Description
Overview:
This genuine Stihl flywheel (MPN 4140 400 1200) is a precision engine component for small two‐stroke Stihl machines such as the FC 55 edger and KM 55 Kombi engine. Made from cast aluminium alloy with cooling fins, it stores rotational energy to stabilise engine speed and helps direct airflow around the cylinder. Integral magnets trigger the ignition module to produce a consistent spark for starting and running. A correct, balanced flywheel is essential for smooth operation, reduced vibration, and reliable idle and acceleration. Use this OEM part to replace worn, damaged, or corroded flywheels and to maintain the performance and service life of your Stihl equipment across compatible trimmers, brushcutters, blowers, hedge trimmers, and multi‐tools.
Key Features:
- Genuine Stihl OEM part for assured fit, balance, and compatibility
- Cast aluminium construction for strength with low rotating mass
- Finned design supports engine cooling airflow
- Precisely balanced to reduce vibration and improve smooth running
- Embedded magnets provide stable ignition signal and reliable starting
- Direct replacement for MPN 4140 400 1200
- Helps restore idle quality, throttle response, and overall running
- Durable, corrosion‐resistant finish suited to outdoor use
- Straightforward fitment for routine maintenance or engine rebuilds
Typical Applications:
Replacement of a cracked or chipped flywheel, broken fins, weakened magnets, or damaged keyway. Useful when diagnosing hard starting, misfires, stalling at idle, or excessive vibration. Suitable for preventative maintenance during overhauls of high‐use tools in landscaping, grounds care, and construction environments.
Also known as:
Engine flywheel, magneto rotor, ignition rotor, ignition flywheel, balance wheel, rotor wheel.
Fits Models:
BG 45, BG 46, BG 50, BG 55, BG 65, BG 85, BR 45 C, BT 45, FC 55, FS 38, FS 45, FS 45 C, FS 45 L, FS 46, FS 46 C, FS 55, FS 55 C, FS 55 R, FS 55 RC, FS 55 T, HL 45, HS 45, HS 52, KM 55, KM 55 C, KM 55 R, KM 55 RC, MM 55, MM 55 C, SH 55, SH 85
Alternate Part Numbers:
4140-400-1200, 41404001200
Product Specifications
| L&S Part No. | 4140 400 1200 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 41404001200 |
| Unit of Sale | 1 |
| Fits Brands | Stihl |
| Key Features | - Genuine Stihl OEM part ensures fit and compatibility - Cast aluminium with cooling fins for engine airflow - Embedded magnets provide stable ignition signal - Fits models including FC 55, KM 55, FS 55 - Durable, corrosion-resistant finish for outdoor use |
| Fits Models | FS38, FS45, FS46 | FS55, FS55C, FS55R | HS45 | BR45C | SH55, SH85 | BG50 | BT 45 | HS52 | BG55 | BG85 |
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