How to Change the Coolant in a 1999 Yamaha TW200
Shop parts for a 1999 Yamaha TW200 Dirt Bike.
Changing the coolant in your 1999 Yamaha TW200 is a straightforward, essential maintenance task that ensures your engine stays cool – and your adventures stay trouble-free. While the TW200's air-cooled engine makes it unique among dual sports, this guide covers the complete cooling system flush for models with an aftermarket or auxiliary liquid-cooling setup. If your ride runs the OE air-cooled configuration only, you will not need to perform regular coolant changes, but if you've installed a liquid-cooled conversion or similar kit, follow these detailed steps.
Tools & Supplies Needed
- New coolant recommended for motorcycle engines (pre-mixed or mix with distilled water as specified on bottle)
- Socket kit or wrenches
- Drain pan
- Shop rags
- Replacement sealing washer (recommended)
- Funnel
- Gloves & eye protection
Step-by-Step Coolant Change
-
Allow your TW200 to cool.
Never open the radiator cap (if equipped) on a warm engine. Give the bike ample time to reach ambient temperature. -
Remove any bodywork blocking access.
On a liquid-cooled conversion, access the radiator and overflow tank by removing side panels or covers as needed. -
Remove the radiator cap.
This releases any pressure – always do this before draining. -
Drain the coolant.
Place a drain pan under the water pump or radiator drain bolt. Loosen and remove the drain bolt. Let old coolant fully drain. Also disconnect the lower hose if a drain bolt is not present. -
Flush if needed.
If the coolant is contaminated, fill with distilled water, reinstall the drain bolt, run the engine briefly, then drain again. -
Install a new sealing washer and tighten the drain bolt.
Check that all hoses are secure – a common cause for leaks after reassembly. -
Refill with new coolant.
Use a funnel and pour slowly into the radiator or designated fill port up to the base of the filler neck. Avoid introducing air bubbles by pouring gently. -
Top off the expansion tank (if equipped).
Fill the reservoir to the upper line. -
Burp the system & bleed any trapped air.
Start the engine and let idle for a few minutes with the radiator cap off, carefully blip the throttle several times, then shut down and let cool. Air in the system will rise and escape. Recheck fill level and top off as needed. -
Replace all caps and fittings.
Check that every cap is securely installed. -
Check coolant level after the first ride.
After a complete heat cycle and full cooldown, inspect the coolant level in the radiator and reservoir. Top up if needed and monitor for the first few rides.
Key TW200 Notes & Cautions
- Origin of system: The stock 1999 Yamaha TW200 is air-cooled, so these instructions apply specifically to modified or auxiliary liquid-cooled conversions. If you're unsure, consult your shop for the configuration of your engine before proceeding.
- Coolant choice: Use only motorcycle-specific, silicate-free coolant recommended for aluminum engines.
- Disposal: Always dispose of old coolant safely – never pour down the drain or onto the ground. Local auto parts stores or recycling centers usually accept used coolant.
- Double-check torque settings: Drain bolts and hose clamps should be secure but not over-tightened.
Your 1999 Yamaha TW200 is internationally loved for its reliability & go-anywhere simplicity. Keep up proper maintenance and your dual sport will serve you for miles beyond the pavement. Upgrade, accessorize, and keep your machine running strong with genuine parts and maintenance supplies from MotoSport – your trusted source for all things TW200.
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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.