How to Change the Coolant in a 2019 Suzuki RMX450Z
Shop parts for a 2019 Suzuki RMX450Z Dirt Bike.
Maintaining your 2019 Suzuki RMX450Z is essential for performance and longevity, and regular coolant changes are a key part of that process. Below you'll find a proprietary MotoSport guide crafted specifically for this popular enduro model, ensuring you get the most accurate, RMX450Z-focused instructions for changing your coolant.
What to Know Before You Begin
- Engine coolant capacity: 950 ml (1.0 US quart)
- Always use a coolant compatible with aluminum radiators
- Inspect coolant for sediment or discoloration–these indicate it's time to flush the system, not just replace fluid
- Allow the motorcycle to cool fully before beginning—hot coolant can cause serious burns
- Have a new drain bolt gasket or washer on hand for a proper seal
- The RMX450Z's cooling system is very similar to the RM-Z450, but be attentive to off-road usage and check for dirt or debris in radiator fins while the system is empty
Tools & Supplies Needed
- Socket set (with 12 mm socket for drain bolt)
- Phillips & flathead screwdrivers
- Drain pan (minimum 1 liter capacity)
- Fresh coolant (preferably pre-mixed, 50/50 for aluminum radiators)
- Clean rags
- New drain bolt gasket/washer
Step-by-Step Coolant Change Procedure
- Allow the engine to cool completely. This is critical for safe removal of the radiator cap.
- Remove the radiator cap. Carefully twist it off–pressure may still be present even when cool.
- Locate the coolant drain bolt. On the RMX450Z, the coolant drain bolt is typically found on the lower portion of the right side of the water pump. Place the drain pan underneath.
- Remove the drain bolt and its gasket. Let the coolant drain completely. Inspect the old gasket; replace with a new one during reinstallation.
- Flush the system if desired. For a full flush: briefly reinstall the bolt/gasket, fill system with distilled water, start engine for 1-2 minutes, then repeat the drain procedure. This removes old contaminants.
- Reinstall the drain bolt and tighten securely. Do not overtighten to avoid stripping threads.
- Fill the radiator with fresh coolant up to the base of the filler neck. Pour slowly to prevent trapping air.
- Bleed the cooling system. Briefly loosen the air bleeder bolt (often located near the top of the cylinder head or water neck) until coolant flows steadily, then retighten.
- Reinstall the radiator cap securely. Start the engine and allow it to idle for several minutes to open the thermostat and circulate coolant.
- Shut off the engine and let it cool completely. Recheck coolant level and top up as needed. Also check for leaks at both the drain bolt and at all hose clamps.
Noteworthy for the RMX450Z Owner
- The 2019 RMX450Z features a robust cooling system for off-road endurance, but excess mud and debris are common due to enduro use. Clean radiator fins with compressed air after draining coolant, before refilling.
- This bike's system capacity is slightly larger than some MX variants–always measure drained amount as a reference and avoid overfilling.
- If you notice coolant loss after the first warm-up cycle, check the overflow tank once the bike has cooled. Air sometimes purges after the first run, requiring a top-off.
Quick Tips
- Proper disposal: Always collect used coolant and dispose of it responsibly at a local waste facility.
- Check for soft hoses, split clamps, or seeping gaskets, as these often lead to pressure loss under heavy riding conditions unique to the RMX450Z.
Related Shopping Categories
Shop Radiators for a 2019 Suzuki RMX450Z Dirt Bike.
Shop Coolant for a 2019 Suzuki RMX450Z Dirt Bike.
Shop Temperature Sensors for a 2019 Suzuki RMX450Z Dirt Bike.
Shop Tools for a 2019 Suzuki RMX450Z Dirt Bike.
Shop Radiator Hoses for a 2019 Suzuki RMX450Z 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.