How to Change the Coolant in a 2019 Sherco 500 SEF-R: Step-by-Step Guide

Shop parts for a 2019 Sherco 500 SEF-R Dirt Bike.

Routine coolant changes are essential for the health and longevity of your 2019 Sherco 500 SEF-R. Properly servicing the cooling system ensures your bike operates at peak performance and protects the advanced Synerject electronic fuel-injection system unique to this model. Below is a step-by-step guide designed for Sherco 500 SEF-R owners to safely and effectively change their coolant.

What You Need

  • Fresh, high-quality motorcycle coolant compatible with aluminum components
  • Drain pan
  • 8 mm & 10 mm sockets (for radiator shrouds and drain plug)
  • Flathead screwdriver (for radiator cap)
  • Clean funnel
  • Protective gloves and eyewear
  • Distilled water (if flushing the system)

Step 1: Preparation

  • Allow the engine to cool completely before beginning—hot coolant is under pressure and can cause severe burns.
  • Place your Sherco 500 SEF-R securely on a level surface using a stand.
  • Remove bodywork or shrouds as necessary to access the radiator cap and drain bolt.

Step 2: Draining the Old Coolant

  • Locate the radiator cap on the left radiator.
  • Slowly loosen and remove the cap to release residual pressure.
  • Position a drain pan beneath the water pump cover. Locate the coolant drain bolt on the bottom of the water pump housing and remove it using the correct socket. Allow coolant to fully drain from the system.
  • If performing a flush, temporarily reinstall the drain bolt, fill the system with distilled water, run the engine briefly, then repeat the draining process.

Step 3: Refilling with New Coolant

  • Reinstall the drain bolt, tightening to factory specification (refer to your service manual for torque spec).
  • Using a clean funnel, pour fresh coolant slowly into the radiator until it reaches the bottom of the filler neck. On the 500 SEF-R, avoid overfilling as extra coolant will be expelled by the expansion tank when hot.

Step 4: Bleeding Air from the System

  • Gently rock the bike side to side and tap the hoses to help dislodge trapped air bubbles.
  • Start the engine and let it idle with the radiator cap off. As air escapes, the coolant level may drop—top off as needed.
  • Once the engine is warm and the thermostat has opened (the radiator will feel hot), replace the radiator cap.

Step 5: Final Checks

  • Let the bike cool completely to ambient temperature.
  • Recheck and top off coolant in both radiator and reservoir if necessary. The reservoir acts as the expansion tank—a drop in level after the first heat cycle is normal.
  • Reinstall any removed bodywork or shrouds.

Key Considerations for the 2019 Sherco 500 SEF-R

  • Synerject EFI System: This bike's electronic fuel injection relies on consistent engine temperature for optimal mapping. Using the correct coolant and maintaining proper levels is critical.
  • Coolant Spec: Use only coolants compatible with aluminum radiators and pump components. Avoid automotive coolants containing silicates unless specified as motorcycle-safe.
  • Torque Specs: Always consult your owner's manual for drain plug and component torque values to prevent damage.
  • Inspect for Leaks: After the first ride, closely check for leaks or air pockets, especially around hose connections and the water pump area.

When to Replace Coolant

  • Change coolant annually or every 2 years at minimum—whichever comes first, or if fluid appears rusty or contaminated.
  • After extreme riding or overheating incidents, check and replace as needed.

Keeping your 2019 Sherco 500 SEF-R's cooling system serviced is a fast, cost-effective way to ensure maximum performance wherever you ride. For all OEM and upgrade parts for your exact model, MotoSport has you covered—give your Sherco the best so your ride is always ready for the next challenge.

Related Shopping Categories

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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.