Polaris 9919510 Owner's Manual For Maintenance And Safety page 173

TROUBLESHOOTING
Engine Runs Irregularly, Stalls or Misfires
Possible Lean Fuel Mixture Cause
Low or contaminated fuel
Low octane fuel
Old, poor or non-recommended fuel
Clogged fuel valve screen
Incorrect jetting
Possible Rich Fuel Mixture Cause
Overuse of choke
Fuel is very high octane
Incorrect jetting
Plugged, dirty or wet air filter
170
Solution
Add or change fuel, clean the fuel system
Replace with recommended fuel
Replace with recommended fuel
See your Polaris dealer
See your Polaris dealer
Solution
Inspect, clean and/or replace spark plugs
Replace with recommended lower octane fuel
See your Polaris dealer
Clean pre-filter, replace main filter as needed