How to Change the Coolant in a 1995 Honda CR125
Shop parts for a 1995 Honda CR125 Dirt Bike.
Keeping the cooling system in your 1995 Honda CR125 in top condition is crucial for both performance and longevity. This guide covers the complete process to change the coolant, with notes specific to this legendary two-stroke model. Proper maintenance can help you tear up the track or trails without fear of overheating or engine damage.
Why Change Your Coolant?
Coolant prevents overheating, corrosion, and freeze-ups by circulating through your engine and radiators. Over time, it breaks down and accumulates debris, which can impact your bike’s performance. Honda recommends replacing coolant every two years or after intensive riding sessions.
What You’ll Need
- Fresh coolant approved for aluminum engines
- Distilled water (if you want to flush, not just drain and refill)
- Drain pan (at least 2-quart capacity)
- 8mm, 10mm, and 12mm socket or box wrenches
- Screwdrivers
- Shop rags
- New hose clamps or radiator cap if needed
- Rubber gloves and eye protection
CR125 Model Notes
- The 1995 CR125 features a lightweight aluminum radiator – avoid overtightening fasteners when reinstalling to prevent damaging the soft metal.
- This bike uses a simple gravity-fed cooling system; air pockets are a common cause of overheating after service. Burp the system thoroughly before riding.
- Check hoses carefully: original 1995 hoses are prone to cracking and should be inspected or replaced during coolant changes.
Step-by-Step Coolant Change Process
- Ensure the bike is cool—never work on a hot engine. Place the bike upright on a stand for stability.
- Remove the radiator cap slowly to release system pressure. Do this only when the engine is cold to avoid injury from hot fluid.
- Locate the drain bolt on the lower water pump cover (right side of the engine, usually 8mm bolt at the bottom).
- Position a drain pan under the water pump and remove the drain bolt. Let the coolant drain completely.
- For a more thorough flush, disconnect the lower radiator hose and let any remaining coolant drain out. If desired, pour distilled water into the radiator, reinstall the drain bolt, and run the engine briefly (cap off) to circulate the water. Drain again.
- Inspect the drained coolant for oil or metallic debris—this could indicate a larger problem such as a bad water pump seal.
- Reinstall the drain bolt with a fresh crush washer to prevent leaks. Tighten securely but do not over-torque.
- Fill the radiator slowly with fresh coolant, stopping periodically to tap the radiator and hoses to release air bubbles. Fill to the very top of the filler neck.
- Start the engine and let it idle for several minutes with the radiator cap off, allowing trapped air to escape. Add coolant as the level drops.
- Check for leaks at the drain bolt and hoses. When no more bubbles appear and the coolant level stabilizes, replace the radiator cap.
- After a short test ride, let the bike cool, then recheck the coolant level and top off if necessary.
Extra Tips for 1995 Honda CR125 Owners
- Never use water alone for coolant—use a mix designed for aluminum engines to guard against corrosion.
- Distilled water mixed with coolant is best—tap water can leave mineral deposits inside the system.
- Check the radiator cap: a weak spring can cause the system to boil over early, leading to power loss on the track.
Stay ahead of cooling issues with regular maintenance and parts upgrades. The CR125 is a true classic—give it the attention it deserves to keep it running strong ride after ride.
Related Shopping Categories
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Shop Tools for a 1995 Honda CR125 Dirt Bike.
Shop Radiator Hoses for a 1995 Honda CR125 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.