DENSO 4085 U-Groove Spark Plug - X22EP-U9

The DENSO 4085 U-Groove spark plug (X22EP-U9) is a premium standard nickel spark plug engineered for superior ignition performance and reliability. This traditional spark plug features DENSO's innovative U-Groove ground electrode design that creates a larger spark nucleus at the point of ignition, delivering improved ignitability and more efficient combustion.

Key Features:

• U-Groove channeled ground electrode generates greater spark energy than conventional plugs
• 12mm thread diameter with 19mm (0.748 inch) reach and gasket seat
• Copper core center electrode for superior thermal conductivity
• Nickel electrode tip material provides reliable performance
• Purified alumina insulator prevents flashover and voltage loss
• 5-rib insulator design reduces voltage loss
• 360-degree laser-welded construction for maximum durability
• Dual copper and glass seal creates gas-tight bond
• 100% pre-fired to ensure reliable operation
• Precision machine-rolled threads prevent seizing in aluminum heads
• Heat range 22, resistor type
• 18mm hex size, 17 Nm tightening torque

The U-Groove design allows for improved firing without increasing the spark plug gap, resulting in enhanced fuel efficiency, better throttle response, and lower emissions. This spark plug is original equipment in many automotive and powersports applications including BMW, Kawasaki, Suzuki, and Yamaha vehicles. Built to DENSO's strict OEM standards, this plug lasts twice as long as conventional spark plugs.

Note: This spark plug features a threaded terminal stud and does not include a terminal nut. If a terminal nut is required, order DENSO part number 067606-0051 separately. Sold individually.