Make sure the rear end is good, like the other post said check for fluid if possible or at least roll it around in neutral and listen for noise and make sure its not locked up. I passed on a few 250's that had shot rear ends on them, i assume from water getting in and everything rusting out, bearings going bad and locking up, etc. You will have a money pit if the rear end has issues.
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1984 Honda ATC200ES "Big Red"
1982 ATC200E "Hondie"
1988 TRX300FW "Project Quad" Still in progress....