I got a Supertigre G-34 Schneurle motor. double ball bearings, it ran OK. It was choked a bit by a 13mm(?) crank. It was also kinda heavy, north of 9 oz. It also was ringed which has never been a good idea in combat, anyway. Hit the ground and get silt-sized particles in the ring would really screw things up.
I never saw a 35/36 version of the similar G-40 engine. It would have been a dud at well over 12 oz. as a G-35