CVP now stocks NGK spark plugs for many Harley models, including early models. This includes both the popular standard nickle plugs and performance Iridium plugs.
For early models or those using point ignitions we recommend a standard plug. Iridium plugs are best suited for bikes with electronic ignitions due to their fixed gap.*
We have used NGK plugs on our bikes for years and feel they provide outstanding performance for V-twins.
* Note: never attempt to gap Iridium spark plugs as this will damage the electrode.