1-1/8 crankshaft engine clutch problem solved

[Leftybowler22]

For all the help I've found on this great site I would like to share something that worked for me. I read about alot of people having problems finding or affording a primary clutch for a bigger motor with a 1-1/8" shaft. I had my 1" 780 bored to 1-1/8" and it works awesome with my Vanguard 23. It's a bolt on and go. It matches the stock secondary and uses the same belt. Very easy and alot cheaper.

[msafi65]

That's a great idea. I've cut keyway in old threaded Argo clutches but never bored a 780. I've had problems with the part they call the spider after pressing it off and reusing it. I drilled and pinned the last one that came loose as we couldn't get a new one. It's run for over 10 years now. Thanks for info.

[Leftybowler22]

I was able to leave the spider connected so I didn't have to worry about that either. It works like new.

[dave phelps]

Was this done in a lathe or something else?
thanks

[wedge]

You can do it on ether really. Just need a good Boring bar. But the key way needs to be Broached into it.

[Leftybowler22]

A lathe is best but my coworker has a mill and I bought him a boring bar and he was able to do it just fine. Broach a keyway and your good to go.