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2.17
MAINTENANCE
2
Fuel Filter
The fuel filter should be replaced in accordance with the
Periodic Maintenance Chart.
1. Locate filter at the front of the ATV. NOTE: Remove
access panels if necessary.
2. Remove fuel lines from filter.
3. Install new filter onto fuel lines with arrow pointed in
direction of fuel flow.
4. Install clamps on fuel line (if required).
5. Turn ignition to “ON”.
6. Start engine and inspect for leaks.
Compression Test
NOTE: 450/500 4-Stroke engines are equipped with an
automatic decompressor. Compression readings will
vary in proportion to cranking speed during the test.
Average compression (measured) is about 60-90 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
manufacturer’s instructions to perform a cylinder leakage test.
(Never use high pressure leakage testers as crankshaft seals may
dislodge and leak).
Engine Mounts
Inspect rubber engine mounts (A) for cracks or damage. Check
engine fasteners and ensure they are tight.
EFI Example
Cylinder Compression
Standard 60-90 PSI
Cylinder Leakage
Service Limit: 10%
(Inspect for cause if leakage exceeds 10%)
A
A
A