crazy4rc
I have been running inverted engines for a while. A few Saito's an an OS hanno. The Hanno is pumped so there is no problem with it.

The Saito's do seem to sag a bit at the top of a long vertical line, but my fuel lines were at 14" from spray bar to rear of tank. I fixed this by installing a Cline regulator. They ran like a top after installing the regulator.

On an inverted engine you have to have the low end set correctly for it to run right. When you shut the engine down after a flight pull the throttle and trim lever all the way back and burp the tank. This will keep the carb from flooding. Spend the time to get both Hi and Lo needles set and you won't even know the engine is inverted.

I haven't had any trouble hooking and unhooking the glow starter on mine. You get used to where it is and the motion it takes to do it. The Saito glow plug angles back so that helps keeping you hand away from the prop. To me it is no different than an upright or side mounted engine....RESPECT the PROP.

DEG