I got a Stihl FS 38 trimmer and since i bought it brand new it has always oil fouled the plug every 2 to 3 weeks. We take the plug out and clean it and works fine again for about 2-3 weeks. I tried adjusting the carb to go a lean as possible but any more lean and it doesnt run right. Should i change the ratio of oil to gas or is there something else i shoulf try? We usually run it half throttle.
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