Oil for break-in after top end rebuild 1982 GPz750

zukdave wrote: When I did my motor I fired it up on Rotella 15-40 ran it long enough for
it to idle no choke then did a drain and fill then put a fan on ran about 10 min.
and did a oil and filter change then went and did a few WFO blasted down the street
and changed it again.

I do change my oil every time I go to the track so lets see about 25 mile's on it and the
next oil change will be number eight

Tyrell Corp wrote: This is an interesting topic, ring break-in is critical and there are differing opinions.

I have an old Wiseco XC GPz615 piston kit and the rings are NLA - there was a thread on this subject a few years ago and the same used pistons were later gifted to me by a member here (thanks Corey)

Ring gaps are all within spec, I asked total seal about it - presumably these guys know piston rings, and their recommendation was, in the absence of a new ring set they can't supply, to use their dry break-in lubricant powder and a non synthetic oil initially. This motor is still on the bench but I will report back in due course.

Edit: those 82 GPz750 twin shock are very good, strong motors and great handling, enjoy!