I bought a 2005 Ninja 250 last week. The previous owner, a work colleague, rarely rode the bike (odometer=140 miles) since she preferred her Ruckas.The bike had been sitting for the last year. Tige at Cyclemart.net checked the bike over, replaced the battery and rebuilt the carbs. If you don't want to do the work yourself, I think it will cost approximately $350-400 to have the bike serviced. Otherwise you could go buy the parts, check the Ninja 250 forums for instructions and do the work yourself for a fraction of that cost. If you did not stabilize the gas in the tank, I think you'll need to flush the old gas out of the system. Don't forget to examine the tires, brakelines, lights, hoses, etc.