Hey guys i have a strange problem on a ys 91AC; [&o] hope you can give me hand when i broke the engine in it was runing more than great, after about 1 gallon of omega 15% i swicthed to wild cats 20/20 fuel im using the same glow plug (os F type) and a 14/8 prop in a Funtana ( flying at 3200 feet or so) the engine starts easily by hand, runs for 3-5 minutes at any range ( hi and low rpm) and then starts to fail, if i run at 1/2 trotle it slows and rises rpm on its own and then quits it does the same every fligth in fact i riped off the landing gear of the darn thing do to a engine faluer...... i just adjusted the clearence on the valves and it has the same problem what do you think it is???
ps the fuel lines are clean, so is the regulator and carb