NGK
Description
Keep your engine firing with the industry standard in ignition reliability: the NGK BPR7HS (Stock #6422). Engineered for 2-stroke engines, this high-quality copper-core spark plug delivers superior heat dissipation and consistent combustion. The integrated 5k Ohm resistor prevents electromagnetic interference with onboard electronics and digital displays.
Key Performance Features
- Superior Heat Dissipation: 98% pure copper core for increased conductivity, preventing overheating and extending plug life.
- Anti-Fouling Projected Tip: Projected insulator design prevents carbon buildup and misfiring—clean spark even during low-speed city idling.
- Corrosion Protection: Trivalent metal plating for superior anti-seizing properties—no anti-seize compound required.
- Flashover Prevention: Corrugated ribs on the alumina silicate ceramic insulator eliminate electrical leakage for a guaranteed spark every time.
Comprehensive Fitment Guide
This 14mm thread spark plug is the factory-recommended replacement for 2-Stroke 50cc–110cc engines:
| Models | Years |
|---|---|
| Genuine: Buddy 50, RoughHouse 50, Rattler 50/110, Black Cat | All |
| Yamaha: Jog 50, Zuma 50, Vino 50 (2T), BW80 Big Wheel | 1989–2011 |
| Aprilia: Mojito 50, SR50 Ditech | 1999–2004 |
| E-Ton: Beamer 50, Matrix 50, Viper 50/70/90 | All |
| Polaris: Sportsman 90, Predator 50/90, Scrambler 50/90 | 2001–2014 |
| Suzuki: Quadsport 80 (LT80) | 1987–2006 |
Technical Specifications
- Thread Size: 14mm
- Reach: 12.7mm (1/2 inch)
- Hex Size: 20.6mm (13/16 inch)
- Resistor Value: 5k Ohm
- Heat Range: 7
Maintenance Note: A fresh plug is the cheapest insurance for a reliable ride. Replace every 2,000 miles or at the start of every riding season to prevent starting issues.
Pro Tip: Check your spark plug wire! If your cap is cracked or loose, pair this plug with a new NGK 90° Spark Plug Cap (SKU: SPCAP) for maximum conductivity.
About NGK
NGK Spark Plugs is the world's leading manufacturer of spark plugs, with over 80 years of engineering excellence. Trusted by OEM manufacturers and professional mechanics worldwide, NGK sets the benchmark for ignition reliability across powersports, automotive, and marine applications.
Product Diagrams
Manuals / Install Instructions
Model Fitments
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Same day shipping for orders placed before 2PM (CST) M-F
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30-day return period on eligible items
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Flat-rate shipping for orders shipped to the 48 Contiguous United States.
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