We just took delivery of a pontoon boat with the DF115 engine last week. After a couple of uses I have two questions:
1. The throttle ramps up very quickly with initial movement of the throttle lever -- it is difficult to select an engine speed between 750 rpm and 2000 rpm. Is this typical or adjustable? With very careful movement I can get to an intermediate speed, but it is really sensitive.
2. In gear at idle speed there is a slow vibration from the engine area as if the shaft was bent. The engine doesn't appear to be shaking at idle. But give it any throttle at all and the vibration goes away.