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DENSO Standard Spark Plug [X22ESR-U] 4091

DENSO Standard Spark Plug [X22ESR-U] 4091


DENSO Spark Plug X22ESRU - Single Plug

Single Plug


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DENSO Standard Spark Plug [X22ESR-U] 4091

General Details:

Diameter [mm]12
Spanner Size18
Tightening Torque [Nm]17
Weight [g]40
Spark Plug1 - Earthed Electrode
Thread Length [mm]19

Additional Images:

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Please use our DENSO Spark Plug Lookup or contact us to find the right spark plug for your car

DENSO has been setting the standard for spark plug technology since 1959. They develop all of their ranges in-house, and manufacture them in their own ISO9000 certified factories worldwide - with 'zero defects' as standard. They also provide this outstanding OE quality to the aftermarket. Including Standard, Platinum and Iridium, DENSO Spark Plugs cover a complete range of continually updated references. Guaranteeing optimum engine performance, choose DENSO Spark Plugs for every automotive, motorcycle, marine and small engine application.

DENSO's Standard Spark Plug range features their pioneering, patented U-groove OE technology with nickel plated electrodes. Perfect for general motoring, this plug delivers superb plug ignition reliability, longer life and exceptional engine performance.

Spark Plug Health Check

Use Spark Plugs To Check Your Engine Health
Read More

Heat Ranges Explained

Learn what a spark plugs heat range means, and how it can effect your engine
Read More

Heat Cross Reference

Use our spark plug heat range cross reference table
Cross Reference Heat Range


  • Improved cold-starting
  • More efficient fuel consumption
  • Better engine performance and acceleration
  • Smoother idling performance and throttle response
  • Original equipment quality now available to the aftermarket
  • Plugs available for all applications
  • Develops a larger and hotter flame
  • Eliminates excessive fouling and erratic starts

Technical Information:

Tech Data:

  • Thread Ø: 12mm
  • Thread Reach: 19.0mm; 20.0mm (with gasket); 17.5mm (taper seat)
  • Hex Size:18.0mm
  • Heat Range: 22
  • Electrode Design: Non projected
  • Gap Configuration: U-groove in ground electrode
  • Resistor Built In: Yes

Compatible OE part: YAMAHA - 94701-00208

Compatible competitor part: NGK - DR7EA

PDF Downloads:

Download the Technical PDF

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