He's done a stack of these, sold most of them to the Japs. They love him in Tokyo ! In all capacities from S1-250, S2 350 S3 400, H1 500 and H2 750.
His "best" conversion was an S3 400, which he added another 2 cylinders to to make a
666 
5 cylinder........
My favourite was the 1000cc 750-3, which went out to the full 1 litre with another pot added. Apparently it was really easy to build and ride, went like stink, but a *tad* thirsty....
He has also done 4-cylinder versions of the smaller capacity triples, I don't think he went to 6-cylinder versions with the 2-strokes.
