The sportster has better performance assuming it was a newer sporty. The difference is going to be like going from a stool to a couch. As long as it was not ridden a 1000 miles in 6 months and parked since it should be fine. The tires yeah change them they won't pop but they will wear quicky
2008 V-Star Silverado 1100. K&N filter, airbox mod passenger floor boards, all light visors, ISO grips, Cobra slash cut mufflers, Saddleman touring seat/ tourpack. Lots of little extras.