Description
Overview:
This Flywheel is a Genuine Stihl Part for the MS 171 and MS 181 chainsaws, also suitable for the MS 211 range. Manufactured from a durable metal alloy with integral cooling fins, it stores rotational energy to keep engine speed steady and helps drive cooling air across the cylinder. The embedded magnets trigger the ignition module for consistent spark timing. Designed to fit the crankshaft taper precisely, it supports smooth idling, reliable acceleration, and stable cutting performance under load. Supplied to original equipment specification under Stihl part number 1139 400 1201, it is built for dependable use in domestic and professional environments where accurate engine control and long service life are important.
Key Features:
- Genuine Stihl Part for assured fit and function on listed models
- OEM-grade construction in metal alloy for strength and longevity
- Integrated cooling fins to aid airflow over the cylinder and reduce heat build-up
- Embedded magnets to maintain accurate ignition timing and easy starting
- Provides rotational inertia for smoother idle and more stable cutting speed
- Precisely machined hub and keyway interface for secure mounting on the crankshaft
- Balanced design to minimise vibration and wear on bearings and seals
- Compatible with MS 171, MS 181, and MS 211 variants for straightforward replacement
- Suitable for routine maintenance or restoring performance after impact or wear
- Designed for reliable operation in forestry, landscaping, and general site work
Typical Applications:
Replacement flywheel for Stihl homeowner and light professional chainsaws used in pruning, firewood processing, landscaping, fencing, and light construction tasks. Ideal when addressing poor starting, erratic idle, misfires linked to damaged magnets, cracked fins, or imbalance after impact. Supports regular servicing to maintain steady engine speed and cooling efficiency in daily use.
Also known as:
Magneto flywheel, rotor, fan wheel, engine wheel, balance wheel, ignition flywheel, cooling fan flywheel.
Fits Models:
MS 171, MS 171 C, MS 181, MS 181 C, MS 211, MS 211 C
Alternate Part Numbers:
1139-400-1201, 11394001201
Product Specifications
| L&S Part No. | 1139 400 1201 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 11394001201 |
| Unit of Sale | 1 |
| Machine Type | Chainsaws |
| Fits Brands | Stihl |
| Key Features | - Genuine Stihl part for MS 171, MS 181, MS 211 chainsaws - Metal alloy construction with integrated cooling fins - Embedded magnets ensure consistent ignition timing - Precisely machined for secure crankshaft mounting - Provides rotational inertia for stable engine performance |
| Fits Models | MS171, MS171C | MS181, MS181C | MS211, MS211C |
