That's the strange thing, it was running OK, and suddenly it stopped and couldn't get started again. temp was max 113C, there was a nice trail of smoke coming out of the exhaust and no signs of lean running. i run 16% as that's only allowed in 1:10 races over here. so i guess it might been just a bad plug or just bad luck. I already ordered the new parts for the engine and i dont want it to happen again.