How to Change the Coolant in a 2000 Honda CR80 Big Wheel (CR80RB)
Shop parts for a 2000 Honda CR80RB Dirt Bike.
Keeping your 2000 Honda CR80 Big Wheel (CR80RB) cooling system in top condition is crucial for both racing and recreational performance. Below, you will find a comprehensive, MotoSport-exclusive step-by-step guide to changing your coolant and ensuring the longevity of your engine.
Why Change Your Coolant?
Fresh coolant maintains engine temperature, prevents overheating, and protects the aluminum radiator from corrosion. For a high-revving two-stroke like the CR80RB, regular fluid maintenance is a must for reliability and optimal riding conditions.
Tools and Supplies Needed
- High-quality ethylene glycol-based motorcycle coolant (never use automotive coolants with silicate-based inhibitors)
- Drain pan
- 8mm/10mm socket and ratchet
- Screwdriver (for radiator cap and possibly bodywork)
- Clean funnel
- Torque wrench (optional, but recommended for proper reassembly)
- Rags and gloves
Preparation
- Ensure the engine is completely cool before starting. Hot coolant can cause serious injury.
- Place the bike on a stable stand and remove the seat and side shrouds if they obstruct access to the radiator cap or hoses.
Step-by-Step Coolant Change Procedure
-
Locate the Radiator and Drain Bolt
The CR80RB has a single radiator on the left side. The drain bolt is typically on the lower side of the radiator or water pump cover. Place a drain pan underneath. -
Remove the Radiator Cap
Slowly loosen the cap to release any residual pressure. -
Drain the Old Coolant
Remove the drain bolt and let the coolant drain into your pan. Some coolant may also remain in the hoses and engine; gently rock the bike side-to-side to help fully evacuate the system.
Inspect hoses for cracks or brittleness and the radiator for bent fins during this step. Replace any worn components as needed to prevent leaks or cooling issues. -
Flush (Optional, but Recommended)
For extra cleanliness, flush the system with distilled water, reassemble, run the bike briefly, then drain and refill with coolant. Do not use tap water, which can leave mineral deposits and promote corrosion. -
Reinstall the Drain Bolt
Use a new sealing washer if available, and tighten to manufacturer spec (refer to your service manual if you have a torque wrench; otherwise, firm pressure by hand is sufficient, but avoid overtightening). -
Fill the Radiator
Use your funnel to pour coolant into the radiator until the fluid level reaches the bottom of the filler neck. Avoid spilling—wipe up any drips to keep your garage clean. -
Burp the System
Start the engine with the radiator cap off and let it idle for several minutes. Occasionally give the throttle a gentle blip and tilt the bike lightly to help purge air bubbles. Watch for the coolant to circulate and the level to drop slightly. Top off as needed. -
Check and Fill the Overflow Reservoir
If equipped, fill the overflow reservoir to the "full" mark. This ensures proper operation as the coolant expands and contracts with temperature. -
Final Steps
Reinstall all removed bodywork. Start the engine again and check for leaks. Let the engine cool and recheck coolant level one more time, topping off if needed.
CR80RB Model Notes
- The Big Wheel (CR80RB) features a larger diameter wheelset and slightly higher ground clearance—check that radiator shrouds or hoses are not pinched or in contact with moving suspension components after reassembly.
- Coolant capacity is modest; do not overfill. The system is designed for quick warm-up and efficient cooling—air pockets seriously impact performance, so be diligent about burping air out.
- If you ride in muddy or sandy conditions, periodically inspect your radiator fins and mud guard to prevent clogging and overheating.
Proper Coolant Disposal
Never pour old coolant down the drain or onto the ground. Bring all used fluid to an appropriate recycling center or auto parts store for safe disposal.
Related Shopping Categories
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Shop Radiator Hoses for a 2000 Honda CR80RB 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.