Oil on pistons?

It's a 650 brawler mechanical secondary.
I tuned it last night set initial timing at 12* and got my vacuum to about 15... that's the highest it would go probably because of the 268xe cam. I heard they don't give much vacuum. It ran a lot better after I did this. But.. that's when I inspected everything this morning when the engine cooled down.
12 looks low to me unless its higher comp
power time it until it bucks the starter and back it off abit
recheck your float level
make sure transfer slot is right then readjust carb