Description
Overview:
The Key-Flywheel is a small, half‐moon steel key that locates the flywheel on the crankshaft of Makita cut-off saw engines. It prevents the flywheel from slipping on the shaft and keeps ignition timing accurate, helping the machine start reliably and run smoothly. Suited to petrol power cutters such as the Makita EK8100 and DPC6401, it replaces a worn or sheared key during routine maintenance or after an engine incident. Made from durable steel for repeatable seating and torque transfer, it is a simple but essential part for restoring correct operation. Supplied to match Makita specifications and references including 939 630 370, it fits a wide range of Makita DPC/DCS series saws as listed below.
Key Features:
- Steel half‐moon (Woodruff) profile for secure crankshaft seating
- Helps maintain correct ignition timing and smooth running
- Direct-fit design for Makita EK8100 and multiple DPC/DCS models
- Reliable torque transfer between crankshaft and flywheel
- Ideal replacement when the original key has worn or sheared
- Simple to install with basic hand tools during flywheel service
- Corrosion-resistant finish typical for long service life
- Cost-effective fix to misfiring, kickback timing shifts, or poor starting
- Matches Makita reference 939 630 370 for easy identification
Typical Applications:
Used during engine repairs, rebuilds, and timing checks on Makita petrol cut-off saws. Replace after a sudden stop, kickback event, or when diagnosing hard starting, backfiring, or timing drift. Suitable for routine flywheel removal/refit, crankshaft service, and preventative maintenance to keep site, workshop, or garden machinery dependable.
Also known as:
Woodruff key, half‐moon key, crankshaft key, timing key, magneto key, ignition rotor key, engine key for flywheel, cutter crank key.
Fits Models:
DCS9000-50, DCS9000-60, DCS9000-74, DCS9010-74, DPC6200, DPC6201, DPC6400, DPC6401, DPC6410, DPC6411, DPC6430, DPC6431, DPC7000, DPC7300, DPC7301, DPC7310, DPC7311, DPC7321, DPC7331, DPC8111, DPC8112, DPC8132, EK8100
Alternate Part Numbers:
939630370, 254042 8, 254042-8, 2540428
Product Specifications
| L&S Part No. | 939 630 370 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Makita |
| OEM No. | 254042-8 |
| Unit of Sale | 1 |
| Applications | DCS9000-50, DCS9000-60, DCS9000-74, DCS9010-74, DPC6200, DPC6201, DPC6400, DPC6401, DPC6410, DPC6411, DPC6430, DPC6431, DPC7000, DPC7300, DPC7301, DPC7310, DPC7311, DPC7321, DPC7331, DPC8111, DPC8112, DPC8132, EK8100, MOD |
| Machine Type | Disc Cutters |
| Fits Models | DPC6200 | DPC6430 | DPC7000 | DCS9000-50 | DCS9000-60 | DCS9000-74 | DCS9010-74 | DPC6410 | DPC6400 | DPC6430, MOD | DPC7301 | DPC7311 | DPC8132 | EK8100 | DPC6431 | DPC6201 | DPC6411 | DPC7300 | DPC7310 | DPC7321 | DPC7331 | DPC8111 | DPC8112 | DPC6401 |
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