I've been doing ALOT of fiddling and I've gotten my Dad's MDS 48 to run OK, but it too won't run consistantly. I've gotten it to run well for 1 flight, but I have to retune it before the next one. The 46 FX on the same plane starts with a chicken stick within 3 flips, and never needs any tuning unless the weather has changed ALOT since the last time.