My SJ50 winds up to 18,300 rpm on the test stand. I back off 500-600 from that. The Jetts are amazing!
For these best of engines, Jett of course, why not spend the $99 for an excellent torque wrench?
I got mine from Darrol Cady. He offers an excellent one, and has various props that will help.
Here's his web address:
http://www.darrolcady.com/index.htm
Look over his site, and call or email him. I wasn't sorry after I did.
BillO
London, Ontario, Canada