Home › Forum › Ask A Member › 1969 Evinrude / 1971 Johnson 9.5 Runs Poor › Reply To: 1969 Evinrude / 1971 Johnson 9.5 Runs Poor
Well, I think the sync might be your issue. There are a few different linkage pieces here that are easy to mix up and not get installed properly. I wish I could be more explicit in my guess, but I remember having this same issue that last time I looked at one of these issues many years ago. The key here is that you can’t get the sync to line up according to manual instructions. If those linkage pieces are not assembled correctly, the throttle plate will be held open and the engine will sneeze/pop at low speeds. And yes, I did hear the somewhat rich condition at high speeds, but let’s try to get the sync right which might solve that issue as well.