I have a TH 75 in my Stuka and I like it a lot! The engine is very tight from the factory. You need to heat up the the top part of the engine with a heat gun so you can turn it over to start it the first time. After that its easier to turn over and after a few runs its fine. Very strong engine and fairly easy to adjust the carb. There were some comments at the field from other flyers about how a Th engine would probably run like crap. After they watched it haul the Stuka screaming around the field they were impressed and changed their tune![8D]