Hey. Im Vince. I just got a stripped down 1990 Ninja EX500 and i know nothing about it or motorcycles in general. My dads a mechanic and hes helping me work on it. But im not 100% sure where to start. Any help would be appreciated. The gas tank, seat, and all other plastics are off. I took out the air box and intake. No gas lines are connected. It has a battery that i took out. The thing on the shaft on the lower left side of the bike (key way?) Is sheered and not on. I dont know where to go from here. Please help. Thank you. Any help is appreciated. - A 19 year old boy trying to get a ride