How to Change the Coolant in a 1995 Yamaha RT180
Shop parts for a 1995 Yamaha RT180 Dirt Bike.
If you own a 1995 Yamaha RT180, routine coolant changes are crucial to keep your 2-stroke engine running cool and reliable. The RT180 uses a liquid-cooling system designed for trail reliability and easy maintenance–features appreciated by both new and experienced riders. Follow this unique MotoSport.com guide for a safe, thorough coolant change suited specifically to your RT180 model.
What You’ll Need
- Premixed motorcycle coolant (ethylene glycol based, silicate-free for aluminum)
- Distilled water (for flushing, if desired)
- Basic hand tools (sockets, screwdrivers, pliers)
- Drain pan
- Funnel
- Gloves and rags
Special Notes for the 1995 Yamaha RT180
- The RT180’s compact radiator and simple cooling circuit make DIY maintenance straightforward, even for beginners.
- Being a two-stroke, there’s no thermostat – coolant flows continuously, so you won’t have a temperature-based "fan on" moment when bleeding air.
- RT180s can accumulate scale and debris in coolant passages if neglected, so flushing every other change is recommended.
Step-by-Step Coolant Change Guide
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Preparation:
- Move the bike to a stable, well-ventilated surface and ensure the engine is completely cool.
- Remove the seat and side covers if needed for better access to the radiator cap and hoses.
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Drain the Old Coolant:
- Locate the radiator cap (on the left side of the steering head) and remove it.
- Place a drain pan under the water pump (right side, bottom of the engine).
- Remove the coolant drain bolt (or loosen the lower radiator hose) to allow coolant to drain fully.
- Squeeze the hoses gently to help remove more old coolant.
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Flush the System (Optional but Recommended):
- Temporarily reinstall the drain bolt or lower hose.
- Fill the system with distilled water.
- Start the engine for about 30 seconds with the radiator cap off, then shut off and drain again.
- Repeat if the drained water is still tinted.
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Refill with Fresh Coolant:
- Reinstall the drain bolt and tighten (do not overtighten).
- Using a funnel, slowly fill the radiator with motorcycle coolant up to the base of the filler neck. Pause and gently rock the bike to help trapped air escape.
- If equipped, fill the overflow reservoir to the "Full" line; if not, proceed.
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Bleed Air from the System:
- With the radiator cap still off, start the bike and let it idle for about a minute. Blip the throttle a few times to help bubbles move up and out.
- Once the coolant settles and you see no more bubbles, top up to the base of the neck if needed, then secure the radiator cap.
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Final Level Check & Clean Up:
- After the first short ride, let the bike cool down, then recheck coolant level in the radiator and refill if necessary.
- Dispose of old coolant responsibly – never pour it down the drain or on the ground.
Pro Tips for RT180 Owners
- Keep an eye on the radiator for fin damage or debris, especially if you ride wooded trails.
- Use only recommended coolants and distilled water to prevent scale in the head and pump passages.
- The RT180’s cooling system is simple, but regular checks prevent costly top-end repairs – inspect annually.
With this detailed procedure from MotoSport.com, your 1995 Yamaha RT180 will stay cooler and run longer, mile after mile.
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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.