Denso Copper Core U-Groove Spark Plug for 1970-1985 Yamaha XS650

Denso Copper Core Non-Resistor U-Groove Spark Plug for 1970-1985 Yamaha XS650

Finding plugs without built-in resistors can be difficult in the modern age. That's a setback for those working on motorcycles like the XS650 that can be sensitive to ignition voltage, but Denso is still making plugs for XS owners.

• 14mm thread, 3/4" (19mm) reach, gasket seat, 13/16" hex
• Denso heat range 22 is same heat range as the factory BP7ES
• Projected insulator tip sits deeper in the combustion chamber, so it reaches self-cleaning temperature sooner and resists fouling around town
• Patented U-groove ground electrode gives the flame kernel a pocket to grow in for a larger flame front and a more complete burn
• Copper-core center electrode with nickel-alloy tip and ground strap
• Non-resistor construction like the original BP7ES
• Run resistor plug caps or suppression-core wire to keep ignition noise out of electronic ignitions and accessories
• Sold each

There’s nothing exotic here. That’s the point. This Denso copper-core plug is the equivalent to the factory heat range. Plugs on a parallel twin come out in five minutes—cheap and frequent beats expensive and forgotten. Pick up a few! Sold each.