2014 ktm 150sx won't start

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2014 ktm 150sx won't start
Bike type: 

My little brother started up my ktm 150sx and revved the crap out of it from cold until it just cut out now the kick starter does go down but a lot harder than normal and will not fire, prior to this happening the bike was making a rattly sound almost like something was loose, does anyone know what may have happened and what I need to do to fix it? Thanks