That's exactly like the one we had. See how the exhaust pipe comes out of the head and then transitions into an expansion chamber? From there, it necks down to a small pipe and then feeds the muffler. That design is just like the Yamaha two-stroke.
I agree with Kato; the valves will need some love.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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