You may need to clean the carb if it had enough time for the gas to go bad (ethanol) If its humid out when the bike sat for two months it could have absorbed moisture and this can cause a green corrosion in the carb . If you know your bikes going to site for a long period of time and you have fuel with a 15% ethanol blend its a good idea to use a fuel stabilizer. You may be able to get away with a can of carb cleaner and giving it a good spray in all the jets . You should also check the spark . Is it a clean strong spark Blueish or week and yellowish You may need a new coil or coil packs depending on whats on your bike. Hope this helps