You stated been 'sitting' for many years probally with dried stuck rings, dry wheelbearing, crusty chain etc. do not run the engine under any circumstances until you complete a maintenance schedule. Remove carb and drip some Mystery oil on the rings and work the piston to and from with the flywheel. Pull the head and inspect the cylinder walls, oil liberally with 2 cycle or Mystery oil. btw how many miles on the odo? There are a lot of issues with a long time 'sitter' you MUST look at before you should attempt a ride.