Chain Won't Adjust

Welcome Spyder.
How old is your bike? It’s quite common for the adjustment hub to seize up if it’s been neglected at a service schedule and has not been greased up.

 

Welcome Spyder. Yup like freck said, it could be seized up, or being on the side stand is making it a lot more difficult. My is on a rear stand and I find it to be a finicky job for sure. I would suggest trying it with the rear tire off the ground before any drastic measures are employed.

 

I assume you mean the pinch bolt right at the rear end of the swingarm which needs to be slackened for adjustment and then retightened. - If you're undoing nuts then you're doing it wrong.
+1 what freck says, the hub assembly should be stripped out of the swingarm and greased (I use copper grease) at least once every couple of years, unfortunately dealers rarely do this, and it's a bit pot luck as to whether it came out of the factory well greased. Greasing of the rear suspension linkage is another area that can often get neglected by the stealers.
If you've only just bought the bike from a dealer I would take it back to them to check whether it's seized or not.

 

Spyder
Welcome to the family. Yes if the bike is new to you let the dealer correct the adjustment. Do drop the inmates a picture of the as here in the asylum we like pictures.
Regards & Ride Safe
Joe.

 

Make sure you have a well fitting C spanner for the adjustment too.........and don’t be smacking it with anything!

 

If you suspect seizure then an overnight soak in penetrating oil followed by a sharp, vertical tap on the head (bolt, not yours) should free off any corrosion.

 

In situ, accepting it is tight up behind the sprocket.