447 motors - why so good?

vmaxjim

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Hi folks,
First post here, had a 1979 XS650 twenty or so years ago and always said I`d buy another, so on the lookout now.

I fancy a 1973 or 74 TX650, it seems, from what I`ve read, that the 447 motors are popular and highly regarded, why is that? What are the main differences between the 447 motors and others?
Thanks.
 
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