Thanks for the thoughts George. I checked the sprocket alignment & the clutch sprocket is about 1/8 inch outboard of the engine one.
This clutch has recently been fitted to a different gearbox & I stupidly didn't check the alignment when I put it together.
But I don't understand. This was a NOS clutch only recently fitted to the previous box & within pretty fine manufacturing tolerances these parts should all fit properly?
I'll check the engine cush drive assembly as well.
Is it milky or frothy ?
Lots of oils will froth up then condense back down as they cool
Do you have a cork or felt ring behind the clutch sliding plate ?
The cork will not hold much in the way of water but the felt will
Trevor, the oil's a milky yellowish consistency with no frothing. I made some on the bench by stirring together oil & water.
I didn't know there were cork rings available for behind the clutch, or did you make your own? Do you reckon cork would be a better sealant?
Well that will be the source of the water which is getting into the oil.
It does not take much to make the oil milky
Get a nice big bottle of the cheapest oil you can find then go for a nice long ride & change the 90ml of oil when you get home .
Repeat as often as necessary till the oil comes out clean, horrid thing to have to do on a nice sunny weekend .
Better still would be a new felt oiled with light machine oil before installed to prevent it adsorbing water
Apparently fabric treatments like ScotchGuard or even a water repellant like WD40 does a good job of keeping the water out of the felt.
Thanks for these ideas Trevor. It isn't all together yet, I can get some WD40 up there behind the clutch. Might even take the clutch off (again)to get a better shot. Wifey currently ransacking the laundry cupboard for Scotchguardy stuff.
It's meant to rain for a while here (about bloody time even if it does cut down the riding) so I've got the opportunity to do it all.