Me and my buddy were recently trying to push start an old Raptor 80. After pushing it the engine seemed to turn over only stalling when the quad came to complete stop. After that we noticed we didn't even install the new spark plug. After installing the new plug we got nothing expect the back tires locking up. Out of sheer curiosity we removed and the plug again and it started to sound like it was kicking over again. What would cause this to happen? Why would it turn over without the spark and NOT with one?