Just need to know how do you break in a tt 39 on a test stand. The manual says use 25% oil content, I cant find any. So can I add castor to my 15% nitro 18% oil fuel. If so HOW MUCH CASTOR per gallon of fuel.

Thanks guys

Just get some 15% and keep it good and rich for the first 3 or 4 tanks and then start to lean it out a couple of clicks at a time (on the high speed needle) till you get good power. Some people break them in on the bench, but most people break them in right in the heli. If you have never flown a heli before you really should find someone to help you get it broke in and set up right.

thanks charlie