Blue Line Ignition Coil w/ 18" Lead :139QMBand GY6 50/150cc
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Reliable Ignition: Blue Line GY6 50/150cc Ignition Coil
Restore your engine’s firing consistency with the Blue Line Ignition Coil Assembly. Engineered as a high-quality, OEM-equivalent replacement for the GY6 and 139QMB engine platforms, this coil is the solution for common electrical issues like weak spark, intermittent stalling, or "no-start" conditions. Whether you are maintaining a daily commuter or refreshing a project bike, Blue Line provides the factory-level performance you need without the premium price tag.
Technical Performance Features
- Complete Assembly: Includes a high-output two-pole coil, a heavily insulated 18-inch spark plug wire, and a reinforced 90-degree spark plug cap for a total ignition overhaul.
- Extended 18" Plug Wire: The generous lead length provides extra flexibility for custom mounting and ensures compatibility with "Long Case" scooters, where the coil is mounted further from the cylinder head.
- Weather-Sealed Cap: Features a thick rubber boot at the plug connection to prevent moisture and debris from grounding out your spark in wet riding conditions.
- Dual-Pole Connection: Designed for standard GY6 wiring harnesses, making this a true "plug-and-play" installation with no splicing required.
Comprehensive Fitment Guide
This ignition coil is compatible with 50cc, 125cc, 150cc, and 170cc 4-Stroke Engines. If your engine code includes "QM" or "FM", this part is a direct fit:
| Engine Type | Common Compatible Engine Codes |
|---|---|
| 50cc 4-Stroke | 139QMB, 1P39QMB, 139QMA, YN139QMB |
| 125cc/150cc | 152QMI, 157QMJ, 1P57QMJ, JJ157QMJ, BN157QMJ |
| 170cc / Stroker | 161QMK, 1P61QMK, BN161QMK-A |
Technical Specifications
- Wire Length: 18 Inches (457mm)
- Coil Type: 2-Pole (Primary/Ground)
- Spark Plug Cap: 90-Degree Resistor Style
- Brand: Blue Line (OEM-Equivalent)
Mechanic's Note: Ignition coils often fail when they get hot, leading to a scooter that runs for 10 minutes and then dies. Pro Tip: When installing this new coil, always pair it with a fresh NGK CR7HSA Spark Plug. A fouled or old plug can put unnecessary strain on your new coil, leading to premature failure.
SKU: 0900-1104
Original Parts For Scooters SKU 164-329, SKU 164-55
Vendor: Blue Line
Compatibility:
157QMJ-based 125cc / 150cc / 169cc engines with the following engine codes:
| 157QMJ | 161QMK | 152QMI | 1P61QMK |
| YN1P57QMJ | 1P52FMI | 154FMI | JJ157QMJ |
| 1P57QMJ | BN157QMJ | BN161QMK-A |
Shipping information
Orders are prepared as quickly as possible. Delivery times and shipping costs are calculated at checkout based on the destination and items ordered.
Returns & warranty
Please verify fitment and part number before ordering. Contact Thrifty Scooters promptly if an item arrives damaged or incorrect.