I just cleaned the carb out. Dont think there was too much goop but I did all the stuff- I put tubing inside the HSN cavity and on the carb connection, then held under alcohol and blew as hard as I could. Did this with both the carb closed as well as open and with one tube plugged as well as open. I pushed in some throttle wire inside the carb as well as HSN hole gently to dislodge anything stuck. I blew in air in all directions. That is about all I can do. Did this with both the LSN all the way in as well as out.

I then set the LSN to 2 turns out, HSN at 3 turns out and ran the engine a bit at idle. I had a lot of dark brown and a bit of black oil in the exhaust. Finally, I again set the LSN back to 1.7 turns out, cleaned out what oil landed on the floor and ran it again. This time I just got some burnt castor. Ran it at idle only, cant go to full throttle in the appartment. It did get a bit hot but I wont know by touch.

I will put a tach and temperature gauge on it on Sat-sun when I can head to the field. I will also use plain-castor-no-nitro mix that a fellow flier has and see the difference. Will report then

By the way, I am using MAS K series throughout, both 14x4, 14x6 & 14x6 so sound behaviour is likely to be consistent

Ameyam