How to Change the Coolant in a 2023 Sherco 300 SEF FACTORY: Step-by-Step Guide
Shop parts for a 2023 Sherco 300 SEF FACTORY Dirt Bike.
Regular coolant changes are vital for optimal engine performance and longevity on your 2023 Sherco 300 SEF FACTORY. This model’s advanced four-stroke engine demands precise care, especially when it comes to managing heat–critical for off-road performance. Follow this proprietary MotoSport guide for a complete coolant change, plus insider details specific to your bike.
What Makes the 2023 300 SEF FACTORY Unique?
- Precision four-stroke powerplant with a high-performance cooling system
- Factory racing radiator and water pump requiring exact coolant specification
- Coolant circuit capacity: approximately 1.1 liters
- Best performance is achieved with approved coolants such as Minerva Perma Universal D 4 –25°C (never substitute water or unapproved fluids)
Tools and Materials Needed
- Approved coolant (Minerva Perma Universal D 4 –25°C or equivalent)
- Socket set (including a 10 mm socket)
- Drain pan
- Funnel
- Fresh gasket for radiator bleed screw (recommended)
- Torque wrench
- Clean rags
- Safety gloves
Step 1: Prepare Your Sherco
- Park on a stable, horizontal surface. Ensure the engine is completely cool before you start.
- Stand the bike vertically for best draining and filling accuracy.
Step 2: Draining the Old Coolant
- Place a drain pan beneath the water pump area.
- Remove the radiator cap to prevent vacuum lock.
- Locate the lower coolant drain screw (usually marked as [A] on the water pump). Use a socket to remove this screw and allow all coolant to drain into the pan.
- Dispose of used coolant at an approved collection center. Never pour into the environment.
Step 3: Bleeding the Radiator
- On the left side of the radiator, locate the bleed screw.
- Remove the bleed screw. This lets trapped air escape and ensures a full system fill during refilling.
Step 4: Refilling with Fresh Coolant
- Insert a funnel in the radiator filler neck.
- Slowly pour coolant into the radiator until it begins to flow steadily out of the bleed screw opening (remove bubbles).
- Reinstall the bleed screw using a fresh gasket, and tighten to 8Nm.
- Continue to fill until the coolant reaches the “LEVEL” mark on the radiator expansion tank. Total fill volume is about 1.1 liters.
- Install and secure the radiator cap.
Step 5: Final Checks – Start and Burp the System
- With the bike upright, start the engine and let it idle for a few minutes with the radiator cap off. Watch for bubbling, which indicates air being purged.
- If the coolant level drops, top off as needed.
- Shut off the engine and securely fasten the radiator cap.
- Inspect for leaks at the drain screw and bleed screw locations.
Special Maintenance Notes for the SEF Factory Model
- Never use plain water or automotive coolant not specifically approved for aluminum motorcycle engines—this can lead to internal corrosion or premature water pump seal failure.
- If regular coolant checks reveal rapid loss, inspect for leaks or possible water pump seal issues (look for weepage under the pump housing).
- The water pump and cooling system components are uniquely tuned for high-load off-road riding on the SEF FACTORY. Stick with the factory bleed and fill method for longest life and peak 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.