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Tag is on the right side of the steering neck. Shows Vin, model, size cc, month built, year built, and year of bike. Year being mid year change building for the new model change. So tag says year is a CB400T '1981 in printed bold numbers.' So that says somewhere mid/late year 1980 stamped, but sold as an '81.
 

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Discussion Starter · #4 ·
Tag is on the right side of the steering neck. Shows Vin, model, size cc, month built, year built, and year of bike. Year being mid year change building for the new model change. So tag says year is a CB400T '1981 in printed bold numbers.' So that says somewhere mid/late year 1980 stamped, but sold as an '81.
Are you the one selling this?
 

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Go onto CMSNL.com with info given and find it, to compare stuff like side panels, tank, indicators and exhausts as well as other stuff you can see in the posted picture....

That way you can suss out how "original" it may be, if originality is your thing.
 

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Are you the one selling this?
I am. An example: When you see the engine number(s) along side a part number, it's says: fits up to this engine-number. So to look at the life cycle of a certain engine family, I'll use the CB750 from its intro in 1969 to the end of the engine family in 1978.

So as each subtle changes you don't see happening internally and externally, would be the oil feed update beginning in some year say '74-'75 is the guess?

An oil screen plug was used first year. The oil to the top end filtered through a plug that was between the head and cylinder. Those would finally clog up with cotton felt from the gloves they used to assemble the engine. So early years would seize the top end and the cotton glove was the cause.

Thus the mid year change becomes new design changes. They machined the same cast head, and cylinders but with a new oil restrictor and that was a tube that looked like a carb emulsion tube with holes drilled, eliminating a screen.

Even though the engine family did not change till 1979 into a twin cam, the factory engineers have teams to improve the original design, by seeing the field fixes thru warranty, or improvements you just do not catch, but is on going to this day.

Have I got you sold now?

Signed,
NOLTT (no one listens to turtle)
 
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