Zippi,
As far as tuning I have not done anything special other than follow the typical low and high end tuning procedure. Typically I first tune the high end for max rpm. Then I start to reduce throttle at about mid range I hold it and hear for any gargle or popping. If there is some popping or gargle I close the low end about 1/8 turn at a time while the engine is running. Once it runs fine at that level I keep on reducing the throttle to a quarter and repeat the process. Once around idle (whatever it can hold as far as lowest rpm) I start to tweak the low end again so that I do not head any popping or gargle. Once I have a steady low end then I go back to the high end and retune for max rpm again and back of a tad (about an 1/8 of a turn). Then go back on the low end and check the rpm hold. Now I check for transition from low to high. I let the engine idle for about 10 seconds and then advance the throttle instantaneously. If the engine is tuned in right it should advance without hesitation. If it lags then I open the low end about an 1/8th at a time until it advances rapidly without hesitation.

Next step is to give the engine full throttle and let it run for 5~7 seconds at max rpm. Then cut the throttle rapidly to idle. If the engine is set up correctly it should reduce rpm and start idling without any effort. A sign of incorrect tuning would be when the engine would quit from the rapid deceleration or initially gargle a bit before the idle reaches steady state. If the engine runs erratically from high to low rpm before it settles to a steady idle it means that the low needle is too lean. Open it up 1/8 at a time and repeat the high to low rpm test. That is what I do in general when I tune and engine.

On the other hand, I changed the carburetor and ignition so that makes a diferenec too. The engine runs ten times better now. You can read the information at the thread that I pointed you to. I have so far about 1.5 gallons of fuel though it. I have run synthetic about 35/1 for the first gallon and now I am running 48/1 synthetic. It works for me if you have any other questions let me know.