Fitment:
for Stihl FS89, FS89R 2-stroke gas trimmers.
for Stihl FS91, FS91R 2-stroke gas trimmers brushcutters.
for Stihl FS111, FS111R, FS111RX 2-stroke gas trimmers brushcutters.
for Stihl FS131, FS131R 2-stroke gas trimmers brushcutters.
for Stihl FS311 2-stroke gas brushcutters.
for Stihl HT102, HT103 2-stroke gas pole pruners.
for Stihl KM91R, KM131R 2-stroke gas kombi engines.
Note: Fits 4180 series 4-MIX engine models setup. Does not fit older FS80 or FS85 2-stroke models.