who wanted a lighter clutch?

[Kryten]

I had seen these as well, and thought for what the cost is it wold have been worth investigating.

Venhill do an expensive Magura Kit but the stroke is max 10mm and I think I measured my SZ as needing 15mm+..

http://www.venhill.co.uk/Downloads/HymecSelection.pdf

There is a rather good looking GSX11 race bike for sale on the German bay at the moment that the builder has solved the problem by using a normal slave cylinder fixed to the rear engine mounts and that pushes the clutch arm forward.

See pictures 1 & 3

http://www.ebay.co.uk/itm/Suzuki-GSX110 ... Sw2xRYPvJg

You could always buy that and rob the bits off it...........

[fossie]

]Clearly I'm uneducated here but, if the actuator is just in the cable, the actuation movement will be slightly sideways as well, so will damage the seal by the pushrod.

How can the hydraulic actuator pull the cable? The fluid will travel down the line behind the rod and push it out until the pressure at the lever is released.

[johnr]

the cable isnt in the fluid, i think there is a plunger that is pushed by the fluid, the connection to the clutch arm is linked to that plunger. there is no cable. the bit that pull the clutch arm appears to be a threaded rod.

[fossie]

I realise there is no cable, I phrased it incorrectly, I meant the actuator sits where the cable was up against the locator for the cable so will be free moving sideways.

Will have to see stil can't see how it is capable or pulling action . Huuuuuum.

[Kryten]

It is a reverse acting piston/cylinder. The hydraulic pressure acts on the what you would consider to be the underside of the piston. So there will be a set of pressure seals around the connecting rod to the clutch actuator arm as well as the piston.

Pulling the clutch lever pushes the piston into the slave cylinder, giving the pull rather than push.

Biggest problem will be if there is enough stroke or travel to operate a GS/GSX clutch pack to avoid drag when hot.

The expensive, but well engineered Magura kit, only gives 10mm of piston stroke. As far as lateral movement goes, there is probably enough flex in the connecting rod to the actuating arm and the clevis pin.

This is worthy of a article in the "Pride" if someone gives it a go.

The German Race bike goes for a different approach.

By using a conventional forward acting slave cylinder mounted off the rear engine/frame plates. The clutch actuating arm has been moved around on the splines by about 90 degrees (clockwise looking down onto it) and the piston is fixed to the arm so it pushes the arm to operate the clutch; simple and effective, but not as neat looking as the reverse acting cylinder.

In both cases the return action is caused by the springs in the clutch pack, as for cable operation.

[johnr]

these turned up today, they actually seem like theyre rather well made pieces of kit.

[fossie]

so should be operational by ....say new year..........which , unsure of but you gotta 'ave a plan.

[johnr]

ha ha ha.....

[sparki]

Must be done by now eh...