Hello all, in the weeks before I tried with different muffler pressure with no avail... always dead stick landings, with some fin and stabilizer damages that put a stop on the matter, until finally the Enya TN carb arrived.
Today I managed to try the engine ( but no flyng due to strong gusty winds..):
it improved dramatically! Now with muffler pressure an APC 11X7, 5% nitro and a new Enya 4c plug, the minimum could be set in 2700 rpm with good transition, max set to 10,500 (peak 10,700) good midrange.
The real minimum probably could be set in 2400 rpm, range but I want to try in air before fine tuning idle needle and minimum rpm. I noticed that after full throttle, with still some pressure in the tank, the minimum slows 200-300 rpm form some seconds than slowly picks up to 2,700 -3000, it could stay there for 5 minutes with very good transition when opening throttle.
I will confirm in the following weeks, hoping for better wheather!.
Paolo
PS: The new TN carbs had still several swarfs in the barrel (due to grinding machining), so look carefully before using anithing new!