Yep a 1976 CanAm 500 dual rotary valve 2-stroke twin. Carbs and Rotary valves on top of the cases with downdraft carbs. Was a fast bike in its day but never went into production. It almost got there but pollution standards scared Bombardier so they dropped it. I saw two of the preproduction models close-up in 1975.
I have to laugh, just noticed theres 35 pages to this thread. 35! Just about engines. Thats pretty cool in my book.
Yes, two Ariel Square 4s linked together. I believe it was built by the legendary AJ Lewis. I was on Commando with the local Norton club years ago, and this bike blew around me in a long sweeper like I was stopped. It sounded like a top fuel dragster.
