SOHC.co.uk Forums > CB350/400
400-4 Clutch slip when cold
Erwin83:
Hi fellows,
looking for some advice. My 400-4 has a lot of clutch slip when the engine and oil are cold.
When warmed up, everything is fine.
I'm running Bel Rays 10w40 mineral oil, and the clutch isnt worn out.
In what direction should I be looking for a solution?
The fact that the slip disappears when all is warm, is just opposite of what I would expect...
Nurse Julie:
I had the same problem with a 400/4 I owned many years ago. Even though the clutch plates measured within spec, after fitting new plates, the problem went away. Trig also had it on a CD250u last year, once again all measurements within spec but fitted new and problem resolved.
K2-K6:
The oil is thinner when warm so it disperses from the clutch plates more easily when hot.
The 10w and the 40 viscosity specs are two different scales so it looks confusing.
Erwin83:
thanks for the responses!
I changed so many parts on the bike last year that I forgot, but the friction set is a new one, by Gecko. I also changed the clutch springs.
The 10w40 mineral oil is the right spec, so i'm now thinking about adding another steel plate (basket-steel-steel-friction-steel-fric..etc).
If I remember correctly, this is also how I took this 400 clutch apart, although I'd still like to understand why a clutch, with everything in spec, can still slip.
K2-K6:
Would adding another steel plate just increase the preloaded pack size?
Have you any way of checking spring length/rate? As all other thing's being equal, then spring loading will control the clamping pressure.
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