CB550 refurb

[Johnny4428]

I fitted this DS master cylinder kit a little more than a year ago. But it has failed big time. Not just a weep but a pool on the floor in the morning. Not even riding the bike! I would say the rubber is a touch hard and don’t like the fact that you can insert the plunger with little or no resistance. Bore in the cylinder looks fairly descent, so the question is where can I get a reliable kit from?



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[Bryanj]

Buy the ropo master cylinder instead

[Bryanj]

If its laid out as it was assembled it was done wrong, the loose lip seal shoul be aginst the piston and the hard cup at the very end

[Johnny4428]

It was assembled the correct way Bryan, doubt if would have worked the way it’s laid out there, it was just a pic of the removed parts. I ran the bike last summer with no issues and not a drop of fluid leaking, because I had renewed the seals and internals in the cylinder. The master cylinder looks to be in good condition for age, had it been otherwise I would have replaced it.

[Johnny4428]

Master cylinder assembly complete, cheaper than an OEM master cylinder kit!😳 maybe a no brainer.

[Seabeowner]

I looked out CB500T kits.
They tend to be cheaper. Paid a few quid less than this.
https://www.ebay.co.uk/itm/226295003217

[Johnny4428]

Thanks for the link there, I’m going to take another look at the cylinder bore before I order.

[Johnny4428]

After measuring the bore in the master cylinder which was well within spec, I ordered another repair kit. Picture shows bit of difference in the piston seal diameter.



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