1994 merc 40

[singlet39]

I just had carbs rebuilt and now when i kill it it wont start up.If i put my hand over one of the carbs and choke it it starts right up.It starts fine at first start and once it cools off the problem starts.Any info would be a big help.

 

[Laddies]

Re: 1994 merc 40

It sounds like a lean idle mixture

 

[singlet39]

Re: 1994 merc 40

how can i fix this?Is it a simple fix?

 

[astro1800]

Re: 1994 merc 40

turn each one of your idle adjustment screws out a quarter of a turn till the problem goes away. idle mixture is to lean.

 

[Scali]

Re: 1994 merc 40

I'm pretty sure you want to make sure it's "just right" or could engine can blow prematurly, I'd do a search or get another Tech to give you exact procedure

 

[Moody Blue]

Re: 1994 merc 40

Set idle mixture as follows; engine off<br />1) turn idle mixture screw lightly in all the way on both carbs (don't tighten). Note position.<br />2) Turn out screws 1 1/2 turns. Start motor.<br />3) Turn each screw out slowly until motor begins to run rough (too rich). Note position of screws.<br />4) Turn screws in slowly until motor begins to run faster (too rich). Note position of screws.<br />5) Set screws to midpoint between step 3 and step 4. Set the adjustment a little on the rich side instead of on the lean side. Good luck.