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Just a way Honda used to identify different "series" of the same model.
Normally a new K-series has serial numebrs that start with a different number.
Usually there were cosmetic changes, sometimes actual mechanical changes.

For instance -

CB450 K4- VIN starts 410XXXX
CB450 K5 - VIN starts 500xxxx

etc....

I use this source to figure it all out, it's pretty accurate - this has been posted here before...

http://www.motorera.com/honda/index.htm
 

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Bill, Great link. I was wondering how many bikes were sold after the "year of manufacture"? I have a '71 SL100K1 that is an original titled '72. Also, when looking at pictures of '73 350G models some of them do not have the disc brakes and front forks that are G model characteristics.Could they be K4 models titled as '73s? Thanks-Larry
 

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ol55 said:
Bill, Great link. I was wondering how many bikes were sold after the "year of manufacture"? I have a '71 SL100K1 that is an original titled '72. Also, when looking at pictures of '73 350G models some of them do not have the disc brakes and front forks that are G model characteristics.Could they be K4 models titled as '73s? Thanks-Larry

In those days a lot of states titled bikes in the year they were sold, not the year they were produced.
The only real way to determine is by the VIN.....
 
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