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6B4-85520-00 6B4-85520-00-00
PREMARINE
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1. Technical Specifications
| Parameter | Specification / Detail |
| Component Type | Marine Stator Ignition Charge Coil / Magneto Exciter Coil |
| OEM & Interchange Part Numbers | 6B4-85520-00-00 / 6B4-85520-00 |
| Installation Location | Beneath the flywheel on the stator bracket plate (Generator / Magneto section) |
| Engine Platform | Inline-2 Cylinder 2-Stroke 246cc Marine Outboard Engines (Yamaha 6B4 series) |
| Horsepower Range | Yamaha 9.9HP and 15HP 2-Stroke models (9.9D, 15D, E9.9D, E15D Enduro series) |
| Resistance Specification | Standard cold DC resistance approx. $250\text{--}350\ \Omega$ (nominal at 20°C, refer to factory manual) |
| Winding & Insulation | Class H (180°C+) polyester-imide copper magnet wire with vacuum epoxy varnish |
| Lead Harness | High-flexibility oil-resistant color-coded wires with factory-style bullet terminals |
2. Key Features & Functionality
Efficient Electromagnetic Induction: Wound with laminated high-permeability core laminations, generating high peak output voltage even during slow manual recoil pulling for instant starting.
Vacuum-Impregnated Epoxy Insulation: High-temperature vacuum resin impregnation prevents moisture intrusion, dielectric flashover, and internal short circuits under humid marine conditions.
Vibration-Damped Lead Terminations: Lead wires are secured with reinforced strain relief boots, preventing wire fatigue and terminal pull-out caused by two-stroke engine harmonics.
Precision Core Air Gap: Mounting centerlines and core arc radii conform strictly to Yamaha 6B4 stator specifications, ensuring an accurate, non-contact air gap relative to the flywheel magnets.
3. Compatible Models
Primarily compatible with Yamaha 2-stroke 9.9HP–15HP engines on the 6B4 platform:
Yamaha 2-Stroke Series: 9.9D, 15D, E9.9D, E15D (standard recreational and commercial Enduro editions)
Clone Engines: Compatible with Parsun (6B4-type T9.9 / T15), Hidea (HD9.9 / HD15 6B4 version), Powertec, Seapro, and other outboard brands utilizing the Yamaha 6B4 electrical system
4. Aftermarket & Brand Compatibility
OEM Brand Fitment:
Yamaha Marine: Designed for genuine Yamaha 9.9HP/15HP (6B4 platform) magneto charging and CDI exciter systems.
PREMARINE Brand Aftermarket Replacement:
PREMARINE Quality Standard: PREMARINE specializes in high-reliability marine ignition electronics, stators, trigger sensors, and coils. This charge coil is manufactured using automated CNC winding tension controls and Class-H insulated copper.
Direct OEM-Level Performance: DC resistance tolerances, output peak DVA voltages, and thermal cycling endurance match or exceed OEM specifications, serving as the premier cost-effective choice for resolving no-spark or high-speed misfire issues.
5. Common Symptoms & Troubleshooting
Complete Loss of Spark / Engine Will Not Start (No Fire at Plugs):
Cause: Open circuit from burnt/broken winding wire, or internal breakdown of ground solder connections.
Troubleshooting: Disconnect the charge coil leads from the CDI; measure resistance across the leads with a multimeter. If reading shows infinite resistance (open) or near zero (dead short), replace the coil.
Engine Starts Cold, Stalls Hot After 10–15 Minutes, Runs Again After Cooling:
Cause: Thermal breakdown of magnet wire insulation; thermal expansion under engine heat causes inter-turn shorting.
Troubleshooting: Immediately test charge coil resistance when the engine stalls hot; if resistance drifts significantly outside factory specifications, the coil has suffered thermal breakdown and must be replaced.
Smooth Idle but Engine Bogs/Stumbles at Wide-Open Throttle (High-RPM Misfire):
Cause: Degraded coil winding unable to generate the necessary peak AC voltage to satisfy high-RPM CDI discharge demands.
Troubleshooting: Measure charge coil output using a DVA (Direct Voltage Adapter) meter during operation; if peak voltage fails to meet factory minimum thresholds (typically $<100\text{--}150\text{ V}$ at speed), replace the charge coil.
OEM Part Numbers
Compatible OEM references include:
6B4-85520-00
6B4-85520-00-00
Compatible Engine Models
This Charge Coil is primarily designed for:
2-Stroke 9.9/15HP
If you are unsure about compatibility, please provide your engine model number or identification plate for verification before ordering.
Applications
This Charge Coil is commonly used for:
Outboard engine repair
Engine rebuilding projects
Marine maintenance workshops
Boat fleet maintenance
Commercial fishing vessels
Recreational boats
Marine spare parts distribution
