Air Filter Cleaning – Replacement Guide for 2021 GAS GAS TXT-Racing-300
Shop parts for a 2021 GAS GAS TXT-Racing-300 Dirt Bike.
The air filter on the 2021 GAS GAS TXT-Racing-300 is the first line of defense against dirt and debris, ensuring your engine receives clean air for optimal combustion and performance. Regular servicing of the air filter is crucial on trials bikes like the TXT-Racing-300, given their off-road use and exposure to dusty conditions. This MotoSport.com guide provides step-by-step OEM-informed instructions tailored specifically for the unique features and needs of your bike.
When to Clean or Replace Your Air Filter
- Clean the air filter after every 2–5 hours of riding in dusty or wet conditions, or after each ride if exposed to significant dust or water splashes.
- Replace the air filter at least once per season or sooner if it shows tears, permanent staining, or a loss of foam integrity.
- Always inspect after racing, extreme use, or if the engine seems to lose power unexpectedly.
Required Tools & Supplies
- 8mm socket or T-handle
- Clean, lint-free rags
- Air filter-specific cleaning solution or mild soap
- Foam filter oil (high-tack, dirt bike-specific)
- Grease (for airbox sealing surfaces)
- Replacement air filter (if necessary)
- Gloves to protect hands from chemicals
Removing the Air Filter Box & Air Filter
- Remove the seat by releasing the rear latch and lifting it away from the frame.
- Locate the air filter box cover beneath the seat. Remove the retaining screws or clips using the 8mm socket or T-handle.
- Carefully lift off the air box cover–watch for attached breather hoses or electrical connectors.
- Unscrew or unclip the air filter retainer tray.
- Gently pull the air filter out of the air box, being careful not to allow dirt or debris to drop into the intake tract.
Cleaning the Air Filter
- Tap the filter gently to dislodge loose dirt, taking care not to damage the foam.
- Submerge the dirty filter in a container of cleaning solution or mild, warm soapy water.
- Knead–do not wring or twist–the filter until all visible dirt and oil is removed.
- Rinse thoroughly with clean water until no soap remains.
- Allow the filter to air dry completely, away from direct sunlight or heat sources.
Inspecting & Oiling the Air Filter
- Inspect the foam for tears, hardened areas, or glue separation. Replace if any defect is found.
- Apply foam filter oil evenly, working it thoroughly into the entire filter, including all folds and edges. The filter should be uniformly tacky, not dripping.
- Apply a thin bead of grease to the air filter flange that mates with the air box to ensure a dust-proof seal.
Reinstalling the Air Filter
- Insert the clean, oiled, and greased filter into the air box, ensuring full contact with the sealing ring.
- Reattach the air filter retainer tray securely.
- Replace the air box cover, making sure all tabs align, and tighten screws or secure clips evenly.
- Refit the seat, latching it firmly.
Special TXT-Racing-300 Considerations
- This model's air box is designed for quick access – avoid overtightening fasteners to prevent cracking plastic components.
- Always inspect the air intake boot for cracks or loose fittings, which could allow unfiltered air into the engine.
- The 2021 TXT-Racing-300 benefits from a slightly larger air filter surface area than prior years–make sure to use the correct OEM or high-quality aftermarket replacement for best fit and sealing.
- Do not use petroleum-based or automotive oils–only use foam filter-specific oils to prevent filter degradation and engine wear.
General Tips for Optimal Performance
- After heavy cleaning or water crossing rides, check the air filter more frequently for moisture or mud.
- Always keep a pre-oiled spare filter on hand for quick changes during multi-day riding events.
- Inspect the air box for water or debris after extreme weather rides and dry completely before reassembly.
Keeping your 2021 GAS GAS TXT-Racing-300 air filter clean and properly maintained is vital for both performance and long-term reliability. Genuine parts and regular filter service help ensure every ride is at its best.
Related Shopping Categories
Shop Air Filters for a 2021 GAS GAS TXT-Racing-300 Dirt Bike.
Shop Air Filter Oil for a 2021 GAS GAS TXT-Racing-300 Dirt Bike.
Shop Air Box Covers for a 2021 GAS GAS TXT-Racing-300 Dirt Bike.
Shop Tools for a 2021 GAS GAS TXT-Racing-300 Dirt Bike.
Shop Intake Parts for a 2021 GAS GAS TXT-Racing-300 Dirt Bike.
Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.