer reports and repair data, this part commonly fixes these issues:

About the Flywheel Key

The flywheel key might have sheared in half. The flywheel key is a small metal piece which fits into the crankshaft and engages with the flywheel. If the engine stops suddenly, the flywheel key breaks in half to prevent damage to the engine. To determine if the flywheel key is broken, remove the flywheel from the engine and inspect the flywheel key. If the flywheel key is broken, replace it.