Re: 9.9 Johnson Carb Question

[joesnuffy]

I hope we haven’t bombarded you with to much info. I was challenged with these motors not the normal plug and play omc motor.

You do have access to extra carbs so you might try that route first. I think that would be the best 1st step I would take.

Make sure the carb butterly is closing all the way when inspecting the carb your going to try or the one you took off that isn’t idling correctly.

Don’t be afraid to turn the low speed screw out more than the manual says to get a good idle I had to like 4.5 turns out on 1 engine. It was my thought that they sure put a bunch of threads on the needle for some reason. You might also make sure reed valves are closing completely by inspecting them with a bright light or see if one might be physically damaged or not closing as-well as the others.

I looked up the sprark plug listed for a 1977 9.9hp its showing a L77JC4 which I cross referenced to a NGK B7HS . The B6HS would be a tad hotter if your already using the B7HS and can’t get it to idle well.

Hope that helps,
Joe

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