Slave clutch rebuilt, leaking

[bjomag]

Hi guys, I just rebuilt my slave clutch with new rubber and spring, bleed it and the clutch is working fine but leaking! Any ideas? Pistol worn out? Please help...
//Björn

[balky1]

You need to replace the whole slave, unfortunately. Some repairs have been done by other members. If you have tools available and knowledge, it is possible. It is probably not the piston since it is steel. More likely the aluminum bore is worn out or pitted/corroded.

[X-Ray]

I did my clutch slave a couple of times by rubbing inside the housing with some 1200 grit sandpaper and brake fluid, each time it only lasted about 1 year before leaking again. This time bought a whole new slave, threw the old one in the bin and haven't looked back

[ribbert]

Hi guys, I just rebuilt my slave clutch with new rubber and spring, bleed it and the clutch is working fine but leaking! Any ideas? Pistol worn out? Please help...
//Björn

There are only two components that seal the slave cylinder (and stop it leaking), the seal and the bore of the cylinder. If the seal is new (and fitted properly) it can only be the bore. I don't know how you went about cleaning it up but if it is damaged/worn to the point of leaking with a new seal, throw it away. They are not very expensive and and a new one will outlast you and the bike.

I assume you have established it's not the bleeder or hose leaking.

IMO

Noel

[Bezmozek]

I did my clutch slave a couple of times by rubbing inside the housing with some 1200 grit sandpaper and brake fluid...

I did the same 3yrs ago and no problem since then, but it depends how big scratch/damage in cylinder is, and if this was done before, I think this repair can work once, maybe twice, if this does not help, only solution is new cylinder.
That is why brake fluid should be changed every two years 

[Pat Conlon]

Yep, as everyone mentioned, it's not the new seal, it's the soft aluminum bore.

If not pitted too bad, a quick in and out 3 times with a slave hone on your cordless drill will give you a uniform smooth bore surface.


Don't get too carried away with this tool, it's easy to remove too much aluminum.
I do not recommend polishing by hand, but that's just me....

[FJmonkey]

I do not recommend polishing by hand, but that's just me....

It seems that Pat's account has been hacked...

[Pat Conlon]

 

That did not come out well.... I do not recommend sanding the bore by hand....

[ribbert]

I do not recommend polishing by hand, but that's just me....

That should be for everyone!  Hone it or chuck it.

Noel

[Sparky84]

I do not recommend polishing by hand, but that's just me....

It seems that Pat's account has been hacked...jacked

[bjomag]

Ok, thx guy´s! I will look for a new slave cyl on ebay!

[FJmonkey]

Check the prices at RPM (see banner above). Randy is a Yamaha dealer so he gets quality parts and sells them at a decent price.

[Yamahahammer1300]

I just had this issue.  A quick call to RPM solved the problem