9926813 R04 - 2013-2016
RZR
570 Service Manual
© Copyright Polaris Industries Inc.
3.87
TROUBLESHOOTING
ENGINE
SPARK PLUG FOULING
• Spark plug cap loose or faulty
• Incorrect spark plug heat range or gap
• PVT system calibrated incorrectly/ components worn
or mis-adjusted
• Fuel quality poor (old) or octane too high
• Low compression
• Restricted exhaust
• Weak ignition (loose coil ground, faulty coil, or stator)
• Restricted air filter (main or pre-cleaner) or breather
system
• Improperly assembled air intake system
• Restricted engine breather system
• Oil contaminated with fuel
ENGINE TURNS OVER BUT FAILS TO START
• No fuel
• Dirt in fuel line or filter
• Fuel will not pass through fuel valve
• Fuel pump inoperative/restricted
• Tank vent plugged or pinched
• Engine flooded
• Low compression (high cylinder leakage)
• No spark (Spark plug fouled) ignition component
failure
ENGINE DOES NOT TURN OVER
• Dead battery
• Starter motor does not turn
• Engine seized, rusted, or mechanical failure
ENGINE RUNS BUT WILL NOT IDLE
• Restricted fuel supply
• Low compression
• Crankcase breather restricted
ENGINE IDLES BUT WILL NOT ACCELERATE
• Spark plug fouled/weak spark
• Broken throttle cable
• Obstruction in air intake
• Air box removed (reinstall all intake components)
• Incorrect flywheel installation or sheared flywheel key.
• Restricted exhaust system
• Cam worn excessively
ENGINE HAS LOW POWER
• Spark plug fouled
• Cylinder, piston, ring, or valve wear or damage (check
compression)
• PVT not operating properly
• Restricted exhaust muffler
• Cam worn excessively
PISTON FAILURE - SCORING
• Lack of lubrication
• Dirt entering engine through cracks in air filter or ducts
• Engine oil dirty or contaminated
EXCESSIVE SMOKE AND CARBON BUILDUP
• Excessive piston-to-cylinder clearance
• Worn rings, piston, or cylinder
• Worn valve guides or seals
• Restricted breather
• Air filter dirty or contaminated
PISTON FAILURE - SCORING
• Lack of lubrication
• Dirt entering engine through cracks in air filter or ducts
• Engine oil dirty or contaminated
SLOW ENGINE CRANKING
• Weak battery
• Loose Electrical connections
• Decompression Mechanism not functioning properly.
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
