I have a PC-9 and used a 2 stroke .46 and the engine would never run right because the fuel tank is higher than the engine and it would just flood out. I would rather use a 4 stroke O.S. What size would be best and what mod's would I have to make for trouble free running, Perry Pump etc...?

<posted answer in wrong thread, sorry>

you should get into the fuel tank bay and grind off some plywood from the tank bearers so the tank goes down lower. i can,t remember which way the engine is mounted in the PC-9 but if its inverted or on its side , you can also try mounting it upright, this will raise the carby venturi level to stop engine flooding.

I'll try that, ty for thetip.</p>