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Yamaha RD50 / RX50 Pulser Coil 4U5-85580-M0
Yamaha RD50 / RX50 Pulser Coil 4U5-85580-M0
Low stock: 2 left
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Product Description
Factory-original magnetic variable reluctance pick-up coil mounted directly to the internal stator backing plate. Measures flywheel rotation pulse and sends timing signal triggers to the CDI unit for precise spark ignition.
Technical & Electrical Specifications
| Feature | Specification |
| System Compatibility | 6V / 12V CDI Systems (Kokusan / Mitsubishi Stator Assemblies) |
| Coil Resistance | 100Ω – 120Ω @ 20°C (Measured between signal wire and ground) |
| Air Gap Tolerance | 0.4mm – 0.7mm (Distance between core tip and flywheel pulse tab) |
| Mounting Hardware | M4 Pan-head plate screws |
Expanded Vehicle Compatibility
Standard factory fitment across early 1980s Yamaha 50cc–80cc 2-stroke platforms:
| Make | Model | Model Code / Variant | Year Range |
| Yamaha | RD50 / RD50M / RD50MX | 4U5 / 2E0 | 1980–1986 |
| Yamaha | RX50 / Special / Special II | 5M2 | 1982–1984 |
| Yamaha | DT50MX | 1RE / 2NB / 3F4 | 1981–1987 |
| Yamaha | DT80MX | 5J1 / 22J | 1981–1984 |
| Yamaha | YSR50 | 560 (Early Japan Spec) | 1986 |
Fitment Details
Remove the flywheel side cover and use a dedicated Yamaha flywheel puller tool to lift the rotor. Desolder or release the terminal leads from the main stator wiring loom, unbolt the original coil from the base plate, and secure the replacement. Adjust the core air gap relative to the flywheel rotor tab before final assembly.
Important: Please ensure the part number matches your motorbike before purchasing. If you have any questions about the part or its compatibility, feel free to contact us. We’re here to help!
At Dmmotorcycles, we’ve specialized in vintage and vintage sports motorcycles and parts directly from Japan since 1998. We stock a wide selection of rare genuine and high-quality aftermarket parts and continually update our inventory to meet growing demand.
Looking for a specific part? Don’t hesitate to ask! We may have it in stock even if it’s not listed online. If not, we’ll do our best to source it for you.
We’re also happy to provide guidance on installation and offer excellent after-sales support to ensure your satisfaction.
Shipping Information
We ship worldwide, carefully inspecting and securely packing all parts to ensure safe delivery. Your order will be insured and shipped quickly, with the best available shipping option chosen for speed and reliability.
Please note:
- All parts are shipped from Cyprus (Europe).
- Customers outside the EU may incur additional import taxes based on the value of the item.
How we handle your order in 4 steps
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1. Order Verification
We confirm the order and make sure the correct part number, quantity, and any special requests match what’s on the sales confirmation
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2. Quality Check
Since our parts are new old stock we Inspect the parts for any defects, scratches, or missing components to ensure it meets quality standards. otherwise will notify you before proceeding with the order.
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3. Safe and Secure packaging
- Protective Wrapping: We use bubble wrap or foam padding to wrap the part, focusing on sharp edges or delicate components.
- Boxing: We place the wrapped part inside a sturdy box, filling gaps with packing materials to prevent movement.
- Sealing and Labeling: Securely tape the box and attach the shipping label, including orientation-specific markers like "Fragile."
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4. Finalizing of Shipment
We confirm the shipping address and contact details, give the package to the Post, keep the tracking number, and then send it to the customer along with the shipment notification.
