Home › Forum › Ask A Member › 1974 Evinrude 9.9 won’t idle at low RPMs, need help › Re: 1974 Evinrude 9.9 won’t idle at low RPMs, need help
I can’t comment on the booster gap but the cross referencing charts are only approximations. Most likely close enough. I don’t really know why the NGK work better then the Champions, on that motor, but I have seen it myself so I am a believer. I have heard of people using Champions with OK results as well. So what can I say.
One note on pulling that slow speed bearing. It is quite difficult to get at. Even difficult to see if one is even in there but most likely there is. We just don’t know its condition so I would change it. I have used a #8 deck screw to slowly bite into it and then pull it out. This is a dangerous approach because if that steel screw bites into the aluminum carburetor it can permanently damage the carb. I was given an idea from a poster previously, that I have not tried, but would suggest could significantly reduce the risk of damage. He suggested taking a barbed fish hook and bending it straight. He then inserted it lightly into the jet and used the barb to grab hold of that bearing. Sounds like a better approach, but I have not personally tried it.