suzuki 40hp 1996 idle inconsistency

bitsy4643

Seaman Apprentice
Joined
Oct 26, 2009
Messages
46
bitsy4643 40dt suzuki idle inconsistent

Suzuki 1996 40hp idle inconsistent
1996 suzuki dt40 is slow to start, will idle for 3 or more minutes at 800 rpms, then idle will slowly regress until engine stops. If you turn idle adjustment screw before it dies completely back up to 800 rpms, will run at this rpm speed for a few minutes and then begin picking up rpms to around 1200 + . Readjust idle down to 800 rpms, will idle fine for few minutes until slowly regressing or sropping as before. Carb is immaculate, float set correctly, new fuel needle valve and seat , and all new gaskets. Gas is fresh and has sea foam. Any help greatly appreciated
Idle mixture crew at 1 3/4.
 

gm280

Supreme Mariner
Joined
Jun 26, 2011
Messages
14,605
What about the fuel delivery system? Is the fuel pump working properly and teh primer bulb in good condition. How about the fuel tank itself and the tank vent. I would start there before digging into the engine itself. JMHO
 
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