C100 Starter Relay Assy

C100 Starter Relay Assembly

⚡ Starter Relay · Solenoid Switch · Electric Start Component · Electrical System

For Moped, Cub & ATV · Fits 139FMB, 147FMD, 147FMF, 150FMG engines

This is the C100 Starter Relay Assembly (also known as starter solenoid), a critical control component of the electric start system. It is suitable for Mopeds, Cub series, and ATVs, and fits engines including 139FMB, 147FMD, 147FMF, 150FMG, and similar models.

The starter relay is an electrical switch that opens and closes under the application of a second electrical circuit. When the start button is pressed, the relay coil energizes, creating a magnetic field that closes the contacts, allowing high current from the battery to flow to the starter motor, cranking the engine. Manufactured with high-quality copper contacts and a durable electromagnetic coil, this relay offers reliable contact, long service life, and heat resistance. This assembly is the ideal replacement when the original relay shows signs of contact burning, coil failure, or poor engagement.

Relays are commonly used in the gas scooter industry. A relay is an electrical switch that opens and closes under the application of a second electrical circuit. In basic operation, the relay controls an output circuit of much higher power than the input circuit. A relay allows the controls for the high power circuit to be made with lower capacity wiring and switches.

This starter relay assembly fits the following engine models:

• Mopeds - Electric start 50cc-150cc moped models (underbones, scooters, etc.)
• Cub Series - Honda Cub electric start models and clone models
• ATVs - Electric start small-engine quad bikes / kids ATVs
• Dirt Bikes - Electric start small off-road motorcycles
• Other vehicles using 139FMB, 147FMD, 147FMF, 150FMG engines with electric start

• No Response When Pressing Start: Relay coil not energizing or contacts not closing; starter motor doesn't turn.
• Clicking Sound but Motor Doesn't Turn: Relay engages but contacts are burned or corroded, unable to carry high current.
• Starter Runs Continuously: Contacts welded together; motor continues running after button released.
• Slow Cranking: Oxidized or worn contacts cause high resistance, reducing current to starter.
• Excessive Relay Heat: Poor contact causes overheating; may lead to relay failure.
• Blown Fuse: Internal short circuit or coil damage causes excessive current draw.
• Unusual Noise During Starting: Buzzing or vibration indicates unstable engagement.

If you experience these symptoms, inspect the starter relay and starter circuit, and replace if necessary.

• OEM Specifications: Manufactured to original electrical parameters and mounting dimensions for perfect fitment.
• High-Quality Copper Contacts: High-purity copper contacts for excellent conductivity and arc resistance.
• Strong Electromagnetic Coil: High-quality copper windings provide strong pull force and responsive operation.
• Sealed Dustproof Design: Enclosure provides protection against dust and moisture for harsh environments.
• High Current Capacity: Contact rating up to 100A-150A, meeting starter motor requirements.
• Direct Replacement: Directly replaces faulty original starter relay without modification.

🔧 Installation Tip

1. Disconnect the battery negative terminal before replacing the starter relay to prevent short circuits.
2. Verify relay type and terminal configuration matches the original (2-pin or 4-pin).
3. Note terminal labels: Typically "B" connects to battery positive, "M" connects to starter motor, small terminals connect to control wires.
4. Ensure all connections are tight and secure to prevent loose connections and overheating.
5. Mount the relay away from heat sources and moisture; ensure adequate ventilation.
6. Reconnect battery negative terminal and test the starting function.
7. Check for abnormal noise or excessive heat during relay operation.
8. If starting issues persist after replacement, inspect starter motor, battery, and wiring.

⚠️ Important Notice: This is a C100 starter relay assembly, suitable for Mopeds, Cubs, ATVs, and vehicles using 139FMB, 147FMD, 147FMF, 150FMG engines with electric start.
How It Works: A relay is an electrical switch that opens and closes under the application of a second electrical circuit. It controls an output circuit of much higher power than the input circuit, allowing the controls for the high power circuit to be made with lower capacity wiring and switches.
Installation Notes: Verify terminal configuration before installation. Always disconnect battery negative terminal when working on electrical systems. If starting issues persist after replacement, inspect starter motor, battery, and wiring. Images are for reference only. The actual product may vary.