Description
The NGK BPMR7A (Stock #6703) is a resistor-type nickel spark plug designed for 2-stroke small engines and power equipment. Known for its durability and consistent spark, it’s widely used in chainsaws, trimmers, blowers, and other outdoor equipment where reliable ignition is critical.
Key Features
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10kΩ resistor reduces electrical interference (RFI/EMI)
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Nickel center electrode for dependable, long-lasting performance
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Copper core improves heat dissipation and conductivity
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Trivalent plating resists corrosion and prevents thread seizure
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Projected tip design enhances combustion efficiency
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Triple gasket sealing prevents combustion gas leakage
Specifications
General
- Part Number: BPMR7A
- Stock Number: 6703
- Heat Range: 7
- Resistor: Yes (10k Ohm)
- Gap: 0.7 mm (.028")
Shell
- Thread Size: M14 x 1.25
- Reach: 9.5 mm (3/8")
- Seat Type: Gasket
- Hex Size: 3/4" (19 mm)
- Terminal Type: Solid
- Overall Height: Bantam
Electrodes
- Center Electrode: Nickel (2.5 mm)
- Ground Electrode: Standard nickel
- Projection: Projected
- Configuration: J-gap
Common Applications
Powersports
- E-TON Viper Jr. (2002–2004)
Commercial / Industrial Engines
- Kawasaki TEX54
- Stihl KM55, KM85
- Tecumseh TC300, TCH300, H20
- U.S. Engine Products hobby engines
Lawn & Garden / Outdoor Equipment (very common)
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Chainsaws: Stihl (MS series, Farm Boss, Magnum, etc.), Husqvarna (XP series, Rancher, etc.), Poulan Pro, Echo, Dolmar, Makita, Jonsered
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Trimmers / Brush Cutters: Stihl FS series, Husqvarna 200/300 series, Echo SRM series
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Blowers: Stihl BR/BG series, Husqvarna backpack blowers
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Cut-off saws / power cutters: Stihl TS series, Husqvarna K-series
- Pole saws, augers, and more
Performance Notes
- Designed for 2-stroke engines, especially in outdoor power equipment
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Heat range 7 = medium-cool, suitable for higher-load engines
- Resistor helps prevent interference with ignition modules/electronics
- Typical service life: ~30,000 miles equivalent (or seasonal use cycles)
- Always verify gap (.028") and torque before installation