SOHC.co.uk Forums > CB500/550
550F vs 550K tanks
Bryanj:
You remember petseal then Dave
florence:
the paint looks pretty good.
Grewth:
--- Quote from: florence on January 14, 2026, 09:41:28 AM ---if not concerned about originality, the 750 tank fits as well. I've got one on mine.
--- End quote ---
I've already got a 550 tank, but after reading stuff about the K model having a longer tank, I was expecting Sod's Law to apply as usual.
My tank has a fair amount of surface rust inside and out, but it ain't rotten or significantly damaged.
But still nice to know that the 750 tank fits, 'cos there's plenty of them around.
Oddjob:
I seem to recall the F tank being longer than the K. Fitted one on my 500 and the seat wouldn’t shut so had to fit the 550 seat as well before it would close ok. If you fit a K tank with the 550 seat you’ll end up with a gap between the two.
No news on that seat yet, he’s ringing me at the weekend though.
Grewth:
--- Quote from: Oddjob on January 15, 2026, 06:38:58 PM ---I seem to recall the F tank being longer than the K.
--- End quote ---
See reply #3
Actually CB550 folklore seems to suggest that the K tank is the longest, you're the first person I've heard from who thinks it's the F tank which is longest
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