Excessive Smoke and Carbon Buildup
• Excessive piston-to-cylinder clearance
• Wet sumping due to over-full crankcase
• Worn rings, piston, or cylinder
• Worn valve guides or seals
• Restricted breather
• Air filter dirty or contaminated
Low Compression
• Cylinder head gasket leak
• No valve clearance (cam wear)
• Cylinder or piston worn
• Piston rings worn, leaking, broken, or sticking
• Bent valve or stuck valve
• Valve spring broken or weak
• Valve not seating properly (bent or carbon
accumulated on sealing surface)
• Rocker arm sticking
Backfiring
• Fouled spark plug or incorrect plug or plug gap
• Exhaust system air leaks
• Valve sticking
• Ignition system faulty:
Spark plug cap cracked / broken
Ignition coil faulty
Ignition or kill switch circuit faulty
Poor connections in ignition system
Ignition timing incorrect
Sheared flywheel key
Cooling System
Overheating
Temperature Too Low
Leak at Water Pump Weep Hole
9923523 - 2012 RANGER RZR 570 Service Manual
© Copyright 2011 Polaris Sales Inc.
ENGINE / COOLING SYSTEM
• Low coolant level
• Air in cooling system
• Wrong type/mix of coolant
• Faulty pressure cap or system leaks
• Restricted system (mud or debris in radiator fins
causing restriction to air flow, passages blocked in
radiator, lines, pump, or water jacket, accident
damage)
• Lean mixture (vents, fuel pump or fuel valve)
• Fuel pump output weak
• Electrical malfunction
• Water pump failure/ Loose impeller
• Thermistor failure
• Cooling fan inoperative or turning too slowly
(perform current draw test)
• Low oil level
• Spark plug incorrect heat range
• Faulty hot light circuit
• Thermostat stuck closed or not opening
completely
• Radiator is missing its internal diverter plate not
allowing coolant to flow through entire radiator
• Thermostat stuck open
• Faulty water pump mechanical seal (coolant leak)
• Faulty pump shaft oil seal (oil leak)
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