Briggs Outboard Carb Adjustment

R

rebelyell

Active Member
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
 
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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.
 
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?
 
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.
 
Now it will only run on full choke
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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.
 
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