Ride it a bit first (a few kilometers) to get the cobwebs off, then do as follows to check which wheel is being difficult ;
1. Put bike into Neutral with engine OFF,
2. Put the kickstand out (Down),
3. Standing on the left hand side of the bike, grab the rear right of the bike and pull up and towards you. This should lift the back wheel off the ground, balancing the bike on the sidestand.
4. You can then run the back wheel with your hand to see if it runs smoothly or if it is catching. (I usually just balance the bike against my legs and then lean over it to do this, although you may want somebody to help at first if you are not to confident)
NB, this is also a nice way of putting chain lube onto the bikes chain.

5. Once this is done, you can check the front wheel in a similar fashion. Stand on the the left of the bike and while the sidestand is down, pull back and towards you on the handlebars. This will lift the front wheel in the air while balancing the bike on the sidestand.
Good Luck, I hope it is all ok!

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