How to Change the Coolant in a 2018 GAS GAS TXT GP 300: Step-by-Step Guide
Regularly changing the coolant in your 2018 GAS GAS TXT GP 300 ensures optimal engine temperature, reliability, and performance on the trail or in competition. The TXT GP 300 is engineered for trials – its liquid-cooled, single-cylinder 2-stroke engine relies on fresh coolant for both protection and efficient heat dissipation. This proprietary MotoSport guide covers the complete coolant change process, including critical details specific to this model year and generation.
Preparation
- Allow the engine to cool completely. Hot coolant is dangerous to handle and pressure can build in the system. Never remove the radiator cap from a hot engine.
- Gather necessary items: fresh, light-alloy compatible coolant (ethylene glycol type, pre-mixed or mix yourself per product label), basic hand tools, a catch pan, shop towels, and eye protection.
Draining the Old Coolant
- Remove the seat and fuel tank per the owner—s manual instructions to access the radiators and water pump area. Typically, you–ll need to release bolts or fasteners at front/rear and unplug any lines as needed.
- Locate the water pump hose on the right-hand side of the engine. This is the dedicated coolant drain point.
- Position your catch pan under the hose. Loosen the clamp and remove the hose carefully to allow coolant to flow out completely. If necessary, remove the radiator cap at this stage (with engine cold) to aid drainage by letting air in.
Inspecting the System
- With coolant drained, inspect hose condition, clamps, and radiator for cracks or leaks. Wipe away old residue and note any debris, sludge, or metallic shavings — these can indicate component wear.
- For the TXT GP 300, also check the cylinder head for potential warpage if you observe recurring overheating (max warpage is 0.05 mm).
Refilling with New Coolant
- Reinstall the water pump hose and tighten its clamp securely.
- Slowly pour new coolant into the radiator until filled to the neck. Tilt the bike gently side to side to help release trapped air.
- Allow several minutes – add more coolant if the level drops. Securely refit the radiator cap.
Bleeding the Cooling System
- To properly bleed air from the trials-specific cooling circuit, start the engine with radiator cap on. Let it idle and warm up for several minutes, then briefly shut off and check coolant level again.
- Top off if required – repeat if necessary until the level remains stable with no bubbling.
Model-Specific Notes for the TXT GP 300
- This bike uses a high-compression, compact cooling circuit that must be free of air pockets or you risk overheating on technical obstacles.
- Official specs call for coolant changes at least once per year or every 40 hours of riding in harsh environments for maximum reliability and to avoid corrosion.
- The correct coolant is vital–do not use tap water or automotive anti-freeze not rated for motorcycle aluminum engines.
- Leaking, worn hoses, or persistent overheating after a coolant change may hint at a deeper head gasket or water pump seal issue. Seek professional diagnosis if these occur.
Final Safety & Maintenance Tips
- If coolant contacts your skin or eyes, flush with water immediately and seek medical help as needed.
- Dispose of used coolant responsibly. Never pour down drains–use appropriate recycling facilities.
- Record your maintenance date and check coolant condition regularly for peace of mind on any trail or course.
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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.