Polaris ACE 150 EFI 2019 Owner's Manual page 106

TROUBLESHOOTING
ENGINE TURNS OVER, FAILS TO START
POSSIBLE CAUSE
Out of fuel
Water is present in fuel
Old or non-recommended fuel
Fouled or defective spark plug
No spark to spark plug
Water or fuel in crankcase
Clogged Fuel Filter
Low battery voltage
Mechanical failure
ENGINE BACKFIRES
POSSIBLE CAUSE
Weak spark from spark plug
Incorrect spark plug gap or
heat range
Old or non-recommended fuel
Incorrectly installed spark plug
wires
Mechanical failure
Loose ignition connections
Water present in fuel
Exhaust system leak
ENGINE PINGS OR KNOCKS
POSSIBLE CAUSE
Poor quality or low
octane fuel
Incorrect ignition timing
Incorrect spark plug gap
or heat range
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Refuel
Drain the fuel system and refuel
Replace with fresh recommended fuel
Inspect plug and replace if necessary
Inspect plug and replace if necessary
Your POLARIS dealer can assist
Your POLARIS dealer can assist
Recharge the battery to 12.8 VDC
Your POLARIS dealer can assist
Inspect, clean and/or replace spark plug
Set gap to specs or replace plug
Replace with fresh recommended fuel
Your POLARIS dealer can assist
Your POLARIS dealer can assist
Check all connections and tighten
Replace with fresh recommended fuel
Your POLARIS dealer can assist
Replace with recommended fuel
Your authorized dealer can assist
Set gap to specs or replace plugs
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SOLUTION
SOLUTION
SOLUTION