Description
Overview:
This genuine Stihl flywheel (part no. 1123 400 1203) is a core engine component for popular homeowner and pro chainsaws. Cast from durable aluminium alloy with integral cooling fins, it stores rotational energy to smooth engine pulses and drives airflow around the cylinder for dependable cooling. The embedded magnets work with the ignition module to trigger a consistent spark, aiding easy starting and clean running. Designed for the Stihl MS 210 and MS 230 families, it offers the correct fit, balance, and magnet alignment for this engine series. A direct replacement for a worn, cracked, or damaged original flywheel, it helps restore stable idle, strong acceleration, and overall reliability. Genuine Stihl part for assured compatibility and long service life.
Key Features:
- Genuine Stihl OEM component for correct fit and dependable performance (1123 400 1203)
- Robust cast aluminium alloy construction with corrosion resistance and low weight
- Precision balanced rotor to reduce vibration and promote smooth running
- Integrated magnets positioned for accurate ignition timing and reliable spark
- Cooling fins move air across the cylinder and flywheel housing for thermal control
- Direct replacement for the factory unit; uses existing fixing hardware
- Engineered for the MS210/MS230/MS250 family and earlier 021/023/025 models
- Helps cure issues linked to damaged fins, slipped keys, or weak ignition
- Supports steady idle, clean throttle response, and consistent cutting power
- Suitable for regular chainsaw use in DIY, landscaping, and forestry work
Typical Applications:
Replace when the original flywheel is cracked, fin-damaged, corroded, or when ignition timing issues cause hard starting, misfiring, or poor idle. Ideal for routine engine rebuilds or repairs following a sudden stop that may shear the key. Keeps Stihl mid-range saws running reliably for cutting firewood, pruning, felling small to medium timber, and on-site maintenance tasks.
Also known as:
Engine flywheel, ignition flywheel, magneto rotor, flywheel rotor, cooling fan flywheel, crankshaft flywheel. These terms refer to the rotating component that stores inertia, drives cooling airflow, and carries the ignition magnets in small two‐stroke engines.
Fits Models:
021, 023, 025, MS 210, MS 210 C, MS 230, MS 230 C, MS 250, MS 250 C, MS210, MS210C, MS230, MS230C, MS250, MS250C
Alternate Part Numbers:
1123-400-1203, 11234001203
Product Specifications
| L&S Part No. | 1123 400 1203 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 11234001203 |
| Unit of Sale | 1 |
| Applications | 021, 023, 025, MS 210, MS 210 C, MS 230, MS 230 C, MS 250, MS 250 C, MS210, MS210C, MS230, MS230C, MS250, MS250C |
| Machine Type | Chainsaws |
| Fits Brands | Stihl |
| Fits Models | MS230, MS230C | MS250, MS250C | 021, 023, 025 |
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