Allen Millyard has created several unique motorcycles. One of those is a Kawasaki H2 Mach IV built in 2003. The motorcycle was originally powered by an air-cooled 748 cc 3-cylinder motor. Allen swapped that for a custom 1000 cc inline-four he made by combining two engines. The motorcycle has been owned by a friend for 20 years. Allen recently went over the engine and drive the motorcycle.
Source: Allen Millyard
I sure would love to own this beast. A 4 cylinder version of an RZ350 Yamaha would also be something else I’d like to see him build.