roadrunner
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| posted on 13/4/10 at 03:34 PM |
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Bike clutch's
I am just in the process of investigating the clutch slip i had last year.
I have removed the springs which i purchased from the Bay and they have lost about 7mm in length compared to the ones i removed and they are easier to
compress.
My question is. How much material should be on a half decent clutch plate, i have .5mm left on both sides. Is this a worn clutch or is there life
still to had out of the plates.
Thanks
Brad.
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gixermark
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| posted on 13/4/10 at 03:37 PM |
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.5mm sounds fairly worn ?
I'de be throwing a set of new frictions & a set of barnett springs in - at least its done now for the season...
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handyandy
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| posted on 13/4/10 at 03:42 PM |
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.5mm is not alot left, like Gixer has said, put some new friction plates in with new fibre plates,springs & bolts if poss, may as well whilst its
all apart.
Also make sure the basket has no "notch,s / ridges" along the slide edges, a light filing cures them ( don,t go overboard with filing tho
)
cheers
andy
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roadrunner
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| posted on 13/4/10 at 03:43 PM |
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Thanks guys.
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mistergrumpy
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| posted on 13/4/10 at 04:29 PM |
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If it helps, from the Haynes manual
Steel Plate thicknesses should be: 2mm,2.3mm, 2.6mm
Friction plate thickness: 2.72mm to 2.88mm
Standard spring free length: 73.49mm
Service Limit: 69.9mm
Clutch plate assembly thickness:48.4mm - 49mm
(This is measured from the outer face of the splined centre basket that the steel plates go over to the inner face of the pressure plate)
Hope this helps
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roadrunner
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| posted on 13/4/10 at 04:36 PM |
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My friction plate thickness is 2.75, so they are just within the limits. Do you think they would last for this summer as money is not really free
flowing at the moment.
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mistergrumpy
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| posted on 13/4/10 at 04:44 PM |
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How do your springs measure up? I imagine that the plates would just about last and that there's a little tolerance built into that measurement.
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roadrunner
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| posted on 13/4/10 at 05:48 PM |
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The springs have had it.
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BenB
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| posted on 13/4/10 at 05:59 PM |
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Yup, it's often the springs that go soft (especially the ECB ones by all accounts).
If money is really tight can you not just wack some washers under the springs to nip them up a bit? I know springs are cheap but it's a PITA if
you have to wait for them to arrive in the post etc etc.
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roadrunner
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| posted on 13/4/10 at 07:53 PM |
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The springs i replaced might have been uprated ones, but to be on the safe side i renewed them. So the old ones are going back in.
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BobM
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| posted on 14/4/10 at 04:35 AM |
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Beware plates that seem within spec. I found out to my cost last year that plates can be knackered but still measure well within tolerance. Once
they've been slipping, even if it's cos the springs have been knackered you may need to replace the frictions.
My plates looked like new and were full thickness so when it was slipping I blamed the springs and even the oil. Ended up with a sump full of clutch
plates!
I'd recommend replacing the frictions and get some heavy duty springs.
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:{THC}:YosamiteSam
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| posted on 17/4/10 at 10:14 PM |
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yea i would agree.. My busa clutch was slipping last year.. When i stripped it down and measured the plates they were just on the wear limit.. And
discoloured too.. If its slipping the surface will glaze a bit.. Thats enough to cause slip.. While it was apart i checked the basket grooves the
clutch slides on and put some stiffer springs in as well.. Change the oil too.. You will have to drain that anyway..
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