I have a problem with an OS 32 ABC engine with 20c carburettor.

I have installed the engine in a Shuttle ZXX with the standard construction and muffler with a Futaba 240 gyro and fibreglass blades.

I have run the engine in as per the recommendations and I cannot seem to get the motor to perform efficiently.

My fuel mixture is 5% nitro, 5% castor oil, 15% synthetic, and 75% methanol.

I have the model vibrating from the RPM and I have not been able to eliminate it only reduce it.
I have had the motor attempt to stall on me mid flight.
I have excessive amounts of oil exiting from the exhaust.

The motor in idol position will stall on me as I apply power for take off and as I walk the model out to the flight line. The motor in idol speed sounds like a four stroke motor and as I turn in the low end needle setting this four stroking is reduced. I have also noticed that as I do this the vibration in the rear tail is reduced.

In frustration of not being able to get the motor running I removed the carburettor and reset the it back to factory setting as per the instruction manual and the main needle valve to 2 ½ turns out from the fully closed position and started from the beginning again. I am able to confirm the carburettor factory setting to be 2 2/3 turns in from the fully opened position for the low end needle valve for this motor.

I commenced to fine turn the motor and found the settings too rich and the model was struggling to lift off. After much time of adjustments I managed to achieve a satisfactory setting to enable the model to fly with suitable recovery and flight settings, but still needing fine tuning. Landing the model from a hover and with the throttle at zero and the trim setting at 75% the motor takes some time to return to a low idol RPM.

To achieve these settings I had to lean (turn in) the low end needle valve approximately ¼ of a turn from the factory setting and lean (turn in) the main needle valve to a final setting of 1 1/6 turns out from the fully closed position. With these setting the motor still wants to stall in the stationary position and I have excessive amounts of smoke and oil coming from the exhaust. The model requires further fine tuning to reach the optimum flight settings. I feel the low end needle valve needs to be leaned (turned in) an additional 5mm of a turn and the main needle valve an additional 5 clicks approximately. During flight I have excessive amounts of oil and smoke exiting the exhaust system. I touched the motor after flight to check how hot the motor was and found it to be not any hotter than the other motors at the field ie I feel it was not over heating.

How do I stop the motor from stalling on me while carrying it out to the flight line ??
How do I stop the motor from wanting to stall on me during flight ??
What do I do to get the motor working correctly?

Chris