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Old 10-09-2012, 02:03 PM
Ridin' Green Ridin' Green is offline
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Join Date: May 2011
Location: Michigan
Posts: 9,627
The 90 is definitely a 4 stroke/mix, and it is a pro grade trimmer, not homeowner machine. Stihl recommends a one time valve adjustment at 139 hours, or as needed depending on how the machine is running.
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