SOHC.co.uk Forums > CB750

Dragging clutch

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Nurse Julie:
I'm sure you have as you have been very thorough but have you got the clutch centre and the plate clutch lined up, ie, set in the correct position?

Photo 1, incorrect position. Photo 2 correct position (sorry, crap photo) . It needs to be in exactly the right position.

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K2-K6:
Assuming that it checks out when you dismantle,  then try adjusting it as follows;- bring the adjustment screw in to touch and just make the smallest extra turn in the same direction (don't back it out) and assess it set like that.

This would be the most distance that the lift mech is capable of producing in giving space for the clutch plates to separate and would verify if that ability is there at all.

These clutch are unusual in that if the clutch pack heats up the thrust bearing moves away from the operating mech, with the likelihood of it slipping pretty remote.  But set like this will at least give an assessment as to if it's possible to get it to release the drive sufficiently.

Making the assumption that the handle bar clutch lever is a standard fitment?

Bryanj:
Firther to my previous there is a splined waser that goes on the shaft before the pack of centre and plates, if that is missing, or in the wrong place the pack binds on the shaft

Scottvincent:
Thank you for all responses. I believe that the plates are correctly located in the basket as they fit well down into the clutch basket. I will check again when I dismantle the clutch (too dark and cold at the moment!)
I have cross referenced the parts with an F1 parts book, all parts present and correct but, again I will check after dismantling.
If I give the adjustment screw an extra half turn clockwise, it slightly improves the situation but the bike is still not rideable.

I’m certain that I am missing something but cannot, for the life of me, think what it can be! I can see the bike being consigned back to the shed!

Trigger:
Do you have a double steel plate in the stack ? And does the last plate in have slanted groves ? It would be helpful to see pictures of the assembly  ;)

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