How to Change the Coolant in a 2005 Suzuki RM85: Step-by-Step Guide
Shop parts for a 2005 Suzuki RM85 Dirt Bike.
Keeping the coolant fresh and the cooling system clean on your 2005 Suzuki RM85 is crucial–especially for high-revving two-strokes like the RM85, which can run hot when pushed hard. Regular coolant changes help protect the engine from overheating, corrosion, and internal damage.
What Makes the 2005 RM85 Cooling System Unique?
- The RM85 uses a compact, efficient radiator system and only requires a modest 570 ml (1.2/1.0 US/Imp qt) of coolant–making it easy to flush and refill.
- These bikes are designed for aggressive youth and amateur racers, where a clean cooling system maintains consistent power output and extends engine life.
- Frequent off-road use can introduce mud and debris into the radiator and water pump area, so inspection and maintenance are crucial.
What You Will Need
- Fresh coolant recommended for aluminum radiators (never use plain water or tap water).
- Distilled or deionized water for a flush (optional but recommended).
- Catch pan for old coolant–dispose of properly.
- 8mm socket or wrench.
- Block or stand to set the bike upright and level.
- Protective gloves and rags for clean-up.
Step-by-Step: Changing the Coolant
-
Let the Engine Cool
Never open the radiator cap when the bike is hot–wait until the engine is completely cool to prevent burns from scalding steam or fluid. -
Position the Bike
Place your RM85 securely on a block or stand to keep it perfectly upright for an accurate drain and refill. -
Remove the Radiator Cap
Twist and remove the radiator cap to release system pressure and allow coolant to drain freely. -
Drain the Old Coolant
Locate the small drain plug at the bottom of the water pump (use an 8mm wrench). Place your catch pan underneath and remove the plug. Allow coolant to fully drain.
For more complete drainage, disconnect the lower radiator hose at the engine if accessible. -
Flush (Optional)
For best results, pour distilled water into the radiator, replace the cap, and gently tilt the bike side to side to rinse out residues. Drain this water through the same drain plug. Repeat until water runs clear. -
Reinstall the Drain Plug
Clean and reinstall the drain plug snugly (do not overtighten). Reattach any hoses you removed. -
Fill with New Coolant
Pour new coolant slowly into the radiator until full (engine capacity is 570 ml). Allow bubbles to escape. -
Bleed Air from the System
Leave the cap off and tilt the bike side to side to help air bubbles escape. Some owners gently squeeze the radiator hoses as well. -
Reinstall Radiator Cap
Make sure the sealing surface is clean and the cap is free of damage. Tighten the cap firmly. -
Start the Engine
Let the bike idle for several minutes to warm up and circulate the coolant. Shut the engine off, let it cool, then recheck the coolant level and top off to the base of the filler neck if needed. -
Check for Leaks & Inspect Radiator Cap
Check for leaks around the drain plug, hoses, and cap. Inspect the radiator cap seal and replace if worn. The RM85 cap should hold 95–125 kPa (13.5–17.8 psi) pressure.
Extra Tips for RM85 Owners
- Always use aluminum-friendly coolant–avoid coolant types that could corrode lightweight radiator components.
- Inspect the radiator fins while working–bent or clogged fins reduce cooling efficiency. Clean debris carefully with compressed air or a soft brush.
- Never run the RM85 without coolant; overheating can warp the cylinder or damage engine seals.
- If you frequently ride in muddy or silty conditions, consider flushing your coolant more regularly.
Follow these steps, and your 2005 Suzuki RM85 will run cooler and last longer–ready for the next moto or trail ride.
Related Shopping Categories
Shop Radiators for a 2005 Suzuki RM85 Dirt Bike.
Shop Coolant for a 2005 Suzuki RM85 Dirt Bike.
Shop Temperature Sensors for a 2005 Suzuki RM85 Dirt Bike.
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Shop Radiator Hoses for a 2005 Suzuki RM85 Dirt Bike.
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.