Why ATV Riders Prefer Secondary Airbox Delete Plates

Secondary Airbox Delete Plates May 7, 2026

Secondary Airbox Delete Plates for Honda Foreman and Rubicon

Honda ATV riders sometimes face an issue where their engines bog down or stall after deep water crossings. It usually stems from the secondary airbox system. The system is designed to reduce intake noise but acts as a trap for moisture and debris.

According to a source, water ingestion is a significant cause of engine hesitation and long-term internal damage in utility machines.

At Vessel Powersports, we provide a permanent fix for this vulnerability. We remove the weak point entirely. Our plates keep your intake sealed and secure. It stays that way regardless of the terrain you choose to tackle.

Understanding the Secondary Airbox System

The secondary airbox is a small plastic chamber located near the primary air intake on many Honda models. Its main job is to act as a resonator. This helps keep the engine quiet during low-speed operation by canceling out specific sound frequencies. While quiet operation is nice for casual trail riding, it creates a massive headache for riders who enjoy mud and water.

This chamber is connected to the main air intake via a series of hoses. It can easily collect water if the ATV is submerged or even during a high-pressure wash at home because of its design. Once water gets inside this secondary chamber, it has nowhere to go but into your intake tract. This results in a "stumble" when you hit the throttle, or worse, a complete engine stall in the middle of a creek.

Why Removal is Necessary for Honda Riders

If you ride a Honda Recon, Rancher, Foreman, or Rubicon, you know these machines are built like tanks. However, even a tank has its weaknesses. The secondary airbox is essentially a "water bucket" waiting to be filled. Here is why riders choose to delete it:

Prevents Engine Hydro-lock: By removing the secondary chamber, you eliminate a primary entry point for water that bypasses the main filter.
Simplifies the Intake System: Fewer hoses and chambers mean fewer places for air leaks or clogs to develop over time.
Improves Throttle Response: Many riders report a crisper feel when hitting the gas because the air path is more direct and less turbulent.
Easier Maintenance: Cleaning your airbox area becomes much faster without the extra plastic cluttering the frame and trapping mud.
Enhanced Reliability: Eliminating a failure point is the best way to ensure your Honda runs in the deep woods.

For those riding the latest heavy-duty models, our Secondary Airbox Delete Plates for 2014+ Honda Foreman and Rubicon offer a precision-fit solution that seals the system perfectly.

Performance Gains on Foreman and Rubicon Models

The Foreman and Rubicon are the workhorses of the Honda lineup. They carry heavy loads, push snow plows, or pull trailers through thick mud. These engines need a steady, unrestricted supply of air to maintain torque and cooling. The secondary airbox can sometimes create turbulence in the intake stream. Air bounces around the resonator and causes the problem.

By deleting it, you allow the engine to breathe more naturally through a straight path. This does not turn your ATV into a race bike, but it does ensure the engine runs at its most efficient level under heavy load. A consistent air-to-fuel ratio is key to preventing overheating during slow-speed technical crawls.

The Installation Process

Installing a delete plate is one of the easiest DIY projects for a Honda owner. You do not need specialized tools or a mechanical degree to get it done in your garage.

Access the Intake: Remove the seat and side panels to get a clear view of the airbox.
Identify the Chamber: Locate the secondary air chamber and the hose connecting it to the main intake boot.
Removal: Carefully disconnect the hoses and remove the plastic chamber from its mounting bracket.
Sealing: Place the delete plate over the opening in the main airbox where the hose used to connect.
Final Check: Secure it with the provided hardware to create an airtight seal and ensure no dust can bypass the filter.

Secondary Airbox Delete Plates for Honda ATV

Longevity and Engine Health

Honda is famous for reliability and longevity. When water sits in a secondary airbox, it creates a humid environment that can degrade your main air filter much faster than normal. This moisture can also lead to light surface rust on the intake valves if the machine sits for a while after a wet ride.

A delete plate is a "set it and forget it" upgrade. Once it is installed, you never have to worry about that specific part of your intake failing or filling up again. It is a rugged solution for riders who refuse to stay on the dry path and want to push their machines to the limit.

Optimizing for Deep Water

Many Honda owners combine a secondary airbox delete with a full snorkel system. If you are planning on going "deep," the secondary airbox delete is not just an option; it is a requirement. Even with a snorkel, if that secondary chamber is still attached, a loose hose or a crack in the plastic can lead to disaster. Streamlining the intake is the first step in building a truly submersible machine. It allows you to focus on the trail ahead rather than worrying about what is happening under your seat.

Equip Your Honda ATV with Reliable Off-Road Upgrades

When you push a Honda Rancher or Foreman to its limits, you need components that match that legendary durability. At Vessel Powersports, we specialize in engineering high-performance aftermarket solutions designed specifically for the Honda community. Our team lives for the mud, and we understand exactly where factory parts fall short during deep-water exploration.

Whether you are looking for heavy-duty drivetrain components, high-clearance floorboards, or our signature radiator relocation kits, we have you covered. Our in-house experts are always available to offer script-free advice to ensure your rig is truly trail-ready.

Explore our full catalog of specialized Honda parts and upgrade your intake system to keep your adventures moving forward.

Frequently Asked Questions

1. Does removing the secondary airbox affect the engine tuning?

No, it does not require a re-tune. The plate simply streamlines the intake path without altering the air-to-fuel ratio, keeping your engine running safely and efficiently.

2. Can I install the delete plate on a Recon without removing the entire airbox?

Yes, you can. Accessing the connection point only requires removing the seat and side plastics. This makes it a quick, non-permanent modification for any owner.

3. Is the delete plate compatible with stock snorkels on an ATV?

It works perfectly with factory and aftermarket setups. By sealing the resonator hole, you ensure your snorkel system remains truly airtight during deep water crossings.

4. Do Recon require different plates than a Rubicon?

Yes, airbox designs vary. Always verify the fitment for your specific Honda Recon, Rancher, Foreman, or Rubicon before purchasing to ensure a vacuum-tight seal.

Priyanka Sharma

previousTop 6 Off-Road Trails to Explore in Maine

nextHow a Gear Selector Shift Gate Improves UTV Shifting Performance

Contact Support

Cart (5 items)