My clutch is slipping a bit, not sure of actual miles, but adjustments do not seem to be helping. It's fine taking off but while engaged, it slips if I roll-on quickly. I plan to adjust once again, but if no luck, a replacement. Any recomendations of brand or place of purchase, shall I swap clutch springs too? thx
As far as oil goes that is a factor for sure. Using incorrect oil with friction modifiers could cause the clutch to slip. It has to be compatible with wet MC clutch. SC Bob may chime in about the types of oil you do and don't want.
@Randall-in-Mpls, I was going to suggest EBC also but didn't know if that was the CX/GL clutch of choice or not.
If you buy from EBC make sure they are correct right away. I bought a set of plates for my GL1000 from their eBay store and they were the wrong size (diameter). They refused to admit that they could have made a mistake and I had to get eBay to mediate.
We used to commonly use automotive oils in bikes with no problems but some time in the early part of the century they started adding "friction modifiers" to automotive oils to help cars meet new environmental regulations and those friction modifiers can cause wet clutches to slip. The best advice since then is to make sure the oil you use is marked JASO-MA (Japan Automotive Standards Organization, Motorcycle, A = wet clutch).
I finally drained the oil last night, much darker than expected for only 300 miles. There was sludge (clutch material?) on the magnetic drain plug too. I honestly don't know what oil I had in the bike as I keep stock various kinds for my 10 vehicles (amazing wife!), but my guess is 10/40 automotive. This would account for the slipping clutch, and sludge. I'll correct this with proper oil.
As for the dark color, my guess is the complete engine rebuild had some break-in during the 300 miles.
If this is only 300 miles after overhaul I doubt the sludge is from detergent oil breaking it free. If the sludge is clutch material I would be worried about the same material plugging your oil pick up screen. With the money you have wrapped up in this motor I would play it safe and remove the front cover to clean and inspect.