With respect, if you’ve over cranked it you haven’t followed the directions. Mine often doesn’t start right up. Typically I prime for about 10 or 15 seconds, pause, crank for about 15 seconds, pause for about another 15 seconds then crank again and it starts right up. Not to say that there isn’t something wrong with yours. But it’s a typical small engine and you can troubleshoot with typical techniques. Disconnect the fuel line and crank to see if the fuel pump is working. Remove the float bowl and check that it’s full. Check for spark at the plug. See if the plug is wet with fuel/flooded. That sort of thing. Good luck.
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