I have a 91 Bayou klf 300 4X4 that will not start. When trying to start the starter will try to turn over but then sound like it locks up and grinds. When I hold up lever, not sure what lever is, on right side of motor the starter will turn continusly. When I pull the spark plug to check fire, the plug only sparks at first press of starter and when I let off starter. Any help is greatly appreciated. I am verry new to the atv scene so it is ok to assume I am an idiot.