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MAINTENANCE
2.13
NOTE: The bowl drain screw is located on the bottom
left side of the float bowl.
1. Turn fuel valve to the off position.
2. Place a clean container beneath the bowl drain
spigot or bowl drain hose.
ON
OFF
RES
Fuel V alve
3. Turn drain screw out two turns and allow fuel in
the float bowl and fuel line to drain completely.
4. Inspect the drained fuel for water or sediment.
5. Tighten drain screw.
6. Turnfuelvalveto“ON”.
7. Start machine and check for leaks.
NOTE: If there is a tube attached, it must be
reattached as this will effect engine performance.
COMPRESSION TEST
NOTE: This Polaris 4-Stroke engine is equipped with
an automatic decompressor . Compression readings
will vary in proportion to cranking speed during the
test. Average compression (measured) is about
70--90 psi
during a compression test.
Smooth idle generally indicates good compression.
Low engine compression is rarely a factor in running
condition problems above idle speed. Abnormally
high compression can be caused by a decompressor
malfunction, or worn or damaged exhaust cam lobes.
Inspect camshaft and automatic decompression
mechanism if compression is abnormally high.
A cylinder leakage test is the best indication of engine
condition on models with automatic decompression.
Follow tester manufacturer’s instructions to perform
a cylinder leakage test. (Never use high pressure
leakage testers as crankshaft seals may dislodge and
leak).
Cylinder Compression
Standard 70--90 PSI
Cylinder Leakage
Service Limit: 10 %
(Inspect for cause if leakage exceeds 10%)
ENGINE MOUNTS
Inspect rubber engine mounts for cracks or damage.
ENGINE FASTENER TORQUE
Check engine fasteners and ensure they are tight.
BATTERY MAINTENANCE
WARNING
Battery electrolyte is poisonous. It contains
sulfuric acid. Serious burns can result from
contact with skin, eyes or clothing. Anti-
dote:
External: Flush with water .
Internal: Drink large quantities of water or
milk. Follow with milk of magnesia, beaten
egg, or vegetable oil. Call physician im-
mediately.
Eyes: Flush with water for 15 minutes and
get prompt medical attention.
Batteries produce explosive gases. Keep
sparks, flame, cigarettes, etc. away. V enti-
late when charging or using in an enclosed
space. Always shield eyes when working
near batteries. KEEP OUT OF REACH OF
CHILDREN.
NOTE: All 2003 Trail Boss ATV batteries are
Maintenance--Free design and construction. All
Maintenance--Free batteries are fully charged and
tested at the factory before installation. Expected
shelf life is 6-- 8 months depending on storage
conditions. As a general rule before placing the
battery into service, check the battery condition
and charge accordingly .