Clutch issues

Th3Judderman · Feb 10, 2011

Right I've worked out that my clutch issues are somehow related to the vaccum slipper. When it's on full chat the lever goes limp till about half way in as though something else is actuating the clutch. This is the only time I experience clutch slip any other time the clutch will bite hard and it'll drag it's self along!

My question is, what parts are related to the vaccum slipper and could be causing my issues?

Thanks in advance, Andy

jwer23 · Feb 19, 2011

Try just whipping off the hose that comes from the throttle bodies to the clutch housing, and blank off the pipe, not the clutch housing hole... Worked for me, you should be able to tell if it's the one way valve at fault If clutch feel is ok and doesnt slip

Spoonz · Feb 20, 2011

Could be but not sure it's the valve. The diaphram is vacuum operated and vac is at it's highest on a closed throttle so if anything it should slip more decelerarating not WOT which has almost no vac.

Not got an evo clutch slave fitted have you ?

Th3Judderman · Feb 22, 2011

I don't think I've ever seen one so I'm not sure, if you can give me details of what I'm looking for and where I'll check

Spoonz · Feb 22, 2011

It's on the left side just next to the front sprocket. If it's an evo it will look something like this but maybe not the same colour.

Th3Judderman · Feb 23, 2011

No definately not got one of them bolted to it. What advantage to they offer?

Spoonz · Feb 23, 2011

Th3Judderman said:
No definately not got one of them bolted to it. What advantage to they offer?

They give a lighter clutch pull but the Evo version had an issue with clutch pushrod chatter pushing the piston back at high revs. That gave a limp lever hence why i thought you might have had one.

sc_obvious · Feb 23, 2011

Hope I am not being a mong (been boozing all afternoon) but they make the clutch significantly lighter!

Th3Judderman · Feb 23, 2011

any idea what caused the issue with the evo? I'm wondering if the same thing could have happened to my stock clutch?

Spoonz · Feb 23, 2011

The pull on the Evo slave is about 30% lighter than oem. I would buy MPL or Oberon versions though as they are more widely available and you wil get new seals etc easier as they are both euro made.

Not aware of the chatter issue causing problems with other slaves but anything is possible. On the Evo it only generally happened on higher mileage bikes that had a bit of clutch wear. That made the pushrod chatter more than a low mileage bike and the Evo slave was much less tolerant of this than the other makes.

Th3Judderman · Feb 23, 2011

What was the fix for em? Just wondering what I check on. :thumbup

Spoonz · Feb 24, 2011

Th3Judderman said:
What was the fix for em? Just wondering what I check on. :thumbup

The fix was to either not use an evo slave or reduce the worn parts causing the excess chatter on the pushrod.

I would exhaust every other avenue before going down that route though.

Leepants · Apr 12, 2011

Bloody hell! MPL is 149 euros!!! Oberon one is £90.

My new one may have to wait until the end of the month.... :s

Clutch issues

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