Engine Overheating - Polaris Sportsman 400 H.O. Owner's Manual

Engine Stops or Loses Power
Possible Cause
Out of fuel
Kinked or plugged fuel vent line
Water is present in fuel
Overuse of choke
Fouled or defective spark plug(s)
Worn or defective spark plug wires
Incorrect spark plug gap or heat range
Loose ignition connections
Low battery voltage
Incorrect fuel
Clogged air filter
Reverse speed limiter malfunction
Electronic throttle control malfunction
Other mechanical failure
Overheated engine

Engine Overheating

Possible Cause
Low radiator coolant level
Debris lodged in screen
Plugged Radiator
Obstructed cooling fan
TROUBLESHOOTING
Solution
Refuel, cycle key to ON position three
times for 5 seconds each, then start
Inspect and replace
Replace with new fuel
Inspect, clean and/or replace spark plugs
Inspect, clean and/or replace spark
plug(s)
See your dealer
Set gap to specs or replace plug
Check all connections and tighten
Recharge the battery to 12.8 VDC
Replace with fresh recommended fuel
Inspect and clean or replace
See your dealer
See your dealer
See your dealer
Clean radiator screen and core, clean
engine exterior, see your dealer
Solution
Add coolant.
Remove and clean the screen. Pull on the
top portion of the screen, then remove the
lower portion.
Use a garden hose to flush any debris
from the radiator fins. NOTE: High pres-
sure washers can deform the radiator fins
and reduce cooling efficiency.
Clean any debris or mud that may be
interfering with fan movement.
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