A failed impulse coupling can cause the crankshaft gear to break off. This will cause the aircraft's magneto not to work therefore the aircraft's engine will not start.


No parts required.

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  • Use a 9/16 wrench to unscrew the nut on the drive shaft.

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Image 1/1:
  • Remove the lock washer underneath the nut.

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Image 1/2: Image 2/2:
  • Pull away the impulse coupling.

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To reassemble your device, follow these instructions in reverse order.

One other person completed this guide.

Kelsi English

Member since: 09/26/2012

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Cal Poly, Team 1-2, Propen Fall 2012 Member of Cal Poly, Team 1-2, Propen Fall 2012


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