How to Change the Coolant in a 2018 Sherco 450 SEF-R
Shop parts for a 2018 Sherco 450 SEF-R Dirt Bike.
Keeping your 2018 Sherco 450 SEF-R running at peak performance means regular cooling system maintenance. Replacing your coolant ensures your engine remains protected from overheating and corrosion, especially critical for high-performance models like the SEF-R. Follow the step-by-step MotoSport guide below–tailored for your bike–to keep your ride in top condition.
What You’ll Need
- Approved coolant (Minerva Perma Universal D 4 or equivalent rated to −25°C; never use just water or non-approved fluids)
- Drain pan
- Socket set (M6 for bleed screw)
- New gasket for bleed screw (recommended)
- Rags or shop towels
- Protective gloves
Step-by-Step Coolant Change Instructions
- Prepare the Bike
Ensure the Sherco 450 SEF-R is upright and on a horizontal surface. Only work with the engine completely cool to avoid burns from hot coolant. - Locate the Cooling System Components
Find the radiator cap at the top of the left radiator. The coolant drain bolt and bleed screw are on the left side of the radiator. - Drain the Old Coolant
Place a drain pan under the water pump area. Slowly loosen and remove the radiator cap to vent the system.
Remove the coolant drain bolt or the lowest hose on the water pump housing.
Allow all coolant to fully drain. Dispose of old coolant responsibly–never pour it into the ground or drains; use an approved collection center. - Bleed the Radiator
Loosen the M6 bleed screw (typically 8Nm torque) on the left radiator to help air escape as the coolant drains. This ensures a complete flush. - Inspect and Refit Drain Plug
Check the gasket on the drain bolt and replace if damaged. Reinstall and torque the drain bolt to proper specs (usually 6Nm). - Add New Coolant
Slowly pour fresh coolant into the radiator until it reaches the "LEVEL" mark on the expansion bottle. Leave the bleed screw open as you fill; once coolant flows out free of bubbles, close and tighten the bleed screw with a new gasket if available.
The system capacity is about 1.1 liters. Do not overfill. - Final Checks
With the cap off, tip the bike gently side-to-side several times. Top up if needed. Replace and tighten the radiator cap. - Start and Inspect
Start the engine and let it idle for a few minutes, then shut off and allow it to cool.
Recheck coolant level at the expansion bottle; top off if necessary.
Model-Specific Notes for the 2018 Sherco 450 SEF-R
- 2018-and-later models feature updates over earlier years–they do not have the problematic plastic "T" coolant fitting found on pre-2018 Sherco 450s, which greatly improves reliability.
- Only use manufacturer-recommended coolant to protect internals, including the magnesium alloy components.
- Routine cooling system checks help prevent leaks at pump seals. If you regularly find coolant in the weep hole below the water pump, this signals a possible water pump seal failure–address promptly.
- Always follow recommended torque settings and check for leaks after servicing the system.
Why Routine Coolant Maintenance Matters
- Maintains optimal engine temperature and performance during aggressive riding or racing
- Protects against corrosion and scale that can harm magnesium and aluminum parts
- Extends water pump life and prevents overheating disasters
With these instructions, your 2018 Sherco 450 SEF-R will keep its cool on any ride. For any additional parts or service items you might need during maintenance, shop with confidence at MotoSport for genuine and aftermarket Sherco-compatible gear.
Related Shopping Categories
Shop Radiators for a 2018 Sherco 450 SEF-R Dirt Bike.
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Shop Tools for a 2018 Sherco 450 SEF-R Dirt Bike.
Shop Radiator Hoses for a 2018 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.