So I just came into a bunch of XL-12's, SXL's, and SXL-12's. I'm parting them out for the most part, and in tearing one apart, I was questioning whether the top end was good, so I pulled the jug. Inside, I found a white, chalky residue built up in the flywheel-side transfer port, and a bit of buildup on the flywheel-side of the top of the cylinder. P/C look good, no scoring, or immediately noticeable difference in wear from one side to the other.
What's going on here?
What's going on here?