Four,
I P.M'd another member who specializes in these class of bikes. I'll send on the info if I get a response.
I guess you guys got the starter in the mail today,
If nobody gets back to you guys before you head out tomorrow there is a general torque spec for iso threaded nuts and bolts.
Get a measurement on what size the bolt is and use that. That's if nobody can give you an honest answer. I have to give you guys credit for at least asking instead of just "Cranking" on it and possibly stripping it out.
Tuck\o/