Idle problems mercury 500 50hp

Joined
May 13, 2013
Messages
11
I can crank it and make it run at about 3000 -4000 rpm but cannot figure out how to make it idle right. It will idle a second and then sputter out. I've adjusted the idle screw..... Nothing. Help!!!
 

kazek

Petty Officer 2nd Class
Joined
May 14, 2011
Messages
177
Re: Idle problems mercury 500 50hp

Which idle did you turn?carbs low idle or idle. in the timing adjustment.idle adjustment should be done with engine under load in the barrel or on the water.do not run engine high in gear on muffs.there is link and sync procedure here in forums.if engine still sputters , carb cleaning is in order
 

bgc

Ensign
Joined
Jul 13, 2011
Messages
980
Re: Idle problems mercury 500 50hp

Have you run a compression test? I had two scored pistons and a bad lower seal that created this same issue.
 
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