Originally Posted by stiltskin
Sorry if this has been asked before. I've heard that the 1.3 pistons are "smoother". If I'm running 60/40 weight oil f/b with the standard pistons, what oil is similar with the 1.3?
I would say it is AT LEAST 70/50, perhaps even 80/60 to compare to the 0.9mm holes. I think you should stick with what you have or perhaps drill the 0.9mm holes to a No. 56.
If you have a newer kit you may already have the 1.3mm pistons as in the last month or so the kits have had them included.
Jeff