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Don't remember where I got this from but may be of help to others.Regards Chris.
 

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I have just begun to restore a 1972 cl450 and your posting appears to have settled one issue that I had. My frame and engine #'s do not match. They both fall into the series suggested by your posting, but the last two digits are 28 apart. Is this normal? I had assumed that the bike was a k5, but my frame number preceeds the 50008489 number in your posting. I am not sure if I have a mismatched engine/frame, or if this is normal for the year and make. Any help would be appreciated.
 

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back40mc said:
I have just begun to restore a 1972 cl450 and your posting appears to have settled one issue that I had. My frame and engine #'s do not match. They both fall into the series suggested by your posting, but the last two digits are 28 apart. Is this normal? I had assumed that the bike was a k5, but my frame number preceeds the 50008489 number in your posting. I am not sure if I have a mismatched engine/frame, or if this is normal for the year and make. Any help would be appreciated.

Hondas of this era almost never have matching frame/engine numbers.
I've only seen one in my whole life that had matching numbers....
 

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K5 series starts at CL450-5000001...The mentioned/posted serial has one too many digits....
A disparity of ONLY 28 would be far less than most examples....My CL has a 300+ difference between frame and engine numbers and is almost certainly all original....
 

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Thanks for the quick responses. I will sleep better tonight knowing that this is one less thing to worry about. This has been an issue with some of my other bikes and I just wanted to know early on that this is the way it came from the factory.
 
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