I am familiar with the Rotax' engines as almost all my meager flight
time is behind either 503 or 582 engines, some 900 series as well.

I agree about the operator error but I like the incredible smoothness
of the triple Yamaha. It would produce a conservative 75 to 80 hp
with 75 ft. lbs of torque at 6800 rpm. It is also very common locally
with lots of highly qualified shops used to mountain tuning.