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5hp briggs & stratton outboard problem

scruffy63

Regular Contributor
I just got a 5hp Briggs & Stratton 5hp and it needed a new carburetor so I bought a new one and after installing the new one I have the idle set where it runs smoothe and idles slow. It starts easy and runs good until I get just about half way open then it stumbles and surges and back fires. any idea what I need to do to it?
 
I think the motor is newer it's the camo version, I will look for a model number I will check all lines and filter and pump. BUT what is sync the carb to ign. I have a service manual and read it thru and can't find that info.
 
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