Those rotary valve Can Ams were wicked fast back in the day. I grew up in a small town in southeastern Ohio. There was a Suzuki/Can Am dealer in town and the owner's son was a local pro motocross rider. He rode a Can Am 250 and consistently holeshot almost every moto against the Japanese and Euro bikes.
Not only are the motors fast, they’re super reliable too! I rarely have motor problems on the canams. They have some odd chassis design flaws but once you know what to look for it’s not terrible