I have not tried this myself, but assuming you have a new gasket, I would try a non-setting sealant first such as blue hylomar or ezturn. The former may be easier to find as permatex has started branding it in the US.
the right hand crank cover, sprocket cover and clutch cover... ive been tightening to the torque settings in the haynes manual but there is still a little leak , mostly on the bottom of the covers but i believe that might have something to do with gravity.. tried hylomar and rtv sealant and they were both hit or miss
put some fine grade sandpaper on a peice of glass, and rub the mating surfaces of your covers in circular motions on the sandpaper.this will remove any small defects that might be preventing it sealing.
also replace the oil seal on the sprocket cover
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