Hydraulic Clutch Conversion for 750's & 860 RH selector box engines...
I have been wanting to do this for a while, the Laverda bars make the best routing for the clutch cable above the rev counter and continual use of the clutch is slowly marking the chrome rev counter bezel.
I know that is a pretty sad reason to rip out the entire manual clutch mechanism and introduce hydraulic complexity, possible failure and fluid overheating but Hey! it's my bike.
I researched a number of hydraulic clutch conversions, Steve @ BevelHeaven bought up
this design which is now
on his site here which is really neat and if I ever win the lottery or am taxed less I might buy for the SS - it doesn't fit 750/860 LH selector box machines.
There are other
home grown attempts on the net and
more power to their elbow.
As part of my research I bought a monster master cylinder & ST2 slave cylinder which I won't be using. I would have liked to have used as many Ducati parts as I could, but for this one my answer lay elsewhere.
Who would expect Venhill cables would host both an appropriate
master cylinder and
slave cylinder with the correct 10mm thread to screw straight in to the existing crankcase clutch cable mount point? Not me, but I have bought both.
The slave cylinder does not contain a return spring; I wanted the hydraulic clutch to be self adjusting but didn't want the spring to be so strong as to ride the clutch - they are not renowned for their strength in any case.
So I sourced an
appropriate spring but I can't remember which one :embarassed:. If anyone is really interested in this arcane thread, I'll dig it up (I hope :dunno

.
I bought the slave cylinder first and you are about to see many sad signs of Paul hackery but again, it's mine!
I bought a hacked late Bosch LH gearchange sprocket cover from Paddy which apart from being drilled and (badly) fitted with a Japanese slave cylinder, usefully came with appropriate stainless steel pipe & fittings. I would like to add that Paddy had had nothing to do with the cover hackery

.
So here is the kit, minus the banjo bolt because I forgot the Frando Master Cylinder uses 10mmx1.25mm as opposed to Ducati 10mmx1mm thread.
and here is the correct banjo bold...
I noticed that the clutch arm is not in line with the cable in the standard set up and thought that the slave cylinder would be put under stress unless it was pulled directly in line with the piston. So I bought one of
these extended clutch arms. This clutch arm is too long and needs cutting down, also the cable pull angle needs to be adjusted at the same time. I commissioned
P & D Bikes to alter the clutch arm to be exactly the right height and angle to match with the slave cylinder. I gave them a set of spare crankcases with all the parts attached, they listened, understood and did a perfect job; 10/10. They also had to extend the arm on the slave cylinder as you can see from the original picture below, it's 'a bit longer' now. Before...
and after extension...
With that work out of the way, it was time to start fitting the bits. here is the extended clutch arm fitted to the selector box...
The modified end of the clutch arm...
Selector box refitted...
The master cylinder fitted...
The hydraulic cable exit from the master cylinder (Yup, that really is dirt - bad me)...
I intend to cover the stainless steel hose with heatshrink and make it look like clutch cable but have run out (hey ho), but without the hose/cable it will look something like this...
or this...
With preparation, it has gone together smoothly although I am pigged off I didn't order in the correct sleeving/heatshrink, I would have had it finished today.
Next installment when the sleeving arrives and I have time to bleed it...