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A friend of mine who's a great guy but a real pack rat, gave me this top end a few years ago. He said he thought it was a Yamaha...if so it'd be a pretty early YZ400. I may be mistaken, I'm fairly certain they were first to have reed intakes, and it's got a big reed cage port.
The casting numbers at the base of the cylinder read 397cc on one side, and 51000 and the other. What really puzzled me was this: check out the weird circular smaller port above the exhaust poor. WTF is up with that? Can anyone here identify this positively?

Edited by - Quicklimegirl on Jan 09 2007 06:18:44 AM
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