Make sure you have at least 12V at the battery, then follow positive wire from battery to solenoid and check for 12V. If 12V is present at the solenoid put your volt meter on other positive post supplying 12V to starter while turning ignition to start. If 12 volts are present this says the leads and solenoid are good. Pull the spark plug then try to crank engine if engine does not turn over pull starter and using a jump box or jumper leads run 12 volts to pos. terminal of starter and while holding starter connect a ground from starter housing to engine. If starter still does not spin your starter is bad, if it spins slowly it is weak, if it spins fast make sure you can turn engine over by hand. Also with starter removed using a finger try to spin small gear inside cavity in engine. It should spin freely in one direction and lock up in the opposite direction. This will tell you your starter clutch isn't locked. Sounds like your starter is bad though
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