Description
Overview:
The High Speed Adjustment Screw for Stihl 08S (part number 4201 122 6700) is a genuine Stihl component used to set the high‐speed mixture on the carburettor of the 08S petrol chainsaw. This precision‐machined metal screw allows accurate, incremental adjustments to the H circuit so the engine can reach correct maximum speed under load, with clean pick‐up and safe running temperatures. Built to the original specification for the 08S, it fits directly and holds its setting securely despite vibration. Durable materials and a precisely formed tip help achieve repeatable results during servicing and routine tune‐ups. Choosing a genuine part helps maintain performance, reliability and longevity by ensuring proper compatibility with the carburettor and overall fuel system.
Key Features:
- Genuine Stihl part for assured compatibility with the 08S
- Part number: 4201 122 6700
- Precision threading and tip profile for fine, repeatable adjustments on the high‐speed circuit
- Robust metal construction to resist wear and vibration in demanding use
- Helps optimise carburettor mixture at high speed for power, efficiency and cooling
- Direct replacement for the original screw; straightforward to fit and adjust
- Secure setting retention to minimise drift during operation
- Supports routine servicing after air filter, fuel or seasonal/altitude changes
Typical Applications:
Used during carburettor tuning to restore top‐end performance, correct lean or rich running at full throttle, and stabilise acceleration. Ideal after carburettor rebuilds, when the original screw is damaged or missing, or when conditions change (temperature, altitude, fuel blend). Suitable for preventative maintenance on Stihl 08S chainsaws to keep cutting performance consistent.
Also known as:
Often referred to as the high‐speed mixture needle, H needle, high‐speed jet adjuster, carb H adjuster, mixture needle (H), or high‐speed fuel screw. These terms describe the same function: precise control of the high‐speed fuel mixture on the carburettor for safe maximum engine speed and reliable power output.
Fits Models:
08S
Alternate Part Numbers:
4201-122-6700, 42011226700
Product Specifications
| L&S Part No. | 4201 122 6700 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 42011226700 |
| Unit of Sale | 1 |
| Applications | 08S |
| Machine Type | Chainsaws |
| Fits Brands | Stihl |
| Fits Models | 08S |
