Polaris 2003 Universal Snowmobiles - Manual (Page 177)

175
TROUBLESHOOTING
Engine Troubleshooting
Problem Probable Cause Solution
Engine turns
but fails to start Faulty ignition
No fuel to engine
Flooded engine
(normal situation
caused by too much
choking)
Poor engine com-
pression
-Remove spark plug(s) and replace with new
plug(s). If engine still fails to start, check for
spark; if no spark SEE YOUR DEALER.
-Make sure the fuel valve is “ON”. Check
tank level and fill up with correct fuel.
-Ice in fuel line, filter, or pump. On the stan-
dard Polaris carburetor, the choke will not
function with the throttle depressed. See se-
cond item under “Probable Cause” of “En-
gine continually backfires”.
-Hold throttle open, crank engine several
times (may be necessary to change plug(s),
however, the plug(s) may operate satisfactori-
ly when dried).
-Running too lean a mixture (too small a
main jet will cause seizure resulting in loss of
power). SEE YOUR DEALER. This indi-
cates a major engine problem that must be
repaired before engine is run.
Engine lacks
power Fouled or defective
spark plug
Fuel filter (loss of
high RPM power)
Incorrect clutching
Carburetor and fuel
pump
-Change and test operation.
-Check fuel filter flow. Disconnect hose and
drain about 1/2 cup. Fuel flow should be
steady and encompass the entire diameter of
fuel line. If not, replace filter.
-SEE YOUR DEALER.
-There’s no adjustment to change power out-
put. SEE YOUR DEALER.
Engine
continually
backfires Faulty plug(s)
Carburetor -Change plug(s)
-Dirt or ice in fuel system. (Deicer should be
added to non-ethanol fuel at all times for as-
surance against fuel line icing.)
Engine requires
more than
normal pulls to
start Poor gasoline or
not enough fuel
getting to engine -Replace with fresh winter fuel.