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tuned engine, molycote and clutch slipping

petrolhead

petrolhead

Forum Apprentice
I rebuild my engine and tuned it with BB ?69 Wiseco?s and 29mm. smoothbores.
Now I?m having a slipping clutch.
It starts to slip in the higher rev?s. about 6K
I have already changed the oil, the clutch springs (oem) and measured the plates; they are in spec.
I also cleaned the plates and scuffed them with scotch brite.
I maybe worried that there is oil contamination because i have used molykote on the cam journals and on a few other places.
The molycote was recommanded in a workshop manual so should i doubt this ?

Or could it be that plates are loosing grip because of age ? Tires age...
Anyone has bad experience with molycote in the engine ?
Or clutch slippage with a big bore ?
 
Last edited:
It is likely just age. I replaced a slipping clutch that measured up fine and had plenty of life left in it, but I fitted new EBC plates and three stock springs with three heavier springs, and it's perfect now. That clutch had done around 80 thousand miles and was 35 years old.
The extra torque from your big bore (although you don't say how much or what bike) is likely enough to give it the final nudge over the edge.
 
Also, I'd install a new clutch cable. Even if it still looks good, I'd get a new one, or at least oil the heck out of the one you have.

There are not many things in life that is better than a new clutch cable! 🌞
 
Thanks for the posts !
Yes the molykote i used is a grease; Mo2, it is used for bearing sufaces looks like it contains grafite, stains the same way...
I will go for new plates; just have to dicide wich make.
The oem disks are expensive.
 
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