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Stihl 4Mix valve adjustments - when, if at all?

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I bought a Stihl FS90R string trimmer a few weeks ago. It was my understanding that the valves should be adjusted at about 50 hours of operation. I think my trimmer has had at least that number of hours.

When I left the dealer with the new piece, I looked at the service tech standing there who had fueled it, and got it running. I said, "check valves at 50 hours?" and he said "yes." I asked, "... instructions in the manual?" I was holding the bag with the Operators Manual in my other...

Stihl 4Mix valve adjustments - when, if at all?

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