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stihlsaw066

2012 carb or valve issue?

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stihlsaw066
i just got this 12hp briggs going in my 2012 it will run good at just above an idle and at idle ive ajusted the jets by what the briggs book says ive cleaned carb tank line everything it usally is its running on a 12 coil thats fine charged battery so the spark is all good but no matter what i do if i try to rev it up it starts chokeing right out blowing black out the muffler if i turn the jet in just dies do i have a valve issue?

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LPH-5
my one cent worth/if you got blowing black smoke your to rich (with gas)If you got a Briggs book there is two adjusting screws on the carb, recheck your screws(idle and high speed)maybe something is not adjusted right in the carb like the float,nozzle, float needle and seat leaking, if your plug is wet when your blowing black smoke then your getting to much gas, rev it up and pull the plug out quick, and see if its wet..Good luck..

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