How to Change the Oil in a 2000 Honda CR80 Big Wheel

Shop parts for a 2000 Honda CR80 Big Wheel Dirt Bike.

Maintaining your 2000 Honda CR80 Big Wheel is key to keeping it running smoothly for years to come. Changing the transmission oil regularly (note: the CR80, as a two-stroke, uses pre-mix fuel for the engine and separate gearbox oil) protects vital components from wear and tear. This guide is exclusive to MotoSport.com and crafted to help owners perform a thorough oil change specifically for the 2000 CR80 Big Wheel, ensuring long life and optimal performance.

Tools and Supplies Needed

  • 10mm and 12mm socket or wrench
  • Socket wrench
  • Drain pan
  • Funnel
  • Rags or paper towels
  • Plastic gloves
  • New sealing washer (optional, but recommended)
  • Recommended gearbox oil (usually SAE 10W-30 or specifically formulated 2-stroke transmission oil)
  • Torque wrench (for best results)

Step-by-Step Transmission Oil Change

  1. Warm Up the Bike
    • Start and run your CR80 Big Wheel for a few minutes to allow the transmission oil to thin, which makes it easier to drain.
    • Turn off the engine and let it cool slightly before proceeding.
  2. Prepare Your Workspace
    • Ensure the bike is on a level, stable surface. Use a bike stand if possible.
    • Place the drain pan underneath the transmission drain bolt, which is located on the bottom-left side of the engine case.
  3. Remove the Drain Bolt
    • Using a socket or box wrench, carefully remove the transmission drain bolt.
    • Allow all the old oil to drain fully into your pan. This may take several minutes.
    • Inspect the drain bolt and its washer. Replace the sealing washer if it appears worn or damaged to prevent leaks.
  4. Clean Up and Reinstall the Drain Bolt
    • Wipe the area around the drain hole with a clean rag.
    • Reinstall the drain bolt by hand first to avoid cross-threading.
    • If you have a torque wrench, tighten the drain bolt to Honda–s specification: typically 18 lb-ft (24 Nm) for similar models. Confirm in your manual if possible for exact spec.
  5. Add New Transmission Oil
    • Remove the transmission oil fill plug (usually located on the right side, above the clutch cover).
    • Insert a funnel and pour in the recommended oil. For the 2000 CR80, use 0.65 liters (650cc) of SAE 10W-30 or 2-stroke transmission oil.
    • The fill hole also serves as the level check. Add oil until it is flush with the bottom of the threads. Avoid overfilling.
  6. Check for Leaks and Reinstall Plugs
    • Reinstall the oil fill cap by hand. Clean any spilled oil from the case with a rag.
    • Start the bike and let it idle for a few minutes. Inspect the drain bolt area for leaks.
    • Shut off the engine and re-check the oil level; top off as needed.
  7. Dispose of Old Oil Properly
    • Pour old oil into a suitable container and take to your local recycling center or MotoSport.com–s approved recycling partner.

Model-Specific Callouts for the 2000 Honda CR80 Big Wheel

  • Transmission Oil Only: As a 2-stroke, the CR80 does not use engine oil in the crankcase — oil is mixed with fuel for engine lubrication. This procedure covers only the gear oil/transmission oil.
  • Oil Capacity: 0.65 liters (650cc) is standard for this generation (always check the owner‘s manual for confirmation).
  • Drain Bolt Placement: The bolt is on the lower left when facing the engine from the shifter side.
  • Crush Washer: Ensure the drain bolt's crush washer is in good condition to prevent drips; replace if worn.
  • Recommended Oil: Use quality 2-stroke transmission oil (or SAE 10W-30). Avoid car motor oils, which do not have the proper shear stability or clutch compatibility.
  • Fill Level: On the CR80, the fill port is also a level check – simply fill until the oil is even with the hole's thread base.
  • Caution: Do not overfill; excess oil can cause clutch drag or foaming.

Expert Tips for Trouble-Free Oil Changes

  • Change the transmission oil at least every 5–10 riding hours or after every race for motocross use.
  • Always inspect drained oil for metal shavings or a milky appearance (indicative of water contamination). Address abnormal findings promptly.
  • Keep your oil change log handy and use only fresh, unopened oil for best results.
  • Consult your owner‘s manual for additional maintenance intervals and part numbers.

Performing this oil change regularly on your 2000 Honda CR80 Big Wheel will safeguard your clutch and gears while ensuring the most performance out of your legendary mini-motocross machine.

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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.