Ah, let's see ... I haven't done it on a 906, just my 750 but I believe their mostly similar? Somebody correct me if I'm wrong, but Beilby, you will know right off the bat if something in my description doesn't fly.
Now, if the 906's axle carry is just a slider in the swingarm, then nevermind, all this is rubbish, but it sounds like we're going to be looking at the same thing.
It's been a couple months, but as I recall, there are a couple bolts in the swing arm that hold the concentric in place. The concentric is the circular piece in which the rear axle sits. The rear axle is off-set from the center of the concetric, so that as you rotate the concentric, the rear wheel essentially moves around in a circle along the plane of the two wheels. Doing so can slightly later your rear end ride height along with (obviously) chain tension.
Anyway, loosening the concentric stay bolts should allow you to rotate the concentric in the swing arm. There is a socket large enough to accommodate the nut in the standard toolkit, but as I recall it was something like an 18mm or maybe larger? Suffice to say though, and I imagine especially if it's been a while, your best bet is to fashion some sort of lever to break free the concentric and rotate the whole unit. If it's been 8 years? :umm: ugh Just remember, bend at the knees, let your legs do the work. This isn't something you can do sitting down. Might want to have somebody hold onto the bike, too.
But once you've broken it free, it shouldn't be too difficult to rotate.
I seem to recall that there are two sizes of sockets you can use; the larger one is for turning the concentric, the slightly smaller one is for loosening the axle nut itself - not something you need to do if you're just going to adjust your chain or ride height. I'm thinking the concentric adjustment is on the left as you sit behind the bike looking forward, and the axle nut is on the right side. Caveat: I forget excatly - however the bike is out in the parking garage, so I will go check at lunchtime.
