Stihl fs 90

[Jason Pitcher]

How on earth do I tune the carb on one of these 4 mix engins? I had to slap a new carb on and now have no baseline for carb settings.

 

[ray benson]

How on earth do I tune the carb on one of these 4 mix engins? I had to slap a new carb on and now have no baseline for carb settings.

There is an old FS90 and a newer FS90. Newer initial settings
FS 90; FC 90, 95; KM 90 (C1Q-S110) – Open the high speed screw H 3 1/2 turns counterclockwise. – Open the low speed screw L 1 1/4 turns counterclockwise.
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