How to Change the Coolant in a 1979 Suzuki RM60
Shop parts for a 1979 Suzuki RM60 Dirt Bike.
Proper cooling is essential for your 1979 Suzuki RM60’s two-stroke engine – maintaining the right coolant level and condition prevents overheating, ensures optimal performance, and extends your dirt bike’s overall lifespan. While the RM60 is known for its simplicity and ruggedness, regular coolant changes are a key part of keeping this classic mini-motocrosser running strong for decades to come.
What Makes the 1979 RM60 Unique?
The 1979 RM60 is a minimalist, air-cooled two-stroke motocrosser designed for youth riders. Unlike modern bikes, there are no radiators – instead, the RM60 relies on its air-cooled cylinder fins for temperature management. However, if your RM60 has been modified with an aftermarket liquid-cooling system (a rare but possible update), the following process applies. Otherwise, standard models only require regular engine oil changes and fin cleaning for best cooling – there is no factory coolant to change.
Tools & Supplies You Will Need
- New engine coolant (if modified to liquid cooled)
- Basic hand tools – socket set, screwdrivers, pliers
- Drain pan
- Rags or shop towels
- Protective gloves
Step-by-Step Coolant Change (for Liquid-Cooled Modifications)
- Cool the Engine: Make sure the bike is completely cool before working on the cooling system to avoid burns.
- Locate the Drain Bolt: Find the coolant drain bolt at the bottom of the water pump cover, or (if none) remove the lower radiator hose on a liquid-cooled kit.
- Drain the System: Place a drain pan under the bike. Remove the radiator cap first for better flow and then loosen the drain bolt or hose. Allow all old coolant to fully drain out.
- Flush (Optional but Recommended): To remove residues, fill the system with distilled water, start the engine, and let it run briefly. Drain the water. Repeat if needed until clear.
- Inspect Components: Check hoses for cracks, and hose clamps for tightness and rust. Inspect the water pump gasket if accessible.
- Refill: Secure the drain bolt or lower hose. Use a funnel to slowly fill the radiator with fresh coolant up to the base of the filler neck. Fill the expansion tank to the "full" mark if your setup has one.
- Bleed Air: Rock the bike gently and squeeze the hoses to help purge trapped air. Some systems have a dedicated bleeder screw – open it briefly until coolant flows without bubbles, then re-tighten.
- Warm Up & Recheck: Start the engine, bring it up to operating temperature, then shut off and allow to cool. Recheck coolant levels and top off if needed. Inspect for leaks.
Things RM60 Owners Should Know
- The 1979 RM60 was originally air-cooled from the factory. If you have an unmodified stock model, there is no engine coolant to change – cooling relies on external air and fin cleanliness.
- If your bike has a custom or aftermarket liquid-cooling kit, use only the recommended coolant and follow the instructions above for servicing.
- Always clean dirt and debris from cylinder fins for maximum heat dissipation. Overheated engines may need a top-end rebuild.
- Inspect engine oil regularly – your RM60 lubricates the engine and gearbox with oil, not coolant.
Keep Your Vintage Suzuki RM60 Running Strong
Staying on top of all maintenance tasks is vital for classic motorcycles like the RM60. Always reference a reputable service manual and use quality replacement parts designed for your exactly your model and year. With routine care, your 1979 Suzuki RM60 will continue to deliver reliable fun for years to come.
Related Shopping Categories
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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.