Author Topic: Clutch slip  (Read 486 times)

Offline brodsord

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Clutch slip
« on: April 19, 2020, 08:10:55 PM »
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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Offline Trigger

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Re: Clutch slip
« Reply #1 on: April 19, 2020, 08:20:24 PM »
The manual is incorrect on the settings. Plates go hard and brittle after years  ;)

Offline brodsord

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Re: Clutch slip
« Reply #2 on: April 19, 2020, 08:21:31 PM »
Thanks G.
Should I replace them then?


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Offline Trigger

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Re: Clutch slip
« Reply #3 on: April 19, 2020, 08:30:20 PM »
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  ;)

Offline brodsord

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Re: Clutch slip
« Reply #4 on: April 19, 2020, 08:37:13 PM »
Ok thanks G I’ll have fiddle tomorrow.


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Offline Lobo

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Re: Clutch slip
« Reply #5 on: April 19, 2020, 11:08:49 PM »
...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...
« Last Edit: April 19, 2020, 11:19:58 PM by Lobo »

Offline brodsord

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Re: Clutch slip
« Reply #6 on: April 20, 2020, 09:02:25 AM »
Thanks Lobo,
Yes mineral oil is what’s in there.
Ill have a google this morning


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Offline brodsord

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Re: Clutch slip
« Reply #7 on: April 28, 2020, 05:58:21 PM »
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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Offline Nurse Julie

  • 1973 CB750 UK K2.1977 CB550/4 Mongrel Brat. 1978 CB400/4.
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Re: Clutch slip
« Reply #8 on: April 28, 2020, 06:31:50 PM »
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.
Im a Nurse, trust me, this won't hurt.....much !!!

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http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

Offline philward

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Re: Clutch slip
« Reply #9 on: April 28, 2020, 06:42:49 PM »
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/
Current Bikes:-
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Offline Bryanj

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Re: Clutch slip
« Reply #10 on: April 28, 2020, 06:46:32 PM »
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

Offline Trigger

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Re: Clutch slip
« Reply #11 on: April 28, 2020, 07:37:41 PM »
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  ;)

Offline brodsord

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Re: Clutch slip
« Reply #12 on: April 28, 2020, 07:59:55 PM »
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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Offline brodsord

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Re: Clutch slip
« Reply #13 on: April 28, 2020, 08:01:47 PM »
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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Offline brodsord

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Re: Clutch slip
« Reply #14 on: April 28, 2020, 08:04:03 PM »
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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