Question about the CB

[benjixt]

Hello evry body
i've got a question
in my uper case there is writing 917 in Pen Black the case has never been open before me?
what that mean?

is it The “month/day” notation after the engine number is the date the upper crankcase was cast?

thanks to your reply
Benji

[Wayne]

Have a look here Benji. I asked the same question.

http://cb750sandcastonly.com/smf_forum/index.php?topic=335.90

[fasturd]

I have these marks on quite a few of my original CBs. Both 750s and CB400Fs They are in English as well. Usually on the rear of the engine case facing the rear wheel.

I couldn't make any sense of them either.

I clean around them and try and save them for originalitys sake.