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  • Acerbis
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    • Caps & Vents

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    A properly functioning fuel cap and vent system is essential for safe, efficient fuel delivery. Worn, cracked, or incorrectly vented caps can cause fuel evaporation, pressure build-up, and flooding — all of which rob performance and create potential hazards. Our fuel cap and vent selection covers replacement caps and aftermarket upgrades for dirt bikes, ATVs, street bikes, and more.

    We carry caps from quality manufacturers including Acerbis, IMS, and Tusk, built to deliver a positive seal and smooth operation even after repeated use in muddy, wet, or dusty conditions. Billet aluminum and reinforced nylon options are available for riders who want a lasting upgrade over their stock plastic cap. Vented and non-vented variants are available to match your specific tank and system requirements.

    Browse our caps and vent selection and filter by make and model for a guaranteed fit.

    Frequently Asked Questions

    Will an IMS or Clarke replacement gas cap fit my stock OEM dirt bike tank?

    Most aftermarket fuel caps from IMS and Clarke are designed specifically for their own oversized tanks and do not interchange with original equipment manufacturer threads. If you are looking for a cap for a stock Honda CRF or Yamaha YZ tank, you must verify the thread pitch and diameter match the OEM specifications before purchasing. Always check the individual product description to confirm if a cap is listed as an OEM replacement or for use with an aftermarket fuel cell.

    What is the difference between a vented gas cap and a locking fuel cap for street and off-road bikes?

    A vented gas cap like those from Acerbis allows air to enter the tank as fuel is consumed, preventing a vacuum lock that could cause the engine to stall. Locking gas caps from brands like IMS provide added security against fuel theft and tampering, which is essential for dual-sport bikes frequently parked in public areas. Both styles are engineered to maintain proper pressure balance while ensuring a leak-proof seal during aggressive riding.

    How do I choose the correct gas cap size for my Acerbis or Safari long-range fuel tank?

    To ensure a leak-free fit, you should match the gas cap brand to your tank brand, as Safari and Acerbis often use proprietary large-thread designs for their high-capacity tanks. Most modern Acerbis tanks utilize a standard 2.0-inch or 'Small' cap size, while older or specialty Safari tanks may require custom oversized lids. Measuring the outer diameter of your tank's neck can help verify compatibility if the original model information is unavailable.

    Why does my dirt bike or ATV need a gas tank vent hose with a check valve?

    Gas tank vent hoses are critical for allowing the fuel system to breathe while preventing gas from spilling out of the cap during a rollover or steep incline. Brands like IMS offer vent lines with integrated one-way check valves that permit air intake but block fuel exit, protecting your bike's finish and reducing fire risks. These universal accessories fit almost any vented cap on dirt bikes, ATVs, and UTVs.

    Can I use a Rotopax fuel pack cap on a standard IMS or Clarke gas tank?

    Rotopax caps are specifically engineered for their portable fuel containers and are not compatible with the threaded necks found on IMS, Clarke, or Safari motorcycle tanks. For the best seal and safety, always use the dedicated replacement cap designed for your specific fuel cell brand to prevent evaporation and leaks. When buying a replacement, double-check if your tank requires a screw-on style or a quarter-turn bayonet style lid.