Inverted 2 strokes take a little extra care and tweaking, but when set-up properly, they can run just as well as any other installation.

As mentioned above, the tank installation needs to be just right...and the carb needs to be adjusted just right...and the starting proceedure is slightly different.

I have several inverted 2 strokes, and always remove the plug before the 1st start of the day...and I leave it out until after filling the tank. Make sure the throttle is all the way closed while fueling...then open the throttle all the way and motor the engine over with the starter to make sure there is no accumulated fuel in the engine. Put the plug in and start it...throttle set a few clicks above idle.