101
TROUBLESHOOTING
Engine Troubleshooting
Problem
Probable Cause Solution
Engine turns but fails
to start
Faulty ignition
• Install new spark plug(s). If engine
still fails to start, check for spark. If
there's no spark, SEE YOUR
DEALER.
No fuel to engine
• Make sure the fuel valve is on.
• Use the choke.
• 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 car-
buretor, the choke will not function
with the throttle depressed. See sec-
ond item under Probable Cause" of
Engine Continually Backfires".
Flooded engine (too
much choke used)
• Hold throttle open, crank engine
several times (may be necessary to
change plug(s).
Poor engine com-
pression
• Mixture is too lean. A main jet that
is too small will cause seizure result-
ing in loss of power. This indicates a
major engine problem that must be
repaired before operating. SEE
YOUR DEALER.
Engine lacks power
Fouled or defective
spark plug(s)
• Replace the plug(s).
Fuel filter (loss of
high RPM power)
• 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.
Incorrect clutching
• SEE YOUR DEALER.
Carburetor and fuel
pump
• SEE YOUR DEALER.
Engine continually
backfires
Faulty plug(s)
• Change plug(s).
Carburetor / Fuel
System
• Dirt or ice may be in the fuel system
(add deicer to non-ethanol fuel at all
times to prevent icing).
Incorrect throttle
freeplay or faulty
switch
• SEE YOUR DEALER.
