How to Change the Coolant in a 2021 GAS GAS TXT Racing 125
Routine coolant changes are crucial for protecting your 2021 GAS GAS TXT Racing 125 from overheating, corrosion, and premature wear. The TXT Racing 125 uses a high-performance liquid-cooled two-stroke engine, and its compact chassis means access is tight–but with proper steps, the job is straightforward.
What Makes TXT Racing 125 Coolant Maintenance Unique
- Radiator cap placement: The cap is tucked under the fuel tank for a more compact trials design. You must remove any interfering plastic for full access.
- Coolant capacity: This trials bike uses less coolant than motocross models; avoid overfilling to prevent overflow or uneven pressure.
- No radiator fan: The TXT 125 depends on consistent coolant quality and proper filling, since there is no fan for additional airflow on low-speed technical sections.
Step-by-Step Coolant Change Instructions
- Prepare the Bike: Ensure the engine is cold to prevent burns and pressure spray. Position the motorcycle upright on a stable, level surface. Remove any plastics that obstruct the radiator cap according to the owner's manual.
- Remove the Radiator Cap: Carefully twist and remove the radiator cap. This relieves any remaining pressure and exposes the fill neck.
- Locate & Remove the Drain Screw: Place a drain pan beneath the water pump area. Locate the drain screw on the water pump cover (Usually an M6 bolt). Loosen the bolt gently—coolant will begin to drain out. Remove the screw fully for faster draining. Wait until all coolant is out.
- Inspect and Clean: Check the drained coolant for dirt, oil contamination, or metallic flakes. Clean around the drain area and replace the screw, using a new seal ring if needed. Tighten to approximately 10 Nm.
- Flush if Necessary: If the coolant was especially dirty, flush the system with clean distilled water. Repeat the draining process until water runs clear.
- Refill with Coolant: Pour manufacturer-recommended coolant slowly into the radiator neck—avoid air bubbles by tilting the bike slightly if needed. Fill up to the bottom edge of the neck; do not overfill.
- Bleed Air from the System: Squeeze the radiators gently and rock the bike side-to-side to help air escape. Start the engine briefly with the cap off, monitoring coolant flow. Shut off the engine and refill as needed.
- Replace Radiator Cap & Test: Secure the radiator cap—ensure no cross-threading. Reinstall any removed plastics. Start the engine and let it run until warm, then check for leaks and double-check the coolant level after cooling down.
Coolant Change Interval – Tips for TXT Owners
- Change frequency: Inspect coolant every 15 operating hours and change it annually, or immediately if you notice contamination, overheating, or loss of coolant.
- Coolant type: Use a premixed, silicate-free motorcycle coolant. Avoid tap water—use only distilled water for mixing or flushing.
- Trial-specific care: Mud, debris, and slow-speed technical riding can stress the cooling system. Keep radiator fins clean and straighten if bent.
- Safe handling: Coolant is toxic. Avoid contact with skin and eyes, and dispose of used coolant using proper environmental procedures.
Proprietary MotoSport Maintenance Note
The TXT Racing 125 is engineered for high-torque, technical riding, so it runs hotter during extended slow maneuvers. Maintaining proper coolant level and cleanliness is critical for engine longevity. If you notice frequent loss of coolant or overheating, inspect hoses, water pump seals, and the radiator for small leaks specific to the tight packaging of trials bikes.
Related Shopping Categories
Shop Radiator Hoses for Your Ride
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.