The 12 only came with a 6 speed box. If a gear is missing then something is wrong with the gears or gear selector mechanism. Do you know which gear isn't there?
I'd start with the easiest area to access. Pull the clutch basket and you can access the gear change mechanism. If you get the rear wheel off the ground and spin it by hand, you can work your way through the gearbox. Have a look at the gearchange mechanism for a reason why you're missing a gear.
Out of curiousity, what happens in 5th, when you try to shift into 6th? Are you getting the full shift movement, or is it solid, ie no movement when you shift?
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