Reguardless of what engine you purchase, I would recommned that you break it in right side up,, then invert and make sure it is reliable inverted. I origionally installed the La. 46 [:'(] and it would not run reliable inverted and when below 1/2 throttle would die[>:].

I pulled the La. 46 and installed it in an Ugly Stick in the vertical position and it has not been a problem.

The nobler now uses a saito .56 inverted and it is reliable.