Bills: Sounds like you are getting that Mb290 going pretty good. Of the 2 I have, one has a broken trrottle shaft as you read. I dicovered I can controll the RPM by the other end of the carb shaft that has a plastic/nylon part that will also work to controll RPM. It stiil runs great. I can get my full money back, but have not decided too. I want to keep one going as a leaf blower. Too find another may be hard??? I wonder if anyone is using one of theses engines in a plane yet. How about that GUYS????? Capt,n