RE: Stihl 65cc 4-mix on 30% Edge
Here is what Ralph at rcignitions.com had to say when I asked.
"I converted 4,2 with the stock mag and CW rotation and 2 with EI and CCW rotation....Making a mount plate for the CCW rotation takes a little bit of figuring and tapping some larger holes in the casting...
I tried a few different carbs, but didn't have a 4 stroke carb with the extra diaphragm spring...They ran about like a G62 with the same size prop...
They run pretty hot, the sensor on the EI engines had to be mounted in a G10 ring instead of the usual aluminum...
Never found a good solution to the carb, but was told a WYK 33 rotary barrel carb has adjustable needles and should work...I made a gasket with a small hole in the center to restrict the intake..That seemed to work the best...
The only advantage to the Stihl over the G62 was the sound and fuel consumption, a larger prop didn't work any better on the Stihl than on a G62....The theoratical torque advantage of a four stroke would take an engine designed with a different cam profile and larger valves..
Might be a thread on RCU, try a search...."
And that is when I did a search and landed here.
I'm waiting for a definitive answer before I move ahead.