Small Engine Won't Crank: 

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. LOOSE BATTERY  LEAD CONNECTIONS

. LOW OR DISCHARGED BATTERY CHARGE

. LOW BATTERY AMPERAGE

. STARTING LEADS REVERSED

. WIRING HARNESS FUSE BLOWN

. KEYSWITCH WIRED INCORRECTLY

. MALFUNCTIONING SAFETY SWITCH

. INCORRECT WIRING HARNESS OR WIRED WRONG

. LOOSE STARTING CABLE CONNECTORS

. WRONG OR CORRODED CONNECTORS

. BAD STARTER OR SOLENOID

. ELECTRIC CLUTCH AIR GAP WRONG

. DRIVE PULLEY AGAINST ENGINE PTO FACE

. WEDGED DRIVE BELT

. DRIVE BELT TENSION TOO TIGHT

. STARTING TORQUE TOO HIGH FOR STARTER

. INOPERATIVE AUTOMATIC COMPRESSION RELEASE

. COMBUSTION CHAMBER FLOODED WITH OIL/GAS

. NO OIL IN CRANKCASE CAUSING SEIZED ROD

. DRIVE SHAFT COUPLING FORCING ENGINE SHAFT AGAINST INTERNAL THRUST FACE ELIMINATING CRANKSHAFT END PLAY

. TRANSMISSION BRAKES TOO TIGHT