How to Change the Coolant in a 2001 Honda CR80 Big Wheel

Shop parts for a 2001 Honda CR80RB Dirt Bike.

If you own a 2001 Honda CR80 Big Wheel, keeping the cooling system serviced is key to ensuring reliable performance on the track or trail. Regular coolant changes protect your engine from overheating, corrosion, and premature wear, especially on a high-revving two-stroke like the CR80RB. Follow these steps to properly change the coolant and keep your CR80 RB running strong.

Required Tools & Supplies

  • Phillips screwdriver & socket set
  • Drain pan or bucket
  • Fresh motorcycle-specific coolant (ethylene glycol-based, silicate-free)
  • Distilled water (if mixing coolant yourself)
  • Funnel
  • Clean rags
  • Torque wrench (recommended)
  • Protective gloves & eyewear

Step-by-Step Guide

  1. Let the Bike Cool Completely: Hot coolant is dangerous – always perform this service with the engine cold.
  2. Remove the Seat & Side Shrouds: To access the radiator and filler neck, use your screwdriver and socket set to remove the seat and plastic radiator shrouds. This also allows a better inspection of hoses and radiator fins. Be careful not to lose the plastic tabs or bolts when removing the shrouds.
  3. Locate the Radiator Cap & Drain Bolt: The radiator cap is on top of the left-side radiator. The coolant drain bolt is typically located at the water pump cover at the lowest point of the right side engine case.
  4. Position Your Drain Pan: Place a pan directly below the water pump drain bolt to catch old coolant. Loosen (but do not yet remove) the radiator cap to avoid splashing.
  5. Remove the Drain Bolt: Using the correct size socket or wrench, carefully remove the water pump drain bolt. If present, also loosen the lower radiator hose to speed drainage. Once old coolant stops flowing, re-install and hand-tighten the drain bolt (replace the crush washer if it looks worn or damaged).
  6. Inspect Hoses & Clamps: Look for cracks, stiffness, or wear on hoses and verify all clamps are tight & corrosion-free. Replace as needed to ensure a leak-free cooling system.
  7. Flush (Optional): For an extra clean system, pour distilled water into the radiator, replace the cap, and run the bike for a minute. Let it cool, then repeat the drain process. Always drain completely before adding new coolant.
  8. Refill with Fresh Coolant: Uncap the radiator and use a funnel to pour in new motorcycle coolant (pre-mixed or properly diluted with distilled water) up to the filler neck. Check your owner's manual for capacity, but typically, the system holds slightly less than one quart. Avoid overfilling.
  9. Burp the System: With the front wheel slightly elevated, slowly rock the bike and squeeze radiator hoses to remove trapped air. Start the engine with the cap off for a minute, watch for air bubbles – add more coolant if the level drops. Do not let the bike overheat at this stage.
  10. Reinstall the Cap & Check for Leaks: Tighten the radiator cap securely. Reinstall shrouds and the seat. Run the engine for a few minutes and inspect for leaks around the hoses and drain bolt.
  11. Suspend Used Coolant Responsibly: Take old coolant to a recycling center or auto parts store. Never pour it down the drain or onto the ground.

Important Notes for the 2001 Honda CR80 Big Wheel

  • Engine Protection: Only use coolant safe for aluminum radiators and wet-sump systems. Mix with distilled water to prevent deposits.
  • Coolant Capacity: This model has a compact cooling system. Overfilling could cause overflow; underfilling risks overheating.
  • Model-Specific Inspection: The CR80 Big Wheel (RB) features larger wheels and slightly different bodywork, which may require different steps for plastic removal. Ensure all tabs realign correctly during reassembly to prevent rattles and loss of shroud hardware.
  • Frequent Riding: For bikes used regularly or in muddy/wet environments, inspect and replace coolant at least once per season. Two-strokes like the CR80 RB operate at higher RPMs and run hotter than many four-strokes, making cooling system maintenance especially critical.

Proper coolant changes help extend the life of your 2001 Honda CR80 Big Wheel and ensure maximum performance for every ride. For the best selection of OEM and aftermarket replacement parts, maintenance tools, and coolants, rely on MotoSport to keep your bike competition-ready.

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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.