By "dual fire" I they probably are referring to a wasted spark ignition system. This is the type in which each coil fires 2 spark plugs simultaneously even though only 1 of the 2 cylinders is on the compression stroke. This is how the 4 cylinder Kawasaki KZ's work. Check with the seller to ensure that is what he means. Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
