Home › Forum › Ask A Member › 1985 johnson 9.9 running temp › Re: 1985 johnson 9.9 running temp
September 23, 2017 at 8:45 pm
#65284
Those 9.9 and 15s are the only motors where I have ever had trouble with Sierra impellers, and had to go to Johnson OEM parts. Even changing the housing to the Sierra one didn’t work, but, the problem was a bit different than yours, because the Sierra parts worked well except at very slow, trolling idle speed and the telltale stream did drop to almost nothing.
Dave