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SibSerge The couple of Stihls I've done so far for the 'scape service have required NO parts, just a process of discovering where the goop is hiding. A varnished float needle and seat on 1, and a badly plugged idle circuit and spark arrester (in exhaust) in the other ....cleared/cleaned as needed and bingo! Add some Lo-High carb adjustment tweaks....cold start in a couple pulls, idle steady, no stalls and mad revvers! Immediate 1 pull warm starts.
I can't offer input (other than my personal opinion) that the $120 quoted seems absurd.