I have had three Moki"s and have yet to get one of them to run right. I had a new one and two that were well broken in. Their owners were selling them out of frustration. I lost count of the deadsticks! In my opinion I think the venturi area is too large. Look at the OS 160 it has a restricter. The Cline pump helps in some cases, but if the engine was properly designed, wouldn't be necessary. I want to fly not nursemaid an engine. There are too many good ones out there to waste time with a lemon. I have seen some that run good but at what cost in time, frustration and after market gadgets.