I have never seen one with a 6th gear problem, I would whip the sump off and have a good look in there. But then it may well be a selector problem, but it could well be something as simple as a broken peg on the end of the selector drum under the clutch basket.
I would happily take a look if you don't feel confident
I would happily take a look if you don't feel confident
Owner of Motorcycle Republic, Specialist in unfucking things that others have fucked up.