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My ZD-21 spins over more than normal before it starts. Runs great once cranked and uses zero oil. Could it be the glow plugs?

I am 69 years old and never had a ztr before. Tractor with finish mower has been my life. Well, my neighbor just moved and sold me his ZD21 (cheap). I am a motorhead so I got it as a project for my work shop. I now love the damn thing. First thing is change all fluids, my rule. Engine oil done...