My hydraulic clutch on my mk hayabusa uses a bike rear brake master cylinder as the master cylinder for the clutch. When operating the clutch pedal, the first half of the travel doesn't actually move the slave cylinder rod that moves the clutch, it acts more like a pre pressure build up in the system as you still get some resistance in the pedal feel and i can see the flexi line move slightly as the pressure builds. Then the second half of the pedal travel actually operates the clutch but it is a very small amount of travel in order to do this. (I hope that explanation makes sense to someone)!

So my question is, is it normal for the clutch to operate like this or is there an underlying problem??? Would moving the pivot point on the pedal for the mc help with getting a more direct and longer feel to the pedal??

Any help appreciated.

Doesn't sound right.
A hydraulic clutch should move from the start of the pedal push.
Is the clutch push rod in the gearbox long enough - especially if a different clutch slave bracket has been made to avoid a propshaft adaptor flange?

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A hydraulic clutch should move from the start of the pedal push.

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Sounds like it has air in the system, the initial push is compressing the air against the resistance of the clutch before it starts moving.

^^ +1

^^ +2

Fair comments guys, that had crossed my mind as well. I have spent hours bleeding the thing. Anyone got some good methods for bleeding the clutch up or any good bits of kit to use that actually work! I think it would help if the mc had a bleed nipple on it!

Have you considered a bleed nipple ? Cannot find a picture but my clutch slave banjo has a nipple added to it.


Found it



[Edited on 23/5/13 by T66]

My sc has a bleed nipple on it already, i'm wondering if there is air trapped in the mc. The mc doesn't have a bleed nipple. Looks like i'm going to have to try bleeding the system again.