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8 Posts
With Walbro carb, two adjustment screws (one black, one white w/plastic cover in shape of steer head) as well as an idle speed screw. The trimmer was running, though "doggy" and wouldn't idle, I backed out the black screw ~3/8 turn and made it run and idle like a precision watch LOL when warmed up. Now, after cooling and attempting a cold start it wants to flood as soon as the starter rope is pulled, even w/o choke. I can make it run by turning the screw back in to within ~1/4 turn of bottomed out but can't find a happy medium between where I started and where I am now. Btw, fuel system and air filter are clean, with fresh gas/oil @ 32:1. I'd like to know exactly what the two adjustment screws do, and some guidance on getting the carb adjusted... properly. Thanks