How to Change the Coolant in a 2009 Beta 450 RS SM: Step-By-Step Guide

Shop parts for a 2009 Beta 450 RS SM Dirt Bike.

Keeping the cooling system fresh in your 2009 Beta 450 RS SM is critical for optimal engine temperature, longevity, and reliability. Follow this definitive MotoSport-exclusive procedure to DIY your coolant swap safely and effectively.

Tools & Supplies You'll Need

  • Quality premixed motorcycle coolant (silicate-free, non-glycol blends are often recommended)
  • Clean drain pan
  • Socket wrench set (typically a 10mm socket or similar for the drain bolt on Beta models)
  • Flathead screwdriver (for hose clamps or radiator cap, if required)
  • Funnel
  • Clean rags
  • Protective gloves and eyewear

Step 1: Prep Your Bike

  • Ensure engine is completely cold before starting – never open a hot cooling system.
  • Stabilize your Beta on a level surface or stand. Remove the skid plate if necessary, to access the drain plug.

Step 2: Access the Cooling System

  • Locate the radiator cap (usually left radiator, top corner).
  • Find the coolant drain bolt. On most Beta engines, this is on the lower right side of the engine case.

Step 3: Drain Old Coolant

  • Position the drain pan under the drain bolt.
  • Carefully loosen or remove the radiator cap first – this breaks suction and helps coolant drain more efficiently.
  • Remove the coolant drain bolt. Allow coolant to fully empty into the drain pan. If your bike has a coolant reservoir, remove the cap and drain hose to empty as well.

Step 4: Flush (Optional, for Thorough Maintenance)

  • If switching coolant types, flush with distilled water. Fill, run the engine briefly, and drain.
  • For best results, blow out any remaining liquid with compressed air through the system (be gentle to avoid damaging seals).

Step 5: Reinstall Components

  • Reinstall and tighten the coolant drain bolt (typically 12-14 Nm is sufficient, but consult the Beta service manual for torque specs if unsure).
  • Double-check O-rings/seals for any signs of wear or degradation.

Step 6: Add New Coolant

  • Slowly pour new coolant through the radiator fill neck using a funnel. Fill until coolant is visible at the base of the filler neck.
  • If your Beta has a coolant reservoir, fill to the recommended line.

Step 7: Bleed Air From the System

  • With the radiator cap off, start the engine and let it idle. Carefully rock the bike side to side to help dislodge trapped air.
  • As engine warms, air bubbles may emerge. Continue to top up until level stays steady.
  • Once warmed fully and no more bubbles appear, shut off the engine and let it cool completely.
  • Recheck the coolant level in both the radiator and reservoir after cooling. Top off if necessary.

Step 8: Reinstall Radiator Cap & Test

  • Install the cap securely.
  • Clean any spilled coolant and reinstall the skid plate.
  • Go for a brief test ride, then check levels again once the engine cools.

Notes Specific to the 2009 Beta 450 RS SM

  • Factory coolant capacity is about 1.3 liters. Do not overfill; leave room for expansion.
  • Use OE-spec coolant for aluminum radiators & magnesium cases. Avoid green automotive coolant unless it is silicate-free.
  • This model features a simple two-radiator system – no thermostat, so warming up fully after filling is important for bleeding any air out.
  • Check hoses and radiator for leaks; the 450 RS SM has robust but exposed cooling lines that can be vulnerable in off-road use.
  • If you detect repeat air loss or low coolant, inspect the water pump seals and head gasket – issues here are rare but critical to catch early.

Following these instructions will help keep your 2009 Beta 450 RS SM running cool, protected, and ready for adventure. MotoSport has all the parts and accessories you need to maintain your Beta to factory standards.

Related Shopping Categories

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Shop Radiator Hoses for a 2009 Beta 450 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.