[Jeff Higgins]

That was a very popular combination back in the day, and remains so today. "Sportons", Sportster motors in Featherbeds, are another popular combination.

Interesting story behind that. This is from an acquaintance who races a vintage sidecar down in your neck of the woods. A big bore stroker Sportster running on methanol of all things. Anyway, he tells me that the Triton was spawned because Triumph couldn't build a frame, and Norton couldn't build a motor. The Norton motor was notably powerful, but notoriously fragile when pushed to its limits in racing. The Triumph mill addressed that problem. He tells me the combination is even legal for vintage racing, it became so ubiquitous in its day.