Quad gears **help**? mechanical help needed?

hey ive had my 250 cc quad around 1 month and i let my little bro ride its and he wasn't to goo with the gears and when he came back with the quad the leaver to change up and down gear was very slack, and to change gear not i have to get the leaver in a 90 degree angle





any ideas what wrong and how much it will cost ?

and what parts i would need ?



many thanks please help me :)Quad gears **help**? mechanical help needed?
inside the transmission case the teeth that are attached to the shifting peg may have just popped off or the cable came loose