Fuel tanks

Posted: Thu Mar 25, 2021 7:28 pm

I'm assuming there are no differences- mounting-wise between a 750 tank and a 900 tank.
The 750 tank is one that had the screwed-on side emblems. Is that the only difference?

Posted: Thu Mar 25, 2021 7:43 pm

There differences is petcock sizing. See: http://www.cb750c.com/Genesound/Petcocks_79-83_DOHC.html

Posted: Thu Mar 25, 2021 8:10 pm

I can't access that link- are the petcocks not interchangeable?

Posted: Thu Mar 25, 2021 8:40 pm

headless wrote:

There differences is petcock sizing. See: http://www.cb750c.com/Genesound/Petcocks_79-83_DOHC.html

That file went missing when the site crashed a while back.

Posted: Thu Mar 25, 2021 8:44 pm

rl750 wrote:

I can't access that link- are the petcocks not interchangeable?

The petcock threads changed size almost every year.

I think F tanks of the same year are the same, like an 80 900f will fit an 80 750f, and so on, but don't remember exactly.

Posted: Thu Mar 25, 2021 8:58 pm

So general fitment-wise the tanks are the same as far as frame mounting,side cover mounting etc ?
I can get whichever petcock it needs...

Posted: Thu Mar 25, 2021 9:27 pm

Oops. sorry about the link. I just happened to have saved it.

"https://1drv.ms/b/s!AkEtTeXKs8mDt2osfSj-PNjhi6XE"

Yes, the general fitment is the same. FWIW, the fuel line output on the '79 & '80 petcocks is 5.5 mm and you may have trouble connecting it to larger inlets on later carbs.

Posted: Thu Mar 25, 2021 9:32 pm

Thanks for the help guys- one more question- anyone have experience with petcocks from
Oldbikebarn ?

Posted: Fri Mar 26, 2021 9:51 pm

headless wrote:

There differences is petcock sizing. See: http://www.cb750c.com/Genesound/Petcocks_79-83_DOHC.html

rl750 wrote:

I can't access that link- are the petcocks not interchangeable?

It works again, it's not too pretty, but it's usable.