YP100 Ignition Coil + Cap Spark Plug

🔥 Yamaha 100 Ignition Coil

📦 Part Number: MIYP100-5078

⚙️ Ignition Coil / Spark Plug Wire · JOG 100cc Scooter

📍 Installation Position: Engine Exterior · Near Frame

✅ High-Quality Insulation · Stable High-Voltage Output · Includes Spark Plug Cap · Direct Replacement

This product is a Yamaha 100 Ignition Coil, part number MIYP100-5078. It is a replacement ignition coil (with spark plug high-tension wire) specifically designed for JOG 100cc scooters and GY6 series 4-stroke engines — a core component of the ignition system.

The ignition coil transforms the battery's 12V low voltage into tens of thousands of volts of high voltage, which is delivered through the spark plug wire to the spark plug, generating a spark to ignite the air-fuel mixture. With extended use, ignition coils may fail due to insulation aging, internal shorts, or open circuits, resulting in hard starting, poor acceleration, unstable idle, or stalling while riding. This ignition coil features high-quality insulation materials, stable high-voltage output, and comes complete with a spark plug high-tension wire and spark plug cap — providing a perfect replacement to restore strong ignition performance.

• ⚡ Stable High-Voltage Output: High-quality iron core and primary/secondary windings ensure ample, stable ignition energy across all RPM ranges.
• 🛡️ Excellent Insulation: Coil is fully encapsulated with high-temperature epoxy resin; HT wire features premium silicone insulation to prevent leakage and breakdown.
• 🔌 Complete HT Wire: Includes spark plug high-tension wire with optimal length and core resistance matching OEM specifications for stable signal transmission.
• 🔧 Includes Spark Plug Cap: High-quality spark plug cap provides a secure, waterproof, and dustproof connection to the spark plug.
• 🔄 Direct Replacement: Mounting bracket, terminals, and HT wire length match OEM — installs without any modifications.

✅ Typical Signs That Ignition Coil Replacement Is Needed:
• Engine hard to start — both cold and hot starts are difficult.
• Poor acceleration, hesitation, or lack of power at high speed.
• Unstable idle, tendency to stall.
• Weak or no spark at the spark plug.
• Cracks, burn marks on the coil housing, or damaged HT wire insulation.
Replacing a failed ignition coil promptly restores strong engine power, improves fuel economy, and prevents catalytic converter damage from misfires.

✅ Installation Tips:
1. Disconnect the battery negative terminal before installation for safety.
2. Mark the wire connections before removing the old coil for reference.
3. Clean the mounting bracket and ensure a good ground connection.
4. Install the new coil and connect the low-voltage wires per the original wiring (pay attention to polarity).
5. Firmly insert the HT wire into the coil's high-voltage output terminal and screw the spark plug cap onto the spark plug.
6. After installation, start the engine and check for leakage (observe for blue corona glow in the dark).
Professional installation by a qualified technician is strongly recommended. Improper electrical system installation may cause coil damage or fire risk.

⚠️ Important Notice: This product is a Yamaha 100 Ignition Coil, part number MIYP100-5078. Suitable for 12V JOG 100cc and GY6 series 4-stroke engines. Mounting bracket type, HT wire length, and terminal connections may vary across different model years and versions. We recommend confirming your original coil specifications before purchase. Images are for reference only; actual product may vary.