Breather Valve/Hose
The breather valve is on the hose that runs between the engine and air box.
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Remove the left side panel.
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Remove the hose clamps from the valve and pull the valve out of the hoses.
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Inspect the valve for debris. Blow gently through the valve to check for clogging. Replace a damaged or clogged valve.
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Check the hoses for cracks, deterioration, abrasion, or leaks. Replace as needed.
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Reinstall the valve and hose clamps.