Articles tagged with: twin plug
Harley-Davidson Dual 10mm Spark Plug Head
The right way to convert a cylinder heads to twin plug!
The jig that is generally available to Harley-Davidson workshops and tuners, used to convert Harley-Davidson heads to a twin spark plug set up does not provide the best solution. Whilst this promises a performance increase, the end result is not the best regarding plug position in relation to the flame …
Twin Plug Conversions
The image to the right is an example of what can be achieved, a Triumph T120 oppositional-angle, twin-plug conversion. Such twins cylinder heads cost from £65.00. Other options offered by the Cylinder Head Shop include the use of an offset vertical relocation of the spark plugs and the use of 8mm or 10mm plugs.
Heads previously considered beyond twin-plug modification …
