Polaris Sportsman 570 EFI Owner's Manual page 100

MAINTENANCE
Breather Valve/Hose
The breather valve is on the hose that runs between the engine and air
box. See illustration on page 97.
1. Remove the left side panel. See page 93.
2. Remove the hose clamps from the valve and pull the valve out of
the hoses.
3. Inspect the valve for debris. Blow gently through the valve to check
for clogging. Replace a damaged or clogged valve.
4. Check the hoses for cracks, deterioration, abrasion, or leaks.
Replace as needed.
5. Reinstall the valve and hose clamps.
NOTICE: Operation of your vehicle without a breather valve can cause engine
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damage. Always reinstall the breather valve after removing it for
service.
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