Briggs Outboard Carb Adjustment

[rebelyell]

I've got a Briggs 5HP outboard that I can't get the idle mix adjustment screw to the right position. Looking for some tips to help get it set right. I pulled the whole thing apart and cleaned it well. Put the idle mix screw back in and turned it the same six turns it took to bottom it out when I took it apart.

Now it will only run on full choke and even then I had to turn up the idle screw. If I turn it off choke one notch, it dies.

New fuel lines, new carb bowl and jet gaskets. Fuel pump is new. Carb is clean. Model: 12y602 0110 E5 030530 FA

 

[StarTech]

12Y602-0110-E5

Did you clean the fuel nut (bolt) as it is the main jet?

 

[rebelyell]

12Y602-0110-E5

Did you clean the fuel nut (bolt) as it is the main jet.

Yep. Clean as can be.

 

[Rivets]

Did you set the high speed mixture first? My experience tells me to always set high first, then idle.

 

[rebelyell]

Did you set the high speed mixture first? My experience tells me to always set high first, then idle.

There's only the idle mixture screw and throttle valve screw.

 

[StarTech]

Then there is still a clog the carburetor most likely and a good ultrasonic cleaning might be in order. I have seen carbs to take 2-4 30 cycles in 160W USC unit to get them clean.

 

[rebelyell]

I thought so too, but I'm able to spray carb cleaner through every hole and get fluid out of the other end. Do you think that there could be some buildup behind some of the plugs that are one way only?

 

[sgkent]

check to make sure that the gasket between the carb and body isn't screwed up, like it popped off one stud while you were putting the carb back on. Sounds like a huge vacuum leak.

 

[rebelyell]

Checked that also and it's good. All gaskets are in the same order and orientation that they have always been.

 

[sgkent]

Now it will only run on full choke

go thru the carb again if you can't find a vacuum leak. Also check the manifold for breaks if it is a plastic manifold. Check all the jets and float level. Check the fuel pump if it has one. The description screams of too much air or too little fuel, or both.