2007 Polaris 550 LX Owners Manual - Page 131

TROUBLESHOOTING Problem Engine turns but fails to start Engine Troubleshooting Probable Cause Solution Faulty ignition • Install new spark plug(s). If engine still fails to start, check for spark. If there's no spark, SEE YOUR DEALER Make sure the fuel valve is on. Use the choke. See page 53. Make sure fuel tank contains fuel. Ice may be in fuel line, filter or pump. Add isopropyl alcohol to fuel system. On the standard Polaris carburetor, the choke will not function with the throttle depressed. See second item under Probable Cause" of Engine Continually Backfires". No fuel to engine Flooded engine (too much choke used) Poor engine compression • Hold throttle open, crank engine several times (may be necessary to change plug(s). • Mixture is too lean. A main jet that is too small will cause seizure resulting in loss of power. This indicates a major engine problem that must be repaired before operating. SEE YOUR DEALER. • Replace the plug(s). • Check fuel filter flow. Disconnect hose and drain 1/2 cup. Fuel flow should be steady and encompass the entire diameter of fuel line. If not, replace filter. • SEE YOUR DEALER. • SEE YOUR DEALER. • Change plug(s). • Dirt or ice may be in the fuel system (add deicer to non-ethanol fuel at all times to prevent icing). • SEE YOUR DEALER. Engine lacks power Fouled or defective spark plug(s) Fuel filter (loss of high RPM power) Incorrect clutching Carburetor and fuel pump Engine continually backfires Faulty plug(s) Carburetor / Fuel System Incorrect throttle freeplay or faulty switch 128