How to Change the Coolant in a 2008 Kawasaki KX85
Shop parts for a 2008 Kawasaki KX85 Dirt Bike.
Routine coolant changes keep your 2008 Kawasaki KX85's engine from running hot and prevent internal corrosion. The KX85 is a high-performance youth motocrosser, and coolant maintenance is especially crucial for its compact two-stroke engine, which operates at higher temperatures and demands efficient cooling for peak performance. Follow these step-by-step instructions for the best results – always ensure the engine is completely cool before starting:
What You Will Need
- Fresh coolant (consult your owner's manual for recommended type – most riders use premixed motorcycle coolant formulated for aluminum engines)
- 10mm socket or wrench
- Funnel
- Drain pan
- Shop rags
- Protective gloves & safety glasses
Step-by-Step Coolant Change for the KX85
- Access the radiators: Remove the radiator shrouds to expose the radiator cap and hoses.
- Remove the radiator cap: Turn the cap counterclockwise to release it slowly. Never remove when hot—the system may be pressurized and coolant can cause burns.
- Locate and remove the drain bolt: On the right side of the engine, look for a small drain bolt at the bottom of the water pump cover. Place your drain pan under the area.
Remove the bolt and allow all old coolant to drain. - Flush the system (recommended): Briefly install drain bolt and fill the radiator with distilled water. Replace cap and run engine for 1-2 minutes. Let cool, remove cap, and re-drain completely to ensure all residue and old coolant are removed.
Repeat if needed until water runs clear. - Reinstall drain bolt: Check the drain plug's sealing washer for damage. Replace if needed. Hand-tighten, then torque to spec (do not overtighten to avoid cracking the case).
- Refill with coolant: Using a funnel, slowly pour coolant into the radiator neck until full.
- "Burp" the system: Gently squeeze radiator hoses to help remove trapped air. It's recommended to loosen the small air bleed screw at the cylinder head (if equipped) until coolant flows out evenly, then retighten.
- Top off and check level: Add coolant up to the bottom of the filler neck. Reinstall radiator cap.
- Run the engine: Start and let it idle for a few minutes to circulate coolant and release trapped air. Shut down and allow to cool. Check coolant level and add if necessary.
- Inspect for leaks: Examine drain bolt, radiator hoses, and water pump for any seepage.
KX85 Coolant System Notes
- Coolant capacity: For the 2008 KX85, approximately 0.6L (0.16 gal) of coolant is required. Overfilling can lead to overflowfill only to the recommended level.
- Air removal is crucial: The KX85 does not have a coolant overflow tank like some larger bikes; trapped air can cause hot spots and engine overheating. Always confirm the system is fully "burped."
- Inspect hoses and cap: Old hoses may crack. The radiator cap's seal should be soft and uncracked.
- Frequency: Change coolant every 2 years or more frequently in race or harsh conditions.
- Disposal: Properly dispose of used coolant at a recycling center. Coolant is toxic to people & animals.
Regular coolant changes are key to extending the life of your KX85's high-revving two-stroke engine and maintaining performance. With a little care and attention, your Kawasaki will continue to deliver reliable power and fun for countless rides.
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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.