I have a Clinton J700 1106C 7hp motor that I bought to use on Arizona high mountain lakes with horsepower restrictions. The motor moves my 12ft Lund fine but is extremely difficult to start even after a carb rebuild. Even more so after it has been run for a while. My dad can't get it started at all. It has a choke that you use your thumb to restrict the air flow and I have a lot of trouble with that as well. Is there something you would suggest to alleviate this problem or is just the way the motor functions. Thanks