Will a 1982 cb750/cb900 Super sport gas tank fit a 1982 cb450T?
Funny, earlier I had not thought about it but I had a CB900F I sold and yeah I had 750 and a 900 and both tanks were identical underneath like that.I tried the tank from my 73 CB750K on a spare CB400T frame once, it barely cleared the backbone but it just fit. In the photo below you can see the narrow area parallel to the petcock hole, that fit but was a tight slip fit on the CB400T frame. I'm not sure if it would require relocating the CDI or ignition coil, I didn't have those mounted on this frame at the time. I'm not sure if the later DOHC tanks had a wider tunnel or not, but I have seen DOHC tanks on SOHC fours.
Let's look at some pictures from eBay:
Here's a SOHC CB750K from 71-76
And a DOHC CB750 from 1982
The tunnel is much wider but the front mount appears narrower, not sure if it really is.