From one Bricklayer to another Bricklayer. I would take my brick set, and brick hammer to it, and then break out the stihl demo saw! ....Just kidding! Sounds like a carb issue that can be be corrected with the help from someone who has some experience with mds engines. They do have a history of having some troubles, but there are also those who like them, and should be able to offer you some help. Sorry I couldn't be of more help. I just saw by your username that you are a bricklayer, and I am also a bricklayer, so I thought I would give you a bit of a hard time. LOL