River, I would bet your o66 that you posted a picture of is runnign on the rich side. The piston looks to be well washed by the transfers, which indicates low piston temps/rich carb tuning.
MX2T/2R piston after being run at 32:1 for a extended period.
Yes ben you are spot on on reading piston wash,,, You have to remember I mix @ 40:1 W/ Ultra on the work saws and 32:1 Klotz R-50 on my hot rods,,, and yes I usually tune a stump buster to the point of four stroking and then go lean to the point that it picks up rpm then barely back out a smidge,,, Have never had a problem,,, Now on my hot rods,,,,, they look really clean like yours,,,,, by comparison,,,,I've have learned over time for the work saws it is better to have a little cushion and be able to get in and get out and be going to the next stump/job instead of didlin with a busted saw,,,, Time is Money!!!!!
Yeah and I agree with Haywire!!!!!!
"I quit buying anything with a Citgo label on it when ol' Hugo started spouting off. Our local Citgo station must have felt the pain cause he recently switched to Marathon."
Nuff said,,,,