Stihl Carburettor C1Q-S56A FR85T, FR85

The Stihl Carburettor C1Q-S56A is a genuine OEM replacement part engineered to restore smooth running, strong performance, and reliable starting on compatible Stihl two-stroke machines. Constructed from durable die-cast aluminium with precision steel and brass metering components, it ensures the correct air-fuel ratio for stable idling, crisp throttle response, and consistent power. Designed for Stihl brushcutters, trimmers, and similar handheld tools—including popular models like the FR85T and FS85—this unit is a direct replacement for OEM part number 4137 120 0604, fitting seamlessly without modification. Built to Stihl’s professional standards, it’s ideal for both commercial and domestic users who need dependable performance in tough conditions.

Manufacturer Part Number: 4137 120 0604
Brand: Stihl — Genuine OEM Part

Key Features:

• Genuine Stihl replacement carburettor for perfect fit and compatibility

• Robust die-cast aluminium body resists wear, heat, and corrosion

• Precision fuel metering for smooth idling and clean acceleration

• Optimised for two-stroke brushcutters, trimmers, and similar tools

• Direct replacement for OEM 4137 120 0604 — no adjustments or fabrication needed

• Supports easy cold starting and stable running when correctly tuned

• Helps cure poor running, flooding, and hard-starting caused by old or clogged carbs

• Durable build suitable for regular professional or DIY use

• Designed to perform reliably in dusty, high-vibration outdoor environments

Typical Applications:
Used to restore proper performance on Stihl brushcutters, trimmers, hedge trimmers, and pole pruners involved in grass cutting, edging, scrub clearing, hedge shaping, and general site maintenance. Ideal when engines are hard to start, won’t idle properly, surge under load, or show signs of fuel system wear or contamination.

Also Known As:
C1Q-S56A carb, Stihl FR/FS series carburettor, Stihl 2-stroke carb assembly, fuel metering unit, or replacement carburettor for the FR85/FS85 range of handheld power tools.

Fits Models:
FC73, FC75, FC85, FH75, FR85, FR85T, FS75, FS80, FS80R, FS85, FS85R, FS85RX, FS85T, HL75, HL75K, HT70, HT70K, HT75, KW85, SP85, SP85K

Alternate Part Numbers:
4137-120-0604, 41371200604