Couple of days ago I posted about my 100 only running with the choke mostly out and water getting into the oil. I haven't figured out the water problem yet but I have found the source of why the tractor needed some much choke. Today I changed the carb from the 100 and my A. Now the A need a lot of choke and the 100 is running great. Guess tomorrow I will open them up and see what is inside. I've had the carb from the 100 apart a number of times, ran a wire into the little holes and did everything I know how to do to make it real clean. Someone mentioned on my other post maybe the venteri is in backwards.I didn't think that would fit but I will compare it to the good carb tomorrow. I'm going to be made at myself if it is that simple. If it is in backwards I didn't remove it from the carb so the last guy to work on it would have done it. Probably the same guy that put the distributor on so the clips are at 9 and 3 instead of 12 and 6. I would love to have this fixed so I can rake hay with this tractor next week.