Idle Speed Adjustment on 1989 88 SPL

M

marc.the.shark

Recruit
Joined
Aug 23, 2010
Messages
4
How do I adjust the idle speed on my Johnson 88 SPL? It is a 1989 MY engine.

Is there a separate idle circuit in the carbs that can be adjusted, or do I just adjust the main throttle plates via the cable adjustment.

The engine runs great at high RPM, but only idles at about 500 RPM and frequently stalls at idle.



marc
 
D

Daviet

Fleet Admiral
Joined
Sep 24, 2008
Messages
8,958
Re: Idle Speed Adjustment on 1989 88 SPL

There is a idle adjustment screw on the starboard side of the block. The parts breakdown will show it to you.
 
E

emdsapmgr

Supreme Mariner
Joined
Dec 9, 2005
Messages
11,551
Re: Idle Speed Adjustment on 1989 88 SPL

At idle the carb butterflys are closed and are not adjustable. The idle rpm is determined by the idle timing. For increased rpm, increase the idle timing by screwing in on the big screw on the spark lever. You want to set the engine idle to 650-750 rpm when idling, floating at normal level, in the water.
 
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