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CB750 heritage question

This is a discussion on CB750 heritage question within the Vintage forums, part of the Types of Bikes category; Hi all, I am a new member and have a serial number question about a Honda CB750 bike that I ...

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Old 09-27-2010   #1
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Join Date: Sep 2010
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Default CB750 heritage question

Hi all,
I am a new member and have a serial number question about a Honda CB750 bike that I have a chance to purchase. In checking out the bike and looking for problems, I found what I believe is an engine/frame discrepancy.
The frame serial number is CB750K-2701897 and shows a 1977 date, while the engine has the serial number CB750E-3009641 which makes it a 1978 model according to the serial number information on this site.
My question is, is there any reason that Honda would do something like this at manufacture? Are the serial numbers listed at this site incorrect, which doesn't seem likely? Or do you all think that someone blew up the original engine and found a newer engine and installed it as a replacement? The seat is also of the two step design of the 1978 series or newer. If I bought this bike, I would do so to bring it back to original. With this bike not having matching numbers, I would think it would have little value. Is this true?
Thank you for your help.
Rick Hunt

Last edited by jeepster; 09-27-2010 at 06:25 PM.
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