Brian
The motor seems to be running hot,and has a fair amount of carbon on the piston.
Running 11% Klotz,11% castor, 5% nitro, I had a similar issue with the ST 46 P/L at the start
it was over compressed with the standard head ,adding shims solved that. I have tried this with the
Max 35s but still not resolved, only using 3 oz of fuel for 7 minute flight, venturi is 0.281" ST needle valve,
was using Thunderbolt Hot plug, even tried a Medium heat plug.
Running fast 4 on ground, speeds up to wet 2 after a lap not what I want, have tried many props,
thought it was a tank problem, as soon as it went inverted it dropped back to 4 cycle.
Adjust height of tank,still no good, than it will go rich up right at different times in the pattern?
Fuel is not foaming, no vibration down lines, tried different prop dia, thinking over or under propped.
The reason for asking about side mount,I have an Enya 40 XZS that would not run right side mounted
yet mounted upright or inverted its runs great.