Polaris 340 Classic Owner's Manual page 131

Engine Troubleshooting
Problem
Engine turns
but fails to start
Engine lacks
power
Engine
continually ti ll
backfires
Engine requires
more than
normal pulls to
start
Probable Cause
Faulty ignition
No fuel to engine
Flooded engine
(normal situation
caused by too much
choking)
Poor engine
compression
Fouled or defective
spark plug(s)
Fuel filter (loss of
high RPM power)
Incorrect clutching
Carburetor and fuel
pump
Faulty plug(s)
Carburetor
Poor gasoline or not
enough fuel getting to
engine
TROUBLESHOOTING
Solution
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
standard Polaris carburetor, the choke will
not function with the throttle depressed.
See second item under "Probable Cause" of
"Engine continually backfires".
Hold throttle open, crank engine several
times (may be necessary to change plug(s),
however, the plug(s) may operate satisfac-
torily when dried).
Running a mixture too lean (too small 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.
Change plug(s).
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
output. SEE YOUR DEALER.
Change plug(s).
Dirt or ice may be in fuel system. SEE
YOUR DEALER. (Deicer/isopropyl
should be added to non-ethanol fuel at all
times for assurance against fuel line icing.)
Replace with fresh winter fuel.
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