Master cylinders and Slave cylinders...

[badger]

So, after a ton of fannying about fuckery I just can't get my hel 19mm MC to move enough fluid. After playing about with other people's levers (calm down) with a stock set up which just work fine. 

I've read that bimotas sleeved down the slave cylinders to use brembo m/c's (can't find any sizes/ ratios) which is what I'm looking at doing so I can keep the matching hel set up and not have a creeping clutch. 

Has anyone done this? If so how did you do it? I've seen PTFE brake sealents which I'll probably use as its brake fluid resistant. 

[SiBag]

I would wip the slave cylinder off my SB6 and take some pictures. But it would require me dropping the engine out the frame.

[bluedog59]

4 minutes ago, SiBag said:

I would wip the slave cylinder off my SB6 and take some pictures. But it would require me dropping the engine out the frame.

The joys of Bimota ownership, I share your pain. 

[SiBag]

I found this on the Bimota forum, but no dimensions.

"The housing was bored out and a sleeve fitted to suit a smaller piston and seal."

With a bit more digging it looks like the new piston it 28.5mm dia.

 

Edited October 1, 2025 by SiBag

[bluedog59]

A lot of work just to use the wrong size M/cylinder. Must have got a job lot cheap when money was tight.

[badger]

1 hour ago, SiBag said:

I found this on the Bimota forum, but no dimensions.

"The housing was bored out and a sleeve fitted to suit a smaller piston and seal."

With a bit more digging it looks like the new piston it 28.5mm dia.

 

That's awesome! Thank you.

What a knob just to get that out!! The price of fancy bikes