Was doing some maintenance as part of a 1,000 mile break-in on a new build and decided to borescope the cylinders and saw scoring. i've seen scoring before from wrist pin, debris, and overheated pistons but not scoring like this. any ideas what this came from? i changed oil on the new build at 50 miles, 200 miles, 500 miles, and am about to drop the oil for the 1k mile services. during break in the engine never got super hot and it wasn't flogged. i followed the S&S break in recommended method. the plug on the front cylinder was a little white, rear was coffee and cream color.

any ideas?

 

Looks normal.
Those borescopes have created undue angst in the best.
Scott