Tech - Spark Plugs

Denso Spark Plugs


Norton Model

Denso Plug

850cc Commando Interstate and Roadster W22EP-U
750cc Commando Fastback, Commando S, Commando Roadster W22EP-U
745cc Atlas/Ranger P11A W24EP-U
650cc Dominator, Mercury ,Manxman W22ES-U
600cc 19R, 19S, 77, 99 OHV W20ES-U
596cc Big 4 SV W20ES-U
500cc All Models 19.0 mm (3/4”) Heads W22ES-U
500cc ES2 OHV 12.7mm (1/2”) Heads W22FS-U
500cc 19.00 mm (3/4”) Heads W22ES-U
500cc 88SS (OHV) W22ES-U
500cc 16H SV W20ES-U
499cc 30 (OHV) W24ES-U
490cc 500T (OHV) W20ES-U
384cc ES400 W22ES-U
350cc 40 (OHV) W24ES-U
350cc 50 (OHV) Twin Navigator W22ES-U
  Source: 2013 Denso Corporation  


  Where they will fit I prefer to use the EP-U variant with the projected nose.  
  "Use a spark plug that has a standard heat range. If this type of spark plug is used for traveling at low speed or over short distances (resulting in the occurrence of carbon fouling) it is recommended that you use spark plugs that have a low heat range." eg go from a W22 to a W20  
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