You may like this, Kawasaki Z1 6 cylinder engine.
For those that don't know, the Kawasaki Z1 is a 4 cylinder, air-cooled, DOHC, carburetted, chain-drive motorcycle introduced in 1972. Together with the Honda CB 750 it finished off the British motorcycle industry, which was woefully outdated, the best it could do was twin cylinder ohv engines.
The series of videos by Allen Millyard shows how he made a 6 cylinder engine from two 4 cylinder engines.
https://www.youtube.com/playlist?list=PLop2HGVepi07H_Y7iT2VtXaiWZYRIhowW
For those that don't know, the Kawasaki Z1 is a 4 cylinder, air-cooled, DOHC, carburetted, chain-drive motorcycle introduced in 1972. Together with the Honda CB 750 it finished off the British motorcycle industry, which was woefully outdated, the best it could do was twin cylinder ohv engines.
The series of videos by Allen Millyard shows how he made a 6 cylinder engine from two 4 cylinder engines.
https://www.youtube.com/playlist?list=PLop2HGVepi07H_Y7iT2VtXaiWZYRIhowW