Clutch slip

[brodsord]

Hi everyone,
So I’ve got the old girl out for a quick road test.
F2 frame k5 engine.
All is good but Clutch is slipping after second gear.
Last time she was on the road was 1998.
Fresh oil in her etc and I’ve adjusted the clutch as per manual, do i need to replace clutch or is there something else I can do ?
Many thanks,
Gray


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[Trigger]

The manual is incorrect on the settings. Plates go hard and brittle after years 

[brodsord]

Thanks G.
Should I replace them then?


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[Trigger]

My Honda crystal ball needs upgrading at the moment so, I can't see your clutch plates. Try setting the clutch in reverse of what the manual states 

[brodsord]

Ok thanks G I’ll have fiddle tomorrow.


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[Lobo]

...there’s been past threads commenting on how modern synthetic oils can promote clutch slip (dependant upon the additives); are you using good old cheap mineral oil? (tho’ if it’s slipping in 3rd perhaps the issue is indeed more significant than oil...)
Anyways, Google it... the jury seems to be out on this one...

[brodsord]

Thanks Lobo,
Yes mineral oil is what’s in there.
Ill have a google this morning


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[brodsord]

Hi All,
I’ve taken the clutch out the friction plates all measure around 2.40 to 2.70 ish mm
Back friction plate in the picture below looks
Mullered.
The pressure plate also has been broken, it had been epoxy resined which was holding, am I ok to weld the broken tab back on or should it i get a new one?
Also do I have to remove the inner clutch basket to fit new clutch plates or can just assemble them into the basket in situ on the bike?
Thanks for any help





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[Nurse Julie]

Definitely get a new / replacement clutch lifter plate. Those corners snap off for fun at the best of times. If you can't find a new one to buy, we have loads of good used ones here.

[philward]

Mike Smith at 'good-stuff' (he is a dormant forum member I think) does this upgraded plate he uses for his racer - https://good-bits.co.uk/product/cb750-sohc-clutch-actuating-hub/

[Bryanj]

With a fibre worn that bad i would suggest a full set of fibre and steel.
That plate gets wrecked when the centre outer plate is put on wrong, it only fits in certain places

[Trigger]

New plates all round.
I would also fit a replacement lifter plate, new lifter bearing  and do you have a double plate in the stack ?
Look for grooves in the surface of the plate, clutch and the center, clutch 

[brodsord]

Thanks all for your reply’s.
Hi Trigger yes it has the double plate in the middle.
I’ve just sent Andy at good bits a message to see if he is still doing internet orders, he has an updated lifter in his web shop and a complete clutch kit.
Is the double metal plate specific to different models?
Thanks
Gray


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[brodsord]

There’s no grooves I meant to add, the plates are smooth, they seem to have a diamond pattern etched in the surface


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[brodsord]

Mike Smith at 'good-stuff' (he is a dormant forum member I think) does this upgraded plate he uses for his racer - https://good-bits.co.uk/product/cb750-sohc-clutch-actuating-hub/

Thanks Phil, I’ve spoke with Andy at good bits a few months back, very helpful fella, I forgot about his shop so thanks for heads up


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