Re: 1974 Evinrude 9.9 won’t idle at low RPMs, need help

[frankr]

My 1st guess is that the high speed orifice (jet) is partially clogged. That would account for the excessive choking need. 2nd guess (well actually 1st) is have you heard yet that those motors were notorious for fouling spark plugs? Are you sure it is running on both cylinders? Try new plugs, I don’t care if they were just put in recently. I’ve seen brand new motors that wouldn’t run one weekend without fouling plugs. Bad.

3rd guess is major air leak. But let’s not go there yet.