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The Yamaha RZ250, launched in 1980, was a stunning supersport that brought the water-cooled engine of the production racer TZ250 and expansion chambers derived from racing machines to a road-going two-stroke.
The RZ250 is the crystallization of a will that deliberately refused to let the two-stroke end, in an era when it was said to be finished. Bringing a water-cooled engine and expansion chamber inherited from the TZ250 down into a production bike, that decision is itself the fork in history. Seen against the headwind context of regulation, it becomes clear that it was resolve, not technology, that moved the era. It's fair to say the two-stroke culture of later years began right here.
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Touring on a two-stroke was pure hell, but the sound alone made it worth it.
It's overglorified as a legendary bike - in reality it was peaky and hard to ride.
That peaky power delivery is exactly the point - that's the RZ's whole appeal.
What's so impressive about an expansion chamber?
A device that uses the two-stroke exhaust chamber shape to supercharge the flow - that's what makes it rev up so hard.
Putting the water-cooled tech from the TZ racer into a production bike back in 1980 was just insane.
Bringing racer tech down to the production bike back in that era was a bold call.
A TZ-derived water-cooled two-stroke is pure romance.
The RZ250 was a genuine revolution - the original 750cc-slayer.
![The RZ250 Was a Two-Stroke Revolution, Sharing the TZ's Water-Cooled Engine and Chamber [Classic]](https://ebcyllahemayvlukmyyw.supabase.co/storage/v1/object/public/article-images/f21d97e3-6f34-4ea8-996c-d37e790dea96.webp)
