How to Change the Coolant in a 2012 Beta 350 RS SM

Shop parts for a 2012 Beta 350 RS SM Dirt Bike.

Changing the coolant in your 2012 Beta 350 RS SM is essential for maintaining engine temperature and longevity. This guide walks you through the process and highlights key points specific to your Beta model.

Why Proper Coolant Maintenance Matters

Coolant not only regulates engine temperature but also protects internal components from corrosion and cavitation. The RS SM features a high-performance engine – overheating or neglecting your cooling system increases risk to the head gasket and water pump seals.

What You Need

  • Factory-approved coolant (avoid mixing brands excessively)
  • Drain pan for old coolant
  • Socket set (for radiator drain bolt and bodywork)
  • Funnel
  • Shop towels
  • Protective gloves

Preparing Your Bike

  • Park your Beta on level ground and ensure it is cool to the touch.
  • Remove the seat and any bodywork obstructing radiator access. The RS SM chassis offers straightforward top-side access.

Draining the Old Coolant

  • Locate the drain bolt at the lowest point on the right side of the radiator (check your owner's manual for exact placement).
  • Place your drain pan beneath the bolt – Beta radiators can expel fluid quickly once opened.
  • Slowly loosen the drain bolt and allow all coolant to flow out.
  • Open the radiator cap to help the system drain faster.
  • Inspect for particle contamination or discoloration in the drained coolant, which may indicate internal wear.

Flushing (Optional but Recommended)

  • If your coolant is dirty or you're switching types, flush with distilled water.
  • If switching from water-based to non-water-based coolant, use compressed air to clear the system rather than just water for a full flush.

Refilling with New Coolant

  • Reinstall the drain bolt securely.
  • Use a funnel and slowly pour coolant into the radiator until the fluid reaches the top of the radiator fins.
  • For the 2012 Beta models, use the bleeder screw on the right radiator to purge trapped air  –  newer Betas (>2020) do not have this feature.
  • Carefully tighten the radiator cap – avoid overtightening to maintain seal integrity.

Final Steps – Bleeding the System

  • Start the bike and allow it to warm up to operating temperature. Watch for the fan to cycle and inspect for leaks.
  • Shut off the engine and let it cool completely.
  • Check coolant level in both the radiator and the expansion tank. Top off if needed.
  • Repeat heat cycles as necessary to remove any remaining air bubbles from the system – a slight drop in reservoir level may occur after first cycles.

Beta 350 RS SM Model Tips

  • This Beta includes a right-side bleeder screw for easy air removal – always utilize it for a complete bleed.
  • Inspect cooling hoses for cracking, fraying, or wear. RS SM models are known for reliable silicone hoses, but upgrade if needed for added protection.
  • Use only non-silicate, phosphate-free coolant as recommended by Beta for optimal compatibility and corrosion resistance.
  • If you notice recurring coolant loss after multiple cycles, inspect the water pump, head gasket, and hose clamps for faults.

Common Questions

  • Is mixing coolant brands allowed? Limited mixing (Motul, Liquid Moly) may be acceptable for topping off in emergencies but replace with full brand coolant at earliest convenience to avoid chemical incompatibility.
  • Is it normal to see air bubbles after changing? Some trapped bubbles can escape after the first heat cycle; monitor and top off as needed but ongoing bubbles indicate deeper system issues.

Regular coolant changes help maintain optimal engine performance and protect against costly repairs. Following these steps for your Beta 350 RS SM ensures smooth rides and long-term reliability.

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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.