 |
6N7-81840-00 6N7-81840-00-00 6E5-81840-00
PREMARINE
| Quantity: | |
|---|---|
1. Technical Specifications
| Parameter | Specification / Detail |
| Component Type | Outboard Starter Motor Brush Holder Plate Assembly |
| OEM & Interchange Part Numbers | 6N7-81840-00-00 / 6N7-81840-00 / 6E5-81840-00 |
| Starter Motor Platform | Hitachi S114-651 / S114-651A series 4-pole marine starter motors |
| Installation Location | Rear end-frame of the starting motor, encircling the commutator (Starting Motor chapter) |
| Engine Platform | 90° V4 and 60°/90° V6 2-Stroke Marine Outboard Platforms |
| Horsepower Range | Yamaha 115HP, 130HP, 150HP, 175HP, 200HP, 225HP, and 250HP 2-Stroke models |
| Brush Configuration | Heavy-duty 4-brush quadrant design (2 insulated positive brushes + 2 grounded negative brushes) |
| Material Composition | High-copper sintered metal-graphite brushes + stainless steel coil springs + phenolic base |
| Current Handling | Engineered for instantaneous cold-cranking bursts of $200\text{--}400\text{ A}$ under high cylinder compression |
2. Key Features & Functionality
4-Brush Low-Resistance Design: Balances heavy starting currents evenly across the commutator surface, minimizing voltage drop and preventing severe contact arcing under high cranking compression.
Dielectric High-Heat Insulating Base: Molded from heavy-duty thermoset resin that resists arc breakdown, warping, and oil softening under severe thermal operating conditions.
Constant-Force Stainless Springs: Marine-grade stainless steel springs maintain uniform contact pressure against the commutator bars as the brushes wear down, preventing high-RPM contact bounce.
Flexible Multi-Strand Shunt Wires: Braided ultra-fine oxygen-free copper pigtail leads with flame-retardant sleeves withstand intense engine harmonics without work-hardening or snapping.
3. Compatible Models
Specifically tailored for Yamaha 2-stroke V4 and V6 outboard engines:
Yamaha 2-Stroke V4 Series: 115HP (115B, 115C), 130HP (130B)
Yamaha 2-Stroke V6 Series: 150HP (150F, 150G, ProV 150), 175HP (175D), 200HP (200F, 200G), 225HP (225D), 250HP (250G)
Clone/Platform Applications: Suitable for Parsun, Hidea, and other marine outboards utilizing the Yamaha 6N7 / 6E5 style starter motor layout
4. Aftermarket & Brand Compatibility
OEM Brand Fitment:
Yamaha Marine: Designed for genuine Yamaha 115HP through 250HP V4/V6 starter motor repair and brush replacement.
PREMARINE Brand Aftermarket Replacement:
PREMARINE Quality Standard: PREMARINE specializes in high-reliability marine electrical systems, brush plates, starter drives, and solenoids. This assembly is manufactured using precision tooling and optimal copper-carbon sintering.
Direct OEM-Level Performance: Brush wear rates, spring tensions, and insulation resistance meet or exceed OEM specifications, offering an economical solution to rebuild the original starter without purchasing a complete motor assembly.
5. Common Symptoms & Troubleshooting
Starter Fails to Turn / Solenoid Clicks Loudly but Engine Does Not Crank:
Cause: Brushes worn past the minimum service limit; springs bottom out, breaking the electrical connection to the commutator.
Troubleshooting: Disassemble the starter rear cover and inspect brush length; if worn to or below the wear limit mark, replace the brush holder assembly.
Sluggish Cranking / Starter Housing Overheats and Emits Smoke:
Cause: Copper-carbon dust accumulating across the base plate creating an insulation breakdown/short to ground, or brushes sticking in slots.
Troubleshooting: Clean out dust and test insulation resistance between the positive brush terminal and the metal baseplate; if continuity is detected, the base is heat-charred and must be replaced.
Intermittent Starting / Starter Only Spins After Tapping the Casing:
Cause: Brushes binding inside their guide boxes due to salt-air corrosion, grease, or brush dust buildup.
Troubleshooting: Check free movement of brushes within the guide holders; if brushes bind or springs have lost tension from thermal fatigue, install a new brush holder assembly.
OEM Part Numbers
Compatible OEM references include:
6N7-81840-00
6N7-81840-00-00
6E5-81840-00
Compatible Engine Models
This Brush Holder Assy is primarily designed for:
2-Stroke 115/130/150/175/200/225/250HP
If you are unsure about compatibility, please provide your engine model number or identification plate for verification before ordering.
Applications
This Brush Holder Assy 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
