How to Change the Coolant in a 2019 Suzuki RMZ250

Shop parts for a 2019 Suzuki RMZ250 Dirt Bike.

Maintaining your 2019 Suzuki RMZ250 means keeping the cooling system in top shape. Regular coolant changes keep your engine running at optimal temperature, helping prevent overheating – crucial for the RMZ250's high-revving powerplant. Here's the proprietary MotoSport guide to changing the coolant safely and thoroughly.

Preparation – What You'll Need

  • Correct engine coolant (consult your owner's manual for specifications)
  • Socket wrench set
  • Replacement gasket washer (for the drain bolt)
  • Final torque spec: 11 N·m (8.0 lbf-ft)
  • A clean rag for spills
  • Catch pan
  • Protective gloves – coolant can be harmful to skin and eyes

Step 1: Let the Bike Cool Down

Never open the radiator cap when the engine is hot. Wait until the bike is completely cool to avoid burns from hot liquid or vapor.

Step 2: Remove the Radiator Cap

Open the radiator cap to relieve internal pressure and allow coolant to drain freely.
Pro tip: Inspect the cap for damage or wear – a tight seal is essential for proper cooling.

Step 3: Drain the Old Coolant

  • Locate the coolant drain bolt (typically near the water pump or lower engine case).
  • Place your catch pan underneath and remove the drain bolt.
  • Allow all coolant to flow out – this usually takes a few minutes.
  • Replace the gasket washer (old washers may leak when reused).
  • Reinstall the drain bolt and tighten to 11 N·m (8.0 lbf-ft).

Step 4: Bleed Air from the System

The RMZ250 includes an air bleeder bolt at the top of the radiator. Loosen this bolt slightly while refilling the system to help trapped air escape – air pockets significantly reduce cooling efficiency.

Step 5: Add New Coolant

  • Pour the specified engine coolant into the radiator until it reaches the bottom of the filler neck. The RMZ250's coolant capacity is 950 ml (1.0 US qt).
  • Once full and coolant flows cleanly from the bleeder, tighten the air bleeder bolt.

Step 6: Finishing Up

  • Double-check all bolts for correct tightness.
  • Clean any spilled coolant – it's slippery and can damage paint.
  • Run the engine briefly, then let it cool and recheck the coolant level. Top up if needed.
  • Properly dispose of old coolant – never pour it down drains or into the environment.

2019 RMZ250 Notes

  • The RMZ250 utilizes a high-performance, lightweight aluminum cooling system; regular flushing keeps passages clear and maximizes heat transfer.
  • Never substitute automotive coolant – always use dirt bike-specific coolant to avoid internal corrosion and ensure optimal water pump life.
  • If switching coolant types (from water-based to non-water-based), flush thoroughly and consider using compressed air to clear all residue before refilling.

Safety & Environmental Tips

  • Coolant is toxic – avoid skin/eye contact and clean spills promptly.
  • If coolant is swallowed, seek medical attention immediately.
  • Protect local wildlife and waterways by disposing of old coolant responsibly.

MotoSport is passionate about keeping your Suzuki RMZ250 at peak performance. Regular coolant replacement is simple preventative maintenance that protects your motor and maximizes your time on the track. For genuine parts, tools, and everything to support your ride, trust MotoSport to keep you ready for the next race.

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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.