Description
Overview:
The High Speed Adjustment Screw is a small but critical Genuine Stihl component used to set the high‐speed fuel mixture on the carburettor of compatible two‐stroke machines. Built from durable materials to withstand fuel exposure and vibration, it allows precise tuning of engine performance at higher revs and full throttle. Correct adjustment helps maintain strong power, clean acceleration, and controlled engine temperatures. This screw fits a range of Stihl handheld tools, including blowers and brushcutters such as the BG72 and FS75. If your original screw is worn, missing, or damaged, replacing it with this OEM part (4211 122 6700) restores the intended adjustment range and secure fitment, supporting reliable running and consistent results in professional and DIY use.
Key Features:
- Genuine Stihl OEM part for assured compatibility and fit
- Enables precise high‐speed (H) mixture adjustment on the carburettor
- Helps optimise top‐end power, throttle response, and engine efficiency
- Robust construction designed to resist fuel, oil, heat, and vibration
- Factory‐equivalent dimensions for secure seating and repeatable settings
- Suitable for routine tuning after maintenance, rebuilds, or seasonal changes
- Replaces worn or lost screws to restore proper adjustment control
- Straightforward to fit with basic hand tools, minimising downtime
Typical Applications:
Used to fine‐tune the carburettor's high‐speed circuit on Stihl blowers, brushcutters, hedge trimmers and edgers. Common during servicing, after carburettor cleaning or diaphragm replacement, following fuel system work, or when adjusting for temperature, altitude, or fuel formulation changes to keep cutting and blowing performance consistent.
Also known as:
H mixture screw, high‐speed needle, mixture adjuster, H jet screw, carb needle, high‐speed tuning screw, fuel mixture screw (H circuit).
Fits Models:
BG72, BG75, FC73, FC75, FS75, FS80, FS80R, FS85, FS85R, FS85RX, FS85T, HS60, HS61
Alternate Part Numbers:
4211-122-6700, 42111226700
Product Specifications
| L&S Part No. | 4211 122 6700 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 42111226700 |
| Unit of Sale | 1 |
| Applications | BG72, BG75, FC 73, FC 75, FC73, FC75, FS75, FS80, FS80R, FS85, FS85R, FS85RX, FS85T, HS60, HS61 |
| Machine Type | Blower/Shredders, Brushcutters, Hedgetrimmers, Lawn Edgers |
| Fits Brands | Stihl |
| Fits Models | FS75, FS80, FS85 | HS60, HS61 | BG72 | BG75 | FC 73 | FC 75 |
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