NewTop End Break In on a Tri-Z

[Just-Tri-It]

I read a post once that said using synthetic Mix instead of a Conventional Oil Mix could lead to glazing on the cylinder walls during the break end period on a new top end.
Is there any known truth to this statement?
If not, is it possible to get glazing using synthetic oils in any manner?
Thanks.

[El Camexican]

That’s a 4 stroke thing in my opinion. I start with a mix of at least 32:1 of a high quality 2 stroke oil and do a few heat cycles. Google it, there’s lots of info out there on the topic.

[bkm]

I dont use any oil on the cylinder or piston on initial start up to keep the rings from glazing. Yep, dry. If it's a complete rebuild, I pour a tad of oil down the main bearing holes. I usually run a conventional oil.

Sent from my SM-G960U using Tapatalk

[Dirtcrasher]

I very lightly oil it, and a drop in the plug hole.

Then just a few lower RPM heat cycles up more RPM's each time and you're all setskie...

[Just-Tri-It]

I changed the oil to conventional Yamaha 2 stroke oil. I have run it several times up to 1/2 throttle on a mile straightaway, but not hammering it as such. Seems to be ok.
But it seems that it's a tad easier to kick start that at the first heat cycle. It stick has a good compression kick to it when I start it, but a little less than at first.
That may be normal or the result of a little glazing. I did not test the compression at first to compare it now. But any idea what a new top end compression psi should be?
Thanks

[El Camexican]

If you just rebuilt it in stock form and haven't done any port work, or shaved the head it should have somewhere between 150 and 170 psi depending on the gauge you use and the altitude you're at.

Look up the proper way to check compression, throttle wide open, kick till the gauge won't go any higher etc.

Don't be too concerned about having oiled the rings during assembly, millions of engines have been assembled like that over the years. The worst thing you can do is baby an engine too much, or lug it. Don't take it out and hold it wide open for a mile yet, but do get the revs up and lean on it while going through the gears for a few seconds at a time once its at operating temperature.