I have a 7.5 air cooled 2-stroke Gamefisher boat motor. It has a Tecumseh engine. It has been sitting for two years and i cranked it up the other day. every time i engage the prop, the engine sputters and dies. i have a feeling that it is a dirty carb, but i cant find a rebuild kit for it. After I ran some carb cleaner through it, it helped but it was nothing drastic. Any help would be greatly appreciated.