This engine was sitting outside and had the fuel tank full of water and rust. I had to clean the tank out and clean out the rust from the main carb jet. It runs, but not as good as it could. It will not idle low enough for the clutch not to engage. I found later on that the mixture screw on this pulsa-jet carb was turned the entire way in. It looks like the proper mixture screw with the needle tip was removed and a regular screw put in its place.