If memory serves, They learned about this idea from the Harley dirt track program. In the early eighties, and late seventies, the Japanese manufacturers wanted some of the American flat track scene. They couldn't figure out why the ancient Vs were waxing the twins and later the new Japanese V motors. Better Horsepower didn't seem to matter! When they analyzed what H-D had going, they saw essentially an inline twin with a huge hole in the power delivery. H-D motors were run for years with the ignition firing in both cylinders simultaneously. One was early and one was late. This lumpy delivery allowed the tire to regain traction in between power pulses. A handy feature on dirt!