Polaris Sportsman 450 2021 Owner's Manual page 182

TROUBLESHOOTING
ENGINE PINGS OR KNOCKS
POSSIBLE CAUSE
Poor quality or low octane fuel
Incorrect spark plug gap or
heat range
ENGINE RUNS IRREGULARLY, STALLS OR
MISFIRES
POSSIBLE CAUSE
Fouled or defective spark plug
Worn or defective spark plug
wires
Incorrect spark plug gap or
heat range
Loose ignition connections
Water present in fuel
Low battery voltage
Incorrect fuel
Clogged air filter
Clogged intake pre-filter
Other mechanical failure
180
Replace with recommended fuel
Set gap to specs or replace plug
Inspect, clean and/or replace spark plug
Your authorized dealer can assist
Set gap to specs or replace plug
Check all connections and tighten
Replace with new fuel
Recharge battery to 12.8 VDC
Replace with recommended fuel
Inspect and clean or replace
Inspect and clean (with soapy water) or replace
Your authorized dealer can assist
SOLUTION
SOLUTION