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Author Topic: '77 CB550F master cylinder size  (Read 424 times)

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Offline GardenGnome

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  • 1977 CB550F
'77 CB550F master cylinder size
« on: June 29, 2018, 01:33:09 PM »
Hi all,

I'm well on my way to getting my bike road ready before too long. I would like to know what size the stock MC is? So far I've read very conflicting arguments on this and have been given some info from the tech guys at Revival stating that it is a 10MM; however, I've read anything from 14mm to 12mm. Once and for all, what is the stock setup for this bike? Thank you.
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If I've learned anything about building a motorcycle, it's check and re-check your work before you put it all back together. Although you do gain more experience by doing it twice.

Offline calj737

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Re: '77 CB550F master cylinder size
« Reply #1 on: June 29, 2018, 01:52:45 PM »
I believe the 10mm is the banjo bolt diameter, and the MC bore is 14mm.
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"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline robvangulik

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Re: '77 CB550F master cylinder size
« Reply #2 on: June 29, 2018, 03:46:47 PM »
Correct, banjo is 10mm with 1,25 mm thread, master piston is 14mm.
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Offline GardenGnome

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Re: '77 CB550F master cylinder size
« Reply #3 on: June 30, 2018, 11:12:19 AM »
Awesome thanks for clarifying that. I’ve ordered the correct parts.
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If I've learned anything about building a motorcycle, it's check and re-check your work before you put it all back together. Although you do gain more experience by doing it twice.
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