I had Moki 1.35 and currently have OS 1.08 in 2 different UCD's both inverted w/o a problem. I used a Cline on both because I moved the tank over CG and to stop the siphoning of fuel. You might be able to go without the Cline but fuel will siphon into the carb if open and some leaks out when priming,its best to prime,then flip prop,prime,flip prop several times with inverted engine before starting. This helps ensure getting enough fuel in to start as some will run out the carb. I would think once its started,it should run right even w/o the Cline,might have to set the needles?