Hi all i have just put a new zdz 50 in my aircraft and i don't know if it's a tuning problem but the motor takes a bit to clear after the first start, then it;s fine with the transition but a funny thing happens from about 3/4 throttle to full throttle i drop revs. there is no problem with the servo geometry so i guess it is a tuning problem, any help would be appreciated

Cheers Dale