Posting for a friend and waiting on plenty of additional information including Serial Number. 40hp Tiller approx 2000 Model Year. Basically says that motor does not respond until throttle handle is turned 50% of the way. I know there are a lot of moving parts between throttle arm, through linkage, etc. Just looking for some logical starting points in terms of the most likely root of the problem. Any help appreciated. Will post additional information when I have it. Thanks!