SOHC.co.uk Forums > CB750
Clutch plates
Pauarc:
Just a thought could it be the oil any suggestions on that
K2-K6:
--- Quote from: Pauarc on June 29, 2023, 12:38:55 PM ---Just a thought could it be the oil any suggestions on that
--- End quote ---
Difficult to answer, and of course there are many opinions too ;D
The oil is, in an ideal world, trying to cling to components, but the clutch is designed to get it out of the way. As the clutch closes it's designed to squeegee the oil out from the friction area via the various slots in the fibre plates and with centrifugal dispersion to evacuate the oil and take torque drive through it.
When you open it with lever the oil will obviously go back in again, if oil is cold then the viscosity will increase the drag on the plates, one to another. Worth checking if there's a difference stone cold in comparison to up to temp/hot running.
If different, you could attribute that to viscosity change, but not much you can do about it. It would give you a reason partly though. A thinner oil could be used potentially, they are designed to run 30 viscosity hot from their tolerancing, in purest design terms. When contemporary though, my experience was to run them on 20/50 as using it pretty hard, also big que into race meetings they'd get very hot. That's allowable in Honda specs too, but didn't give any memorable problems in regard to clutch operation.
The method I've given above should give the absolute maximum lift attainable within the components used. It'll be a worthwhile benchmark to at least see what you think of it then.
Interesting to hear if that method gives you anything in the way of measurable improvements.
Trigger:
Do you have a double steel plate in the stack ?
Pauarc:
I have no double steel plate what would this do
Trigger:
It was an upgrade that was fitted to all K6's. Maybe you don't have a K6 clutch and it is from another 750 ?
Is your clutch fitted with the correct springs ? Two types of springs used on the 750K ;)
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