manual says to use sae 10w-40, but this is making my clutch slip and hard to adjust for freeplay, basket is alright, new plates and cable, what oil are you using and having good results with??
I ran nothing but Bel-Ray 80w Gear Saver in my CR125 and had ZERO clutch problems in the year I had it. I gave it oil changes about every 2-3 rides (10hrs). Engine took 850ml but I gave it the whole quart.