Twin K90 / Anders. I've run 18%, then 20%, then 22% and in desperation 25% Caster/Klotz blend and still K90 problems. Also tried top cooling only and a mod head button and still the same, Bang !!!. :o
4 P/S, 2 Wrist Pins and 2 Rods later I gave up and I'm not the only one that's had these...