Re: 1966 Johnson 20HP, need help!

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Posted by Spike ( on September 06, 2005 at 17:19:38:

In Reply to: 1966 Johnson 20HP, need help! posted by CA on September 06, 2005 at 13:01:09:

Classic symtoms of a fuel supply problem.
If your motor has an adjustable high speed jet,have you tried to adjust it?Start at 3/4 turn out from gently bottomed.On some motors you may need to remove the knob in order to turn it far enough.Then put the knob back on at the midpoint setting.
If only one knob then it has a fixed high speed jet.Float adjustment with carb inverted float (true top) should be even with the gasket surface.With no more than a 1 1/2 inch drop when right side up.
You may have to clean the carb with special attention to cleaning all passages and jets.
Be sure the fuel system is clean and sound from tank to carb.

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