OS break in

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This is after heat cycle in.
OS hit cylinders at top of piston.
It’s not complete.

I went paring lots for running in.

Keep 110 degrees centigrade with main needle adjusting.
Os can return idle from maximum.
It’s secondary needle is not  adjusted yet.
Engine sound is reduced by twice times.

After I adjusted secondary needle close.
Ensign sound is reduce once.
https://youtu.be/mrDqPfvIc3s

Zooming piston top.
Silver area is results of  break in.
It’s not completely finished.
Should silver area reach to mid  of  top oil lanes.
Black zones is indication of seizure.
It came from engine temperature high.
Another causes burry or dust are in to oil lanes.

Nova has many burries.

OS Sleeve quality is better.
Almost sleeve are operated for avoiding burry.

It’s a Nova conlod big metal.
It’s the best quality.
I can’t find any level difference.

It’s a OS piston.


We have to avoid dust and burry.
And needing attention for temp control.

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