03 Grizzly Problem

sup guys, i just bought a 2003 yamaha 660 grizzly
4 wheeler, runs great. My question is when on the road or setting still it got a little lean on it, well i mean it leans to the right like its got a low tire but they all have the same pressure in them. Any suggestions on what it might be,, im guessin maybe a bad shock or a week spring when not on the 4 wheeler it sets level any help would be great just need an idea on where to look