How to Change the Coolant in a 2014 Beta 400 RS SM
Shop parts for a 2014 Beta 400 RS SM Dirt Bike.
Regular coolant maintenance is essential for keeping your 2014 Beta 400 RS SM running at peak performance and avoiding overheating in harsh off-road conditions. Changing the coolant is a hands-on job, but with the right guidance and some simple tools, you can ensure your machine runs cool – even on the toughest trail rides. Here is MotoSport's step-by-step guide tailored specifically to your Beta dirt bike, along with some model-specific tips to make your service go smoothly.
What You Need
- Quality motorcycle coolant (use 40 percent antifreeze, 60 percent distilled water for optimal performance; coolant capacity for the 400 RS SM is approximately 1.3 liters)
- Drain pan
- Basic wrenches/screwdrivers
- Rags and gloves
Step-by-Step Coolant Change
- Ensure the engine is completely cool. Never try to open the radiator cap while the engine is hot – pressure will release and can cause burns.
- Locate the radiator cap on the right radiator. For the 2014 model, there is also a bleeder screw on top of the right radiator to help evacuate air from the system – a feature not found on later models.
- Remove the radiator cap and position your drain pan under the bike.
- Find and remove the coolant drain bolt (typically at the lowest point of the water pump housing on the right side of the engine). Allow the coolant to fully drain into the pan. For a more thorough flush, reconnect the bolt, fill the system with distilled water, and repeat the draining process.
- Optionally flush the system with a 50/50 mix of vinegar and distilled water for neglected or unknown-service bikes. Run the engine briefly until warm, let cool, drain again, then flush once more with pure distilled water.
- Reinstall the drain bolt, ensuring the copper washer is in good condition and torqued properly.
- Slowly pour fresh coolant into the radiator filler neck. The Beta 400 RS SM requires 1.3 liters; fill until coolant covers the radiator fins. Pouring slowly reduces air bubbles. Pause as needed to allow coolant to settle and fill the system.
- Squeeze radiator hoses and gently rock the bike from side to side. This helps move trapped air to the top of the system for release.
- If present, loosen the bleeder screw on the right radiator to allow trapped air to escape, then retighten once coolant begins to seep out.
- With the radiator cap off, start the engine and let it idle for a minute or two. A few quick throttle blips can further shake out air pockets. Shut off the engine and top up the coolant if necessary.
- Install the radiator cap securely. Clean up any spills or drips.
- Check coolant level in the overflow reservoir and fill to the designated line.
After-Service Checks
- After the first heat cycle, let the bike cool and check coolant levels again in both the radiator and reservoir. Top off if needed, as air may continue to burp out during the first ride or two.
- Inspect for leaks at the drain bolt, radiator hoses, and cap.
Model-Specific Tips for the 2014 Beta 400 RS SM
- This year/model uses a radiator system with a dedicated bleeder screw on the right radiator – always use this to help purge trapped air for more effective cooling.
- Beta recommends 40 percent antifreeze and 60 percent distilled water for reliable antifreeze protection and optimal cooling. Capacity is 1.3 liters.
- Unlike later Beta models, this 2014 version may require extra attention when burping air from the system – take your time to avoid overheating issues down the road.
- Routine coolant service is especially critical for off-road applications, as mud, sand, and debris accelerate corrosion and clog fins more quickly. Plan to change coolant once per year or sooner if riding in harsh conditions.
- Inspect radiator fins and cap for signs of damage—fixing any issues early can prevent major problems on the trail.
Keep your 2014 Beta 400 RS SM running cool and reliable by following this MotoSport-exclusive maintenance guide. Your ride deserves the best—treat it right for endless adventures.
Related Shopping Categories
Shop Radiators for a 2014 Beta 400 RS SM Dirt Bike.
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Shop Temperature Sensors for a 2014 Beta 400 RS SM Dirt Bike.
Shop Tools for a 2014 Beta 400 RS SM Dirt Bike.
Shop Radiator Hoses for a 2014 Beta 400 RS SM 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.
