How to Change the Coolant in a 2018 Beta 300 RR

Shop parts for a 2018 Beta 300 RR Dirt Bike.

Changing the coolant in your 2018 Beta 300 RR is an essential maintenance task for optimal engine performance and longevity. Following this proprietary MotoSport guide guarantees that your two-stroke stays running cool, even when tackling the hardest enduro trails or extended MotoSport rides.
What makes the 2018 Beta 300 RR unique for coolant service? This MMY model does not have bleeder screws on top of the radiator like some older Betas, affecting the way you completely refill and purge air from the system. Users performing high-level, technical riding may also be interested in thermostat bypass options or aftermarket fans to enhance cooling in extreme environments.

Supplies Needed

  • Fresh premixed coolant (consult your owner's manual for quantity and specification)
  • Drain pan
  • Basic metric hand tools (screwdrivers, sockets)
  • Clean rags
  • Safety gloves and eyewear

Step 1: Remove the Seat and Shrouds

Access to the radiator cap is easiest with the seat and side shrouds removed. Use the appropriate tools to detach the necessary fasteners and set parts aside.

Step 2: Drain the Old Coolant

  • Place your drain pan beneath the lower water pump area or engine case, where the coolant drain bolt (usually 8mm) is located.
  • With the engine cold, remove the radiator cap to break the vacuum and allow coolant to flow freely.
  • Remove the drain bolt and let all coolant drain out. Tilting the bike gently side-to-side can help evacuate trapped coolant, as the 2018 Beta 300 RR lacks a radiator bleeder screw.
  • Inspect old coolant for debris, oil, or discoloration, which signals a potential need for mechanical inspection.

Step 3: Reinstall the Drain Bolt

Wipe any residue from the drain area, check the copper washer (replace if damaged), and reinstall the drain bolt to manufacturer torque specs.

Step 4: Fill with New Coolant

  • Slowly add the specified amount of premixed, compatible coolant into the radiator neck. Allow time for fluid to settle and air to escape into the system.
  • Since there is no bleeder screw, rocking the bike gently side-to-side and front-to-back during this process helps eliminate trapped pockets of air.
  • Fill until the coolant level is visible just above the radiator core fins, but not overflowing.

Step 5: Purge Air from the System

  • With the radiator cap off, briefly start the engine (10-20 seconds maximum) to move any residual air through the system. Watch coolant level and top off as needed.
  • Reinstall the radiator cap once the system is filled and stabilized. Check around all hoses, drains, and caps for leaks.

Step 6: Post-Change Checklist

  • After several minutes of engine operation and a short, low-speed test ride, let the bike cool and recheck the coolant level. Top off if necessary.
  • Inspect radiator fins for damage or clogging, and ensure the overflow hose is intact and correctly routed for quick overflow alerts if overheating occurs.
  • Consider periodic upgrades such as a thermostat bypass or auxiliary fan kit if you frequently ride technical slow-speed terrain where heat can build. The 2018 Beta 300 RR's system is robust but benefits from these modifications in tough conditions.

Additional Notes for 2018 Beta 300 RR Owners

  • No radiator bleeder screw: Carefully rocking the bike while filling is the best way to eliminate air pockets.
  • Coolant capacity: Always verify with your owner's manual. If you switch coolants, thoroughly flush the system to avoid chemical incompatibility.
  • Thermostat and airflow: Owners sometimes bypass the thermostat for increased coolant flow, but be aware this mod impacts warm-up times and engine efficiency. Evaluate your performance needs before making permanent modifications.

Regular coolant changes extend engine life and maintain power output – especially when you're pushing your Beta 300 RR to its limits. For all your maintenance needs and upgrade options, Shop parts for a 2018 Beta 300 RR Dirt Bike.

Related Shopping Categories

Shop Radiators for a 2018 Beta 300 RR Dirt Bike.

Shop Coolant for a 2018 Beta 300 RR Dirt Bike.

Shop Temperature Sensors for a 2018 Beta 300 RR Dirt Bike.

Shop Tools for a 2018 Beta 300 RR Dirt Bike.

Shop Radiator Hoses for a 2018 Beta 300 RR 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.