Hi!

I found your email. Thanks!

Hi,
I have an "interactive" CD-rom that covers a lot of Briggs motors...
it
doesn't show a lot regarding the gear reductions; but this image might
help
answer your question.
It looks to me like a gear cut on the end of the crankshaft.
David

BoyntonStu

PS I purchased a keyed Interk 6.5 I/C with a keyed shaft.