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GCV 160
by NormK - 07/11/25 03:53 PM
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Anonymous
Unregistered
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The flywheel key on a 4hp Briggs and Stratton keeps shearing. Does anybody have any idea what to look for to fix this? Any help woould be appreciated!
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Joined: Dec 1999
Posts: 5,387 Likes: 34
Repair Junkie
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Are you trying to run the motor without the blade plate on?
If so you will continue to shear the flywheel key.
If the boss on the blade plate has movement in it shear as well.
I hope that this will help.
Regards,
Bruce
Regards, ![[Linked Image]](https://www.outdoorking-forum.com.au/forum/images/members/mower-monsterw.jpg) Bruce Please do not PM me asking for support. Post on the forums as it helps all members not just the individual.
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Joined: Mar 2003
Posts: 5
Novice
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I have found this a common problem with 4 hp B@S motors with the alloy key. I always clean the crankshaft taper and the inside of the flywheel and the key with lacquer thinners to remove any trace of oil, no more problems. You must also make sure the retaining nut is very tight.
cheers,
Wal
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Joined: Mar 2003
Posts: 5
Novice
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I have found this a common problem with 4 hp B@S motors with the alloy key. I always clean the crankshaft taper and the inside of the flywheel and the key with lacquer thinners to remove any trace of oil, no more problems. You must also make sure the retaining nut is very tight.
cheers,
Wal
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