After one gallon....and a tiny tweek on the LSN, the 75 has a deep throaty roar, excellent transition, and runs on fumes. Highly recommended engine. I will buy the TT 91.

It seems TT FS engines need ALOT of break in. I can confirm what fellow members have stated. But excellent engine.

With a 13x4 APC, rpm was 10400....

Will see what it does with a MA K series 14x6...

George.