Here is a link to an interesting article discussing if there are any risks in purchasing a motorcycle that has been sitting on the showroom floor for several years. The bottom line is to check the tires for flat spots and the battery to be sure it is still in good condition, otherwise you should be OK: https://www.motorcycle.com/ask-mo-anythi...l-by-dates.html
Current motorcycle collection: 2002 Yamaha FZ1; 2005 Triumph Bonneville T-100; 2011 Royal Enfield Bullet 500; 2009 BMW F650GS; 2016 BMW R1200RS; 2018 Zero S 16.6 kWh