How to Change the Coolant in a 1995 Yamaha RT100
Shop parts for a 1995 Yamaha RT100 Dirt Bike.
Routine coolant changes help keep your 1995 Yamaha RT100 running at optimal temperature and prevent corrosion inside the engine. While this model is known for its simplicity and robust air-cooled engine, some owners may have installed aftermarket coolant conversion kits, so always confirm your bike’s current configuration before proceeding.
What Makes the 1995 Yamaha RT100 Unique?
The RT100 was engineered as a beginner-friendly trail bike, featuring a rugged two-stroke engine with air cooling instead of a traditional liquid cooling system. Most original RT100s do not have a liquid cooling system from the factory, relying on airflow over the cylinder fins to regulate engine temperature. However, custom builds or performance modifications may add a coolant system. If your RT100 has a radiator or expansion tank, you likely have an aftermarket cooling system. In that case, follow these steps. If not, your engine does not use coolant and maintenance should focus on keeping air passages clean and unobstructed.
Step-by-Step: Changing Coolant on an Aftermarket-Equipped RT100
- Let the engine cool completely before starting to avoid burns.
- Locate the radiator and coolant drains. On a coolant-equipped RT100, identify the radiator cap, overflow tank, and drain bolt (typically near the bottom of the radiator or water pump).
- Position a drain pan under the bike. Remove the radiator cap to release pressure.
- Remove the drain bolt and let the old coolant flow out. Inspect the drained liquid for contamination (oil or rust may signal engine issues).
- Reinstall the drain bolt securely once the system is empty.
- Fill with quality coolant. Use a 50/50 premix designed for powersports or recommended by Yamaha. Slowly pour coolant into the radiator until full.
- Bleed air from the system: Rock the bike gently to coax bubbles upward. Some setups have a bleed screw to allow trapped air outopen briefly, then close when coolant emerges.
- Start the engine with the radiator cap off and let it idle a few minutes–watch the coolant level drop as air escapes. Add more coolant as needed until stable, then install the cap.
- Check the overflow tank and fill to the specified 'full' line if equipped.
- Test ride and inspect for leaks. After cooling completely, check coolant levels again and top off if needed.
Special Considerations for RT100 Owners
- The stock 1995 RT100 is air-cooled and does not have a radiator or coolant from the factory. Only perform this procedure if your bike has been converted for liquid cooling.
- For air-cooled units, routine engine maintenance includes removing dirt and debris from the cooling fins and verifying good airflow around the cylinder.
General Pro Tips
- Reuse old coolant only if it’s clean and uncontaminated, but always check for debris or rust.
- Dispose of old coolant responsiblynever pour it down the drain or onto the ground.
- Keep maintenance intervals consistent; even if rarely used, coolant breaks down and should be replaced every two years if applicable.
- Always mark the service date and mileage for easy tracking.
The 1995 Yamaha RT100's simplicity makes it a breeze to maintain. Owners with original air-cooled bikes only need to keep those finned cylinders clean. For the rare RT100 with liquid cooling, a well-done coolant flush ensures peak performance and engine longevity.
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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.