How to Change the Coolant in a 1996 Suzuki RM125

Shop parts for a 1996 Suzuki RM125 Dirt Bike.

Changing the coolant on your 1996 Suzuki RM125 is vital for maintaining optimal engine temperature and performance, whether you race or trail ride. Regular coolant service ensures your bike doesn't overheat and your cooling system components last as long as possible. Here's a MotoSport-exclusive step-by-step process suited just for your RM125 owners:

Tools & Supplies Needed

  • Fresh coolant appropriate for motorcycles (silicate-free, aluminum-safe)
  • Distilled water (for flushing)
  • 8mm and 10mm sockets or wrenches (double-check sizes based on your hardware)
  • Drain pan
  • Shop towels
  • Safety gloves and eye protection

Step-by-Step Coolant Change Guide

  1. Let the engine cool–Never attempt to open your radiator cap when the engine is hot. Allow the bike to cool for at least 30 minutes.
  2. Remove the radiator shrouds–Use your socket set to take off the side plastic shrouds for easier radiator access.
  3. Position your drain pan–Place it beneath the water pump area on the bike's right side. This is where your drain bolt is located.
  4. Remove the radiator cap–Locate the radiator cap on top of the left side radiator and take it off to relieve any pressure and allow for full drainage.
  5. Loosen the coolant drain bolt–Find the 10mm drain bolt on the water pump cover (right low side of the engine). Remove it and allow coolant to fully drain into the pan. Be sure to properly dispose of old coolant—never pour it down a drain or on the ground.
  6. Flush the system (recommended)–Pour distilled water through the open radiator neck until it drains clear from the pump. This helps remove old coolant and debris. Replace the drain bolt securely afterwards.
  7. Add new coolant–Slowly pour fresh coolant into the radiator until it's filled to the bottom of the neck. Squeeze the radiator hoses gently to help release trapped air. Top off as necessary.
  8. Replace the radiator cap–Once filled, reinstall the cap securely.
  9. Reinstall the shrouds–Bolt the plastics back into place.
  10. Run and recheck–Start the bike and let it idle for a few minutes. Shut it off and let it cool again. Recheck the coolant level at the radiator. Top off if needed.

MotoSport Model-Specific Tips: 1996 RM125 Owners

  • Your 1996 RM125 uses a twin-radiator, closed-loop cooling system and has a relatively small fluid capacity, so never overfill.
  • Inspect your radiator hoses for cracks or brittleness. Replace any suspect hoses to avoid leaks during racing or trail rides.
  • The aluminum radiators on this model are somewhat prone to damage from tip-overs or roost impacts. Check for bent fins that could limit cooling efficiency.
  • If switching coolant types (such as from standard ethylene glycol to a racing coolant), always flush thoroughly with distilled water to prevent chemical reactions inside the engine.
  • The RM125's water pump can wear over time, particularly the seal–if you see milky residue or notice coolant loss, investigate further.

Coolant Change Frequency

For your RM125, replace coolant at least once a year, or more often if you ride and race hard in summer conditions. Routine maintenance helps prevent overheating and ensures maximum power output on the track or trail.

Related Shopping Categories

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Shop Radiator Hoses for a 1996 Suzuki RM125 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.