Originally Posted by
PROVK
Tom
I found that when I was using runnertime it would leave a lot more stains like that and even gunk in the bearings when left unsed for a few weeks.
Ruunertime has a lot of caster oil in it.
hmm possibly it's never happened to me before. i wiped as much of as i could and it seems to have come of the top of the piston now that i have run it at close to race temp.