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Discussion Starter · #1 ·
hi everyone, im having problem with my 12.5 hp briggs vertical shaft l-head , engine is surging and i can see gas spitting inside the carb,surges bad when throttle is changing but when i close the choke about half way it runs great. the carb was submerged in carb cleaner for 3 hours ,air compress. cleaned, did not help. mixture and idle screw were adjusted. (no changes when mixture screw was rotated either way) your help on my next step will be appreciated.
 
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