How to Change the Coolant in a 2020 Sherco 450 SEF-R: Step-by-Step Guide

Shop parts for a 2020 Sherco 450 SEF-R Dirt Bike.

Maintaining optimal engine temperature is vital for performance and the longevity of your 2020 Sherco 450 SEF-R. Regular coolant changes prevent overheating, corrosion, and component wear—and this process is straightforward if you follow the right steps. Below you’ll find a model-specific, comprehensive guide designed for MotoSport riders.

What Makes the 2020 Sherco 450 SEF-R Unique?

  • High-performance 4-stroke engine with advanced cooling circuits
  • Uses closed aluminum radiators and low-mount water pump to optimize cooling
  • Check for any leaks at the water pump weep hole or radiator joints, as noted in regular maintenance intervals

Note: Always use a recommended ethylene glycol-based coolant rated for at least –25°C to protect against freezing and corrosion. Do not substitute with water or generic coolants, as this can damage alloy parts and result in overheating.

Tools & Supplies Needed

  • New coolant (at least 1.1 liters, ethylene glycol-based)
  • Drain pan
  • Ratchet and socket set
  • Flathead screwdriver
  • Torque wrench (for drain/bleed screws)
  • Shop towels
  • Gloves and safety glasses

Step-by-Step Coolant Change Procedure

  1. Preparation:
    • Let the engine cool completely to prevent burns.
    • Stand the bike upright on a level surface.
    • Remove the seat and fuel tank (if necessary for radiator access).
  2. Drain the Old Coolant:
    • Place a drain pan under the water pump area.
    • Locate the coolant drain bolt, usually at the lower part of the water pump housing.
    • Use the correct socket to loosen and remove the drain bolt.
    • Remove the radiator cap to help the coolant flow out completely.
    • Allow all the coolant to drain fully.
    • Tip: Inspect drained coolant for contaminants or oil, which might indicate internal issues.
  3. Replace the Drain Bolt:
    • Wipe down the area and inspect the O-ring or gasket; replace if worn.
    • Reinstall the drain bolt and torque it to 6 Nm.
  4. Refill the System:
    • Remove the radiator cap and the bleed screw (usually on the left radiator upper tank).
    • Slowly pour coolant into the radiator until it flows from the bleed screw without bubbles.
    • Install the bleed screw with a new crush washer if required; torque to manufacturer specification (typically 8 Nm for M6 screws).
    • Continue filling until the coolant reaches the correct level as marked on the overflow reservoir or radiator neck.
  5. Bleed the System:
    • Rock the bike gently and squeeze radiator hoses to help dislodge trapped air.
    • Top off coolant as necessary.
  6. Reassembly & Inspection:
    • Reinstall any removed parts: tank, seat, etc.
    • Clean up spilled coolant and dispose of old coolant properly—never pour down the drain.
  7. Warm Up & Final Check:
    • Start the bike, let it idle with the radiator cap off to observe for air bubbles.
    • Top off as needed, then install the cap securely.
    • Check all hoses and the area around the water pump and radiator for leaks.

Important Model-Specific Reminders

  • Torque all bolts to specifications (drain plug: 6 Nm, radiator bleed screw: 8 Nm).
  • Avoid mixing coolant brands or types, as this can reduce effectiveness or damage the cooling system.
  • The 450 SEF-R’s water pump design is robust, but monitors for leaks at the weep hole—which may indicate a failing seal that should be replaced promptly to avoid engine damage.

When to Change Coolant

  • At least once per season or after long, hard rides in hot conditions
  • If the fluid looks cloudy, rusty, or off-color
  • Before or after winterization

Proper coolant management keeps your Sherco 450 SEF-R running cool under pressure. For top-quality parts, maintenance tools, or specific radiators and seals, Shop parts for a 2020 Sherco 450 SEF-R Dirt Bike.

Related Shopping Categories

Shop Radiators for a 2020 Sherco 450 SEF-R Dirt Bike.

Shop Coolant for a 2020 Sherco 450 SEF-R Dirt Bike.

Shop Temperature Sensors for a 2020 Sherco 450 SEF-R Dirt Bike.

Shop Tools for a 2020 Sherco 450 SEF-R Dirt Bike.

Shop Radiator Hoses for a 2020 Sherco 450 SEF-R 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.