Reply To: 1967 sportwin 9_1/2 hp

[Don]

The high speed jet has to be pretty plugged up to affect idle quality.  So, if the engine runs OK at high speeds, I’m sure the idle issue has nothing to do with the high speed jet.  In any event, don’t try to remove that jet without the proper jet screwdriver, you will bung up the threads and the jet.  You and try to use a pipe cleaner soaked in carb cleaner, try passing it through the fixed jet while it is still in place on the carb.

You may be able to get a better idle adjustment once you have the engine on the boat and take it for a good run on the water.