Description & Size Guide
Single Fire / Dual Fire Ignition Module 70-99 B.T.
Works with single and dual fire ignition set-ups. Features 14 advance curves from stock to extreme and an adjustable rev. limiter. VOES imput option and tachometer output. Front cylinder static timing with a L.E.D. light for easy set-up. Note: The difference between single dual fire explained: - Dual fire - This is the way the earlier, pre-Twin Cam, engines work. A single coil is used and both spark plugs fire simultaneously. This is the simplest system. The 'wasted' spark is sometimes said to be horsepower robbing. - Single Fire - This is the way the stock 00-up Twin Cam engines work. Two separate coils will fire the spark plugs independently and only the spark plug of the cylinder that is on compression stroke will be fired. It is said that these engines vibrate less and can improve power. The effects will become more pronounced with hotter cams and higher RPM.70-99 B.T. (excl. Twin Cam, excl. injection); 71-03 XL (NU)
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This quick reference fitment information is provided to direct you to the manufacturer's information. Consult manufacturer publication(s) and/or website(s) for specific fitment and application information and other important information. This fitment information is based upon the stock version of the motorcycle or unit referenced and any accessory added or other modification could invalidate the quick reference information provided.
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