How to Change the Coolant in a 2007 Suzuki DRZ400S
Shop parts for a 2007 Suzuki DRZ400S Dirt Bike.
Maintaining optimal cooling performance is essential for the reliability and longevity of your 2007 Suzuki DRZ400S. Swapping old coolant for fresh is a straightforward process, but the DRZ400S has specific features that every owner should keep in mind. This guide walks you through the necessary steps and highlights unique model considerations.
What You'll Need
- Screwdrivers (Phillips and slotted)
- Socket set (primarily 10mm and 12mm)
- Pre-mixed 50/50 motorcycle coolant
- Drain pan
- Distilled or deionized water (for flushing, optional but recommended)
- Clean towels or shop rags
- Protective gloves and eye protection
Step 1: Preparation
- Make sure the engine is completely cool to prevent burns.
- Place the bike on a stable stand or the side stand on a level surface.
- Remove the left and right side covers and, if fitted, the skid plate to expose the radiators and water pump.
Step 2: Draining the Old Coolant
- Locate the water pump cover on the right side of the engine. There is a 10mm hex drain bolt at the lowest pointposition your drain pan below it.
- Open the radiator cap by first removing the small screw (if fitted) holding it in place. Loosen the cap to allow air in and aid draining.–
- Remove the water pump drain bolt and allow the coolant to flow out completely.–
- If desired, flush the system with distilled water to eliminate any residue: replace the drain bolt, fill with water, run the engine briefly, then repeat the draining process.–
Step 3: Bleeding Air and Refilling the System
- Before refilling, inspect the water neck at the top front of the cylinder head. Some 2007 DRZ400S models have a small bleed screwopen it a few turns if present. If the water neck points straight up on your bike, it may not be fitted with a bleed screw.–
- Also check for a bleed screw on top of the left radiator; if present, open it as well.–
- Slowly pour new coolant into the right-side radiator fill neck. As air escapes through the bleed screws, keep adding coolant until it flows steadily from the water neck and left radiator bleeds.
- Snug up bleed screws as soon as only coolant (no air) comes out.–
- Lean the bike far left and right several times to help trapped air move up. Top off the coolant as needed.
- Install and tighten the radiator cap (replace the securing screw if desired).
Step 4: Final Checks and Overflow Bottle
- Start the engine and let it idle for a few minutes, monitoring temperature. Shut off, let cool, and re-check coolant level at the radiatortop off if necessary.–
- Add about 1 inch of coolant to the overflow reservoir (located near the left side panel) to maintain proper system function.–
- Check for leaks at all pointswater pump, bleed screws, radiator cap, and hoses.
- Reinstall bodywork and protective guards.
Model-Specific Notes for the 2007 DRZ400S
- Some 2007 DRZ400S units lack a water neck bleed screw due to design variations. If your water neck faces straight up, skip that screw and only use the left radiator bleed (if present).
- This model does not have a thermostat – temperature is regulated by coolant flow and airflow over radiators.
- DRZ400 radiators are vulnerable in tip-overs; while you have access, inspect for bent fins or leaks, and replace damaged components as needed.
Coolant Disposal Tips
- Never pour used coolant down the drain, into the ground, or in household trash. Recycle at a designated hazardous waste facility or automotive store.
Proper coolant maintenance ensures your Suzuki DRZ400S runs cool and reliably in all riding conditions. For peace of mind on every ride, always use the right products and check fluid levels regularly.
Related Shopping Categories
Shop Radiators for a 2007 Suzuki DRZ400S Dirt Bike.
Shop Coolant for a 2007 Suzuki DRZ400S Dirt Bike.
Shop Temperature Sensors for a 2007 Suzuki DRZ400S Dirt Bike.
Shop Tools for a 2007 Suzuki DRZ400S Dirt Bike.
Shop Radiator Hoses for a 2007 Suzuki DRZ400S 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.