Product Description
Maintain the efficiency of your engine’s ventilation system with the Genuine Royal Enfield One-Way Valve. This essential OEM component (Part No: 1040409/C) is a small but critical check valve integrated into the breather line of BS4-compliant Unit Construction Engines (UCE).
The 1040409/C functions as a “directional gatekeeper” for the crankcase. It allows air and oil fumes to escape the crankcase into the airbox but prevents them from flowing backward into the engine. This one-way action reduces internal pressure, prevents oil mist from fouling the air filter, and helps maintain a stable engine idle. As a genuine Royal Enfield part, it is made from heat-resistant plastic to withstand the high operating temperatures of air-cooled engines and is designed for a direct push-fit into the original rubber breather hoses.
Key Features:
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OEM Breather Control: 100% authentic Royal Enfield part, ensuring the correct valve opening pressure for BS4 emissions standards.
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Directional Flow: Effectively vents crankcase pressure while blocking the return of oily vapors and contaminants.
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Durable Materials: Constructed from oil- and heat-resistant plastic with a secure, leak-proof internal diaphragm.
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Direct Installation: Designed as a simple push-fit replacement for the standard breather hose assembly.
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Idle Stability: Helps prevent erratic idling and “stalling” issues often caused by incorrect crankcase pressure or vacuum leaks.
Product Specifications:
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Brand: Royal Enfield Genuine Parts
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Part Number: 1040409/C (Supersedes 1040409)
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Material: High-Grade Polymer
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Color: Black / Blue accents
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Compatibility:
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✅ Royal Enfield Classic 350 BS4 (≈2016–2020)
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✅ Royal Enfield Bullet 350 / Standard 350 BS4
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✅ Royal Enfield Bullet 350 ES BS4
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✅ Royal Enfield Electra 350 BS4
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✅ Royal Enfield Thunderbird 350 BS4
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❌ Note: Not compatible with the newer J-Series (Meteor/Hunter) or 650 Twins.
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