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400-4 Clutch slip when cold

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Erwin83:

--- Quote from: K2-K6 on March 15, 2018, 08:42:18 PM ---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.

--- End quote ---

Yes, it's a fairly safe way of increasing preload. Another method is adding rings under the springs. I added rings on my Aprilia Falco after having modded the clutch basket to counter slip...

I installed a new Gecko clutch last spring, with new Gecko clutch springs as well...

I'm a bit lost why I would need more preload, other than I could imagine the steel plates being worn a little... Or maybe something wrong in the clutch lever mechanism integrated in the right cover?

ka-ja:
Hi,
    Try searching out a set of "race" clutch springs, the standard clutch will handle a yoshi 460cc with road/ track cam fitted, or question the   new friction plate qualities.

Erwin83:

--- Quote from: ka-ja on March 16, 2018, 09:39:26 AM ---Hi,
    Try searching out a set of "race" clutch springs, the standard clutch will handle a yoshi 460cc with road/ track cam fitted, or question the   new friction plate qualities.

--- End quote ---

Hi. I fitted the "heavy duty" version of Gecko springs and (by feel) checked the compression force on the new springs versus the old. It really seemed quite OK.

So assuming this is all in order, is there another possible thing I'm missing?

ka-ja:
Recheck position of clutch plates, especially rear clutch disc spring/disc spring seat is in the right position and the thin friction plate is in its right place.

TrickyMicky:
Have you tried the very basic approach first? As the engine warms up, the free play in the clutch cable increases, and some people have been known to set the lever with minimal play when the engine is hot, meaning that when it cools you have no play in the cable whatsoever. Set the free play with a cold engine, try this first, much easier than pulling a clutch apart! Be Lucky!

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