What RPM is the engine rated at, Brian ? It should turn about 14,500 (guess)
with a 10-6 APC (which is also good for digging weeds). I would probably
hang a 9-8 MAS or Zinger on it, and wind the snot out of it.

I'm wondering if the pinch will go bye bye when you allow to piston to expand
at full running temp.

Dave.