How to Change the Coolant in a 2021 Beta 300 RR Race
Shop parts for a 2021 Beta 300 RR Race Dirt Bike.
Changing the coolant on your 2021 Beta 300 RR Race is an essential part of routine maintenance, helping to ensure performance and longevity in all riding conditions. The Beta 300 RR Race features a forced liquid cooling system with a straightforward design, but there are a few model-specific details every owner should know. This guide will walk you through the process, highlight unique considerations, and help you keep your machine running at its best.
What You'll Need
- New coolant (use motorcycle-specific, pre-mixed coolant or mix distilled water with approved antifreeze)
- Basic hand tools (wrenches or socket set)
- Drain pan
- Funnel and rags
- Safety gloves and glasses
Step 1 – Prepare Your 2021 Beta 300 RR Race
Place the bike on a stable stand and ensure the engine is completely cool. Cooling systems are pressurized when hot, which can cause burns if the radiator cap is removed too soon.
Step 2 – Remove the Radiator Cap
Locate the radiator cap, which is on the right side of the bike. Unscrew the cap slowly to release any potential pressure in the system. Make sure the fluid is cold before proceeding1.
Step 3 – Drain the Old Coolant
Place a drain pan beneath the engine. The 2021 Beta 300 RR Race does not have a dedicated radiator drain plug—instead, coolant is usually drained by loosening (or removing) the lower radiator hose on the right side at the base of the radiator. Allow all coolant to flow out.
Some owners gently "rock" the bike side-to-side to help transfer remaining coolant from each radiator, ensuring system is empty1.
Step 4 – Inspect and Reassemble
Before reassembly, inspect hoses and radiator for leaks, cracks, or damage. If everything is in order, reattach the lower hose and tighten clamps securely.
Step 5 – Add New Coolant
Slowly fill the radiator with fresh coolant until the fluid just covers the tops of the radiator cores or sits slightly above the internal fins. The 2021 Beta 300 RR Race does not include a bleeder screw like older Betas—on this model, air is purged by rocking the bike and carefully topping off the radiator as bubbles escape1.
Do not fill to the very top; leave some space for expansion when the engine heats up.
Step 6 – Bleed the Cooling System
Gently rock the motorcycle from side-to-side and front-to-back a few times to help any trapped air move to the top. As trapped air evacuates, the coolant level may drop—top up as needed.
Once the system appears free of bubbles and coolant covers the internal cores, replace and tighten the radiator cap.
Step 7 – Check for Leaks and Final Top-Off
Start the engine and let it idle for several minutes. Watch for leaks and monitor coolant level as the thermostat opens and coolant circulates.
If the coolant level drops after the engine warms up, carefully remove the cap once the engine is cold again and top off as needed.
Model-Specific Owner Notes
- No Bleeder Screw– Unlike older Beta models, the 2021 Beta 300 RR Race relies on rocking the bike to purge air from the cooling system1.
- Cooling System Volume– Expect to use just over one liter of coolant; avoid overfilling2.
- Preventative Maintenance– Change the coolant yearly, or after any severe overheating or system contamination.
- Inspect for Burrs– Owners of this generation have occasionally found sharp burrs on the edges of coolant ports during disassembly, which can be gently removed with a fine file if discovered during deeper maintenance3.
- Engine Protection– Always use the recommended coolant for aluminum engines to prevent corrosion and guarantee cooling efficiency.
Wrapping Up
With basic hand tools and a little care, changing the coolant on your 2021 Beta 300 RR Race is straightforward. Regular coolant changes are a great way to protect your investment, while special attention to this model's no-bleeder design ensures reliable, bubble-free performance on every ride.
Related Shopping Categories
Shop Radiators for a 2021 Beta 300 RR Race Dirt Bike.
Shop Coolant for a 2021 Beta 300 RR Race Dirt Bike.
Shop Temperature Sensors for a 2021 Beta 300 RR Race Dirt Bike.
Shop Tools for a 2021 Beta 300 RR Race Dirt Bike.
Shop Radiator Hoses for a 2021 Beta 300 RR Race 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.