do you have a magnetic oil drain plug? could be interesting to see if you have abnormal debris on it
if not, drain the oil into a really clean container and drag a magnet in it.
try refilling it with th ebest synthetic you can get and see if it makes a difference...
have you dropped the bike on the left side? sometimes it can bend the shift shaft a bit and add friction.
want to assumes that clutch disengages properly.
take off all the plates and check that the inner hub rotates freely
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