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Clutch Slipping Tried Everything Recommended Here

babutler

babutler

Joined Jul 2008
207 Posts | 0+
So I can get to 90 without the clutch slipping but after that it's terrible. I've change the plates, I have new springs, I adjusted the pushrod back as far as it will go and I'm using Semi Synthetic oil.

Why the hell won't it stop slipping? It seems to do it more the bikes is warm. I took off my clutch lever and noticed the black rubber plunger has a hole where the pushrod goes in. Is this normal? Could that be the problem?
 
there a few things that can cause slippage.
did it just start or was it after you changed something?
aftermarket lever?
overfilled reservoir?
Oil Brand?
resting your fingers on the lever?


do you have freeplay at the lever?

did you replace the steels as well as the friction plates?
if not simply roughing up your steels with some course sand paper (ensure you clean them before refitting) can be enought to stop slippage.

i think the early mille's suffered with slippage and the clutch was modified in later models, i think this was something to do with the washers on the springs.
 
The reservoir is at a good level. Last i replace my clutch I did the steals as well. I'm about to try Motul oil. I don't know if I have my finger on the lever but there is free play in it. I have the plunger backed out as far as it will go. I do have a small hole in the master cylinder where the metal pushrod from my lever goes in. Is this bad or normal?
 
i know the rubber you mean its just a dust cover i dont think that will effect it unless dirt has got in and the plunger is not returning fully.

Motul
i used the 5100 and that was fine i tried the 300v and that caused v bad clutch drag when cold
 
Okay. Do I really need to get the new pressure plate for my clutch? I heard there is a revised one.
 
babutler said:
So I can get to 90 without the clutch slipping but after that it's terrible. I've change the plates, I have new springs, I adjusted the pushrod back as far as it will go and I'm using Semi Synthetic oil.

Why the hell won't it stop slipping? It seems to do it more the bikes is warm. I took off my clutch lever and noticed the black rubber plunger has a hole where the pushrod goes in. Is this normal? Could that be the problem?
Click to expand...

Had same problem with mine and tried all the same things, It was the clutch pump.
 
Last edited:
I soaked my clutch plates for less than 30mins and it's fine. Think it's an 'old wives tale' to be honest. Mine was dragging (by that I mean it was moving the bike even with the lever in) a bit when I first started it but after a bit of purposely slipping it (not excessive - as it said to do on the box of the plates) it's been perfect. Did a track day at Cadwell just a few days later and it wasn't slipping or dragging even slightly.
 
Soaking plates is a load of bollox griff put a set In mine put it back together I went and give it some and it was fine
 
soaking might make a difference initially but once they have been on the bike and its ben ridden they are going to be soaked in oil anyway.
i do smear oil on them when i fit them but have never soaked them.
 
babutler said:
What do you mean the clutch pump, slave cylinder, master cylinder?
Click to expand...

The pump which the clutch lever is attached to on the clip on. I'd call it a master cylinder but in the parts manual it's called a clutch pump. I had exactly same problem, slipping when revved hard. Changed oil twice, then plates, made no difference. Took it to aprilia dealer and it was the clutch pump. Job done. Try Taz motorcycles for a used one or wait 2 months for a new one from Aprilia like I did.

From what you have said, I can more or less guarantee its that. If you've got a mate with same bike, ask him to lend you his to swap em over to try to be sure.
 
I've been having a tiny bit of clutch slip for a while now but recently I changed levers and for the first few miles all was great and then suddenly I had huge slip, I couldn't even overtake cars in town, so I stopped and took the lever apart. I bought a hacksaw and cut about 3mm off of the plunger (which was screwed back as far as it would go) I then rounded it off a little by scraping it on the curb. After that all was well. Since then I have taken it apart again as it had been a bit rounded off on the screwdriver end and freed up the threads, I noticed that there is a teeny tiny grub screw in the barrel which I think most peopl miss (I did!) and this is why it's hard to turn the plunger!!
 
Hey hey!
I think the boys are right, it's very rare to to have a master cylinder fail but it's doest happen, dude please
Make sure that you have got free play in the clutch push rod, the hole in the rubber boot is for the clutch push rod to go through and connect with the master cylinder piston, it's easy for this to be trapped in between the push rod and the piston and cause the slip you speak of...... It's very difficult to the free play accurately!

If in doubt go loose!

Have you changed your levers recently?
 
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