Learning on a Rebel. Love it and can´t imagine getting anything bigger, but I´m told that eventually I will want to move up. Have my Harley Sportster waiting for me...hope I can try it out at the end of next summer. Question: does it hurt to let a motorcycle sit for a year and a half? Are there tire degradation issues...or engine issues? Should I start it up every now and then or doesn´t it matter? It is currently hooked up to a battery charger for the winter.