How to Change the Coolant in a 2020 Husqvarna TX300i: A Complete Guide
Shop parts for a 2020 Husqvarna TX300i Dirt Bike.
Changing the coolant on your 2020 Husqvarna TX300i ensures your engine runs reliably, especially during demanding rides. This unique two-stroke features an electronically controlled fuel injection system– the TX300i– and requires careful handling during routine maintenance.
What You Need
- High-quality dirt bike coolant (use factory-spec or premium pre-mix for aluminum engines)
- Basic hand tools: sockets, screwdrivers, pliers
- Catch pan and funnel
- Shop rags
- Protective gloves
- Torque wrench (optional but recommended for reassembly)
Key Notes about the TX300i
- The TX300i features side radiators with parallel coolant flow–ensure both are fully drained.
- Electronically controlled systems can be sensitive to overheating; monitor coolant quality and level regularly.
- Plastic side panels and seat need to be removed first for easy access to radiators and coolant lines.
Step-by-Step Coolant Change Instructions
- Preparation: Make sure the bike is cool before you begin to avoid injury. Place your bike on a stable stand.
- Remove the Panels & Tank: Use the appropriate tools to remove the side panels, seat, and fuel tank. This provides clear access to the radiator cap, drain bolt, and hoses – this is especially important for the TX300i due to the snug frame layout .
- Drain Old Coolant: Position your catch pan under the water pump area. Locate and carefully remove the coolant drain bolt at the engine side cover (often near the bottom of the water pump). Once loosened, coolant will begin to flow out. For a faster drain, remove the radiator cap to let air in . Ensure both radiators empty.
- Flush (Optional): If the coolant is dirty or if you are switching types (for example from glycol-based to a hybrid coolant), you can flush the system with distilled water. Pour in the water, reinstall the drain bolt, and run the bike briefly. Then repeat the drain process.
- Inspect & Clean Components: Check hoses and clamps for wear. Wipe away any debris or old coolant residue, especially near the thermostat housing and connectors.
- Refit the Drain Bolt: Reinstall and gently torque the drain bolt to manufacturer specifications (avoid over-tightening, as the case is aluminum).
- Fill with New Coolant: Using a funnel, slowly pour the new coolant into the radiator neck. Fill until the coolant reaches the base of the filler neck. If your TX300i has a bleeder port at the cylinder head, crack it open slightly to allow trapped air to escape as you fill, then retighten when coolant begins to weep out .
- Bleed the Cooling System: To purge remaining air, slightly rock the bike side-to-side. Reinstall the radiator cap. Start the engine and let it idle for a few minutes to circulate coolant. Shut off, let cool fully, and recheck/retop the level .
- Reinstall Bodywork: Once satisfied there are no leaks and the system is properly filled, reinstall your fuel tank, seat, and side panels in reverse order.
Important Reminders and 2020 TX300i-Specific Tips
- Never mix different types or colors of coolant unless manufacturer-approved.
- Monitor for coolant loss or overheating; if you notice frequent refilling is needed, inspect hoses, the radiator cap, and water pump seals.
- If your TX300i tends to run hot on technical trails, consider installing a radiator cooling fan or using a coolant formulated for extreme conditions .
- Proper coolant level is critical to avoid engine damage or power loss. Check it before every long ride.
- Disposal: Old coolant is toxic. Collect and recycle it according to local regulations.
Give your TX300i the routine attention it deserves to keep its legendary two-stroke power & performance at its best.
Related Shopping Categories
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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.