Guys,
I have the armoral in the fuel (base fuel is Sig 5% with a little added Castor to bring it to 26%), didn't see any bubbles in the fuel line, prop is balanced, motor is not shaking around, tank is tight. The current prop is a top flite 9x6 launch at 9100 ish. I am going to pull the engine and do the soap bubble test on the head and backplate. Anything else worth trying?
Best, DennisT