Description
Overview:
This flywheel is a genuine Stihl part (MPN 4237 400 1202) for HS-series petrol hedgetrimmers, including HS 81 R and HS 81 RC. It is a die-cast aluminium wheel with integral cooling fins and an embedded magnet that works with the ignition module. The flywheel stores rotational energy to keep the engine running smoothly, helps move cooling air across the cylinder, and provides the timing trigger for reliable spark. Replacing a worn, cracked, or damaged flywheel restores smooth running, easier starting, and consistent cutting performance. Designed for a precise fit on the original crankshaft taper and keyway, it maintains the correct balance and alignment required by Stihl two-stroke engines used in professional and domestic hedge trimming.
Key Features:
- Genuine Stihl OEM part (MPN 4237 400 1202) for assured compatibility and performance
- Die-cast aluminium construction with cooling fins for strength and heat dissipation
- Embedded magnet for stable ignition timing and dependable starting
- Precisely balanced to minimise vibration and protect engine bearings and crankshaft
- Direct replacement on compatible HS-series models; no modifications required
- Correct taper and keyway profile for secure seating on the crankshaft
- Durable, corrosion-resistant finish suitable for outdoor conditions
- Helps maintain smooth idle, clean acceleration, and consistent cutting results
Typical Applications:
Used to replace damaged or worn flywheels on Stihl HS-series hedgetrimmers in gardening, landscaping, grounds maintenance, and estate upkeep. Ideal for restoring reliable ignition timing, cooling airflow, and smooth engine operation on machines that see regular professional or domestic use.
Also known as:
Hedgetrimmer flywheel, engine flywheel, ignition flywheel, magneto flywheel, fan flywheel, rotor for ignition timing, replacement flywheel for HS-series trimmers.
Fits Models:
HS 81, HS 81 R, HS 81 RC, HS 81 T, HS 81 TC, HS 82, HS 86, HS 86 R, HS 86 T, HS 87
Alternate Part Numbers:
4237-400-1202, 42374001202
Product Specifications
| L&S Part No. | 4237 400 1202 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 42374001202 |
| Unit of Sale | 1 |
| Fits Brands | Stihl |
| Key Features | - Genuine Stihl part for HS-series petrol hedgetrimmers - Die-cast aluminium with cooling fins for heat dissipation - Embedded magnet ensures stable ignition timing - Correct taper and keyway for secure crankshaft fit - Fits HS 81, HS 82, HS 86, HS 87 models |
| Fits Models | HS81, HS86 | HS82 | HS87 |
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