I have a new(unused) but 6 year old OS 40LA that i installed in a goldberg tiger 2 ARF. after breaking in motor( the same way i have with previous engines) i put the plane in the air and after about 3 min it dies in mid air...so we start it up again and it runs fine so we put it up again and it dies agian...this time we run it on the ground and (fatten it a little) for about 10 min and it doesnt die so we put it up and it didnt die agian for 2 more flights (10-15 min each)...the next day me thinking it was going to work we go flying and it dies after about 2-3 min in midair...so we richen it up even more and go up again...it does good this time till i am flying it inverted for a while and it dies... i dont know what to think the klunk is moving freely i am using omega 10% just like in other OS 40 LA's that i have but it just doesnt seem to want to run...i have the baffle taken out but that never made a differnce before. Does anyone know what the problem could be?