I'm running a 2 blade tapered tip warpdrive. I have a 75" Whirlwind I will install after the landing gear upgrade. Can't wait to see if it's as smooth as everyone says it is. I got my WW used so I won't be bias cause it cost twice as much as my other prop.
Wow, it sounds like your Rotax has been nothing but problems. It stinks that you have had so much trouble with yours. Mine runs great, I'm just tinkering. Even if I didn't do one thing to it i would still be happy with the way it operates. BTW what year was your engine produced? Some of the early ones had ignition wiring issues. Did you complete the 5 year rubber replacement? Mine was over due and my carb sockets still looked new.
Crossover doesn't seem to make much of a difference. The Ballence Master helped more. I have a slipper clutch on the way. By no means do I feel like my engine runs ruff. I just think it could be as smooth with the ULS cylinders as it was with the 80hp
I planned to tap the manifold so i could adjust the direction of the fitting, but there was not much material left after machining the hole. I opted to weld and prey its where i need it. hope to try it out this weekend.