SOHC.co.uk Forums > CB500/550

550F vs 550K tanks

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Grewth:
Could some kind person,  with a CB550F, please manage to run a tape measure along the tank, and post up the overall length please  ?
No rush, my 550 is a "back burner " project.
I'm asking because I've got what I thought was a half decent 550F tank, but I've read here and there,  that the K model tank looks very similar,  but is actually longer.
I guess that this refers to the later K model tank with the flush filler flap.
I've tried looking at various photos of the F and the late K models,  and TBH, I can't seem to see anything in it.
Obviously,  if I've got the wrong tank (there's no paint on it to give any clues), I'd really like to find out before I put any work into it

mickwinf:
pretty sure all the flush cap type ie F1 F2 and k3 are same just paint difference. earlier 500/550 are a different length but all will fit any 500 or 550 frame as long as you use the matcing seat.

Grewth:
Thanks for that.
After looking at loads of photos,  comparing the orientation of the rear of the tank to the vertical frame tubes, I've concluded they're the same length.
However,  the K3 side panels wrap around the air cleaner plenum chamber,  while the F panels don't.
This makes it look like the K3 tank is actually longer.

3scs:
K3 and f2 tanks

Oddjob:
Mick is correct. The F and K3 tanks are the same, the 550K1/2 however are the same as the 500K, shorter. Match with the correct seat and like Mick says, they will fit the frame.

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