Snowmobile Polaris PRO X (2003 year). Manual - part 24
ENGINE
2.64
Troubleshooting
PROBLEM
PROBABLE CAUSE
Will not start/
hard starting
-Check ignition switch for run position, moisture contamination
-Check auxiliary shut-off switch operation
-Check fuel supply
-Check wiring from engine to coil(s) or spark plug(s)
-Check spark plug(s)
-Disconnect engine connector to eliminate any shorts that might be in the system
-If starter won’t work (electric models), check wires from starter solenoid and battery or check battery
and battery cables
-Open or broken reed valves
Low compres-
sion
-Crankcase plug is out
-Head gasket faulty
-Poor ring sealing, piston damage
No spark
-Spark plug fouled
-Secondary coil bad or wires disconnected
-Primary coil shorted or open
-Ignition switch shorted, contaminated with moisture
-Auxiliary switch shorted or contaminated with moisture
Engine idles but
no acceleration
-Restricted fuel flow/air flow
-Clogged main jet
-Timing
-Clutching
Engine runs but
fails to reach
maximum RPM
-Clogged fuel filter
-Incorrect track tension
-Incorrect main jet
-Throttle slides not fully open
-Chain too tight
-Clutching
-Excessive driveline friction (Hi-Fax overheating)
Engine runs but
fails to idle
-Incorrect air mixture setting
-Throttle stop screw incorrectly adjusted
-Dirt in pilot jet
-Low compression
-Tight belt
-Piston damage
-Chokes not seating
Engine runs,
but overloads
with fuel
-Chokes are not seating
-Fuel pump diaphragm is ruptured (caused by engine backfiring)
-Carburetor slides are not synchronized
-Too large main jet
-Needle and seat not seating properly
-Incorrect float level
-Check reed valve condition
Carburetion and
plug fouling
-If a lot of riding is on trails, and plugs foul and get black when doing so, verify
all tune up adjustments:
carb sync, oil pump adjustment, pilot screw setting, spark plug type and gap, venting for carbs, proper
jetting for altitude and temperature, belt tension, clutch operation. If tune up items are correct, check:
float level, jet needle position, jet needle wear, inlet needle and seat wear, etc.
Engine runs but
overheats
-Coolant level
-Incorrect main jet
-Incorrect timing
-Incorrect spark plug
-Water pump belt loose or broken
-Cooling restriction
-Air in cooling system
-Inadequate snow for cooling (ice and/or marginal conditions)