How to Change the Coolant in a 2001 Suzuki RM125
Shop parts for a 2001 Suzuki RM125 Dirt Bike.
Maintaining your 2001 Suzuki RM125 cooling system is essential for engine longevity – whether you ride tracks or trails, fresh coolant ensures optimal performance and protection from overheating. Below is a proprietary MotoSport guide outlining the correct procedure to swap coolant in your RM125, along with model-specific insights to keep your bike running cool all season.
What You Need
- Metric socket or wrench set (8mm – 10mm sizes recommended)
- Catch pan for old coolant
- New coolant compatible with motocross bikes*
- Distilled water for flushing (if desired)
- Gloves & shop towels
*Tip: Never mix coolant types. The RM125 functions best with a high-performance, silicate-free coolant formulated for aluminum radiator systems.
Step-by-Step Coolant Change
- Ensure the engine is completely cool. Never open the radiator cap or drain system when hot to prevent burns.
- Remove radiator shrouds for easy access using an 8mm socket or wrench. Unbolt three fasteners per shroud and set aside.
- Locate the radiator cap at the top of the left radiator – remove it to relieve any internal pressure.
- Find the coolant drain bolt on the water pump (bottom right side of the engine cover). Use a 10mm socket to remove this bolt and allow coolant to drain completely into your catch pan.
- Once the flow slows, lean the bike slightly side to side to fully evacuate the coolant.
- If you are flushing the system, pour distilled water into the radiator filler neck (cap still off). Let it pass through and drain out the open water pump bolt. Repeat until the water runs clear.
- Reinstall the drain bolt securely. Do not overtighten – a firm fit stops leaks.
- Fill the radiator with fresh coolant to just below the filler neck. Gently rock the bike or squeeze hoses to help purge air from the system.
- Replace the radiator cap securely.
- Reinstall shrouds.
- Start the engine and let it run briefly. Shut it off and allow it to cool again. Re-check the coolant level and top off if necessary.
What RM125 Owners Should Know
- The 2001 Suzuki RM125 uses a simple, high-capacity dual-radiator setup – excellent for cooling but sensitive to air pockets. Always "burp" the system by running the engine with the radiator cap off after filling (carefully, while cold) to release trapped air.
- If riding aggressively or in warm climates, check coolant level before every ride – these bikes have a small system volume and are prone to boil-over if underfilled or if the radiators are clogged.
- Inspect radiator fins for damage during coolant changes, and keep the exterior clean for maximum airflow.
- If your bike overheats or coolant looks discolored after a ride, inspect water pump seals and radiator hoses for leaks or wear.
Disposal and Safety Reminders
- Collect used coolant in a sealed container and dispose at your local hazardous waste facility – never pour it down drains or onto the ground.
- Always use gloves and wash hands after handling coolant.
Regularly changing the coolant in your RM125 ensures the legendary performance and reliability this two-stroke is known for. MotoSport.com keeps you covered for all your cooling system parts and maintenance needs.
Related Shopping Categories
Shop Radiators for a 2001 Suzuki RM125 Dirt Bike.
Shop Coolant for a 2001 Suzuki RM125 Dirt Bike.
Shop Temperature Sensors for a 2001 Suzuki RM125 Dirt Bike.
Shop Tools for a 2001 Suzuki RM125 Dirt Bike.
Shop Radiator Hoses for a 2001 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.