How to Change the Coolant in a 2022 Sherco 300SEF-R: A Complete Owner's Guide

Shop parts for a 2022 Sherco 300SEF-R Dirt Bike.

Getting the most from your 2022 Sherco 300SEF-R means keeping its cooling system in top shape. A regular coolant change ensures optimal performance, protects vital engine components, and preserves riding fun – even on the most demanding trails. Here’s a step-by-step guide crafted specifically for MotoSport customers and Sherco owners.

What Makes the 300SEF-R Cooling System Unique?

Sherco’s liquid-cooled 300SEF-R features a performance-oriented aluminum twin radiator system with an expansion tank for consistent operating temperatures and engine protection under harsh real-world riding. Factory fill is a long-life coolant, and the design is optimized for Minerva Perma Universal D 4 at -25°C for full corrosion protection and freeze resistance[1]. Always use a high-quality ethylene glycol-based motorcycle coolant approved for Sherco engines – never plain water or automotive-only types.

Tools & Supplies You Need

  • Approved motorcycle coolant (1.1 liters)
  • Drain pan (hold at least 2 quarts/liters)
  • 8mm and 10mm sockets or wrenches
  • New radiator bleed screw gasket (recommended)
  • Shop towels/rags and eye protection

Coolant Change Procedure for the Sherco 300SEF-R

  1. Preparation:
    • Make sure the bike is on a level surface, fully cooled, upright (use a stand), and that the radiators are not under pressure.
    • Remove the radiator shrouds for easier access if needed.
  2. Drain the Old Coolant:
    • Locate the coolant drain bolt on the lower water pump cover (left side of engine) and place your drain pan underneath [3].
    • Remove the radiator cap to release any vacuum, then remove the drain bolt and let the coolant fully drain.
    • Dispose of old coolant responsibly at a designated recycling center.
  3. Fill the System:
    • Reinstall the drain bolt and torque it to 6Nm to prevent leaks [2].
    • Remove the bleed screw on the left side of the radiator to vent trapped air [1].
    • Slowly pour new coolant into the radiator cap opening until it flows bubble-free from the bleed screw opening.
    • Reinstall and torque the bleed screw with a new gasket (8Nm is standard).
    • Continue topping up coolant to the LEVEL mark in the expansion tank (about 1.1 liters total).
  4. Bleed & Check:
    • Replace the radiator cap.
    • Start the engine with the bike upright, allow it to reach operating temperature, and watch for air bubbles – check the coolant level again after the bike cools and top off as needed.
  5. Inspect for Leaks:
    • Check around the water pump, drain bolt, and radiator connections for any signs of leakage.
    • If you see coolant leaking from the water pump weep hole, this indicates a bad seal, which will require water pump service (a common Sherco maintenance item) [2].

Sherco 300SEF-R Owner Notes

  • Do not use water or unapproved fluids; doing so can rapidly corrode engine components and void your warranty.
  • Only open the cooling system when fully cool to avoid scalding injuries.
  • If you ride in extremely hot or muddy conditions, inspect the radiator for clogs – clean as needed for optimal airflow.
  • The Sherco cooling system is self-bleeding when the procedure above is followed, but trapped air can cause overheating. Inspect coolant level regularly, especially after the first ride post-exchange.
  • If replacing the water pump seal or bearings, follow the workshop manual for correct part numbers, gaskets, torque specs, and reinstall steps – the clutch cover must be removed in this model year [2][3].

A routine coolant change, done correctly, can extend the life of your 2022 Sherco 300SEF-R and keep performance at its best. For all the parts you need, from OEM coolant to gaskets and water pump supplies, MotoSport has you covered.

Related Shopping Categories

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Shop Tools for a 2022 Sherco 300SEF-R Dirt Bike.

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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.