Re: What am i into here?

[Mumbles]

The marks on the OMC keys are to hold them snuggly in the keyway to keep them properly aligned with the centerline of the crankshaft. You can always upset the metal on your aftermarket key with a cold chisel if desired.

The 8 horse Briggs on our tiller loves to shear the aluminum key by the end of the season. It has a heavy cast iron flywheel which would probably bend the crank or split if the key didn’t shear. At least our outboards have rubber hubs in the props and shear pins to avoid this from happening.