How to Change the Oil in a 1995 Honda CR80

Shop parts for a 1995 Honda CR80 Dirt Bike.

Performing a regular oil change is essential for keeping your 1995 Honda CR80 running smoothly and maximizing engine life. While the process is straightforward, there are some key steps specific to this two-stroke motocross bike that every owner should know.

Tools and Materials Needed

  • Socket wrench set (typically 10mm or 12mm for drain bolt)
  • Drain pan
  • Funnel
  • Measuring cup or oil jug with measurements
  • New transmission oil (Recommended: Pro Honda HP Trans Oil, Pro Honda GN4, or HP4, SAE 10W-40 or equivalent for the transmission oil)
  • Rags or shop towels
  • Gloves (optional, but recommended for cleanliness)
  • Torque wrench (optional, for properly tightening the drain bolt)

Before You Begin

  • Always work on a cold engine, or let it cool for at least 30 minutes after riding to prevent burns.
  • Prepare a clean workspace with good lighting and place your bike upright on a stand for stability.

Step-by-Step Oil Change Procedure

  1. Warm Up the Bike:
    Run the engine for 3 minutes. This helps the oil drain more freely and removes dirt particles suspended in the oil. Shut off the engine and let it sit for a minute.
  2. Locate the Drain Plug:
    Find the drain plug underneath the engine, typically situated near the center. Place your drain pan directly under the plug.
  3. Remove the Drain Plug:
    Use your socket wrench to unscrew the drain plug. Be careful—some oil may come out quickly. Allow the oil to drain completely into the pan.
    Specific to 1995 CR80: The transmission oil capacity is approximately 0.45 liters (0.48 US quarts). Be sure you have an appropriate container if you change oil regularly, as overfilling can occur with larger drain pans not marked for volume.
  4. Inspect the Oil:
    Take note of the color and presence of debris in your old oil. Sludgy, metallic, or milky oil may indicate issues requiring deeper inspection.
  5. Reinstall the Drain Plug:
    Once the oil has fully drained, clean the drain bolt and sealing area. Reinstall and hand-tighten, then use your torque wrench to tighten to manufacturer spec.
    Honda tip: Do not over-tighten, as this can strip the aluminum threads.
  6. Fill with New Oil:
    Remove the oil fill cap (typically on the right-hand engine case). Place a funnel in the filler and pour in 0.45 liters (450 ml) of new oil. Use a measuring cup for accuracy.
    Recommended oil for best performance: Pro Honda HP Trans Oil, Pro Honda GN4 or HP4 (without moly) SAE 10W-40, or another high-quality transmission oil specified for two-stroke gearboxes.
  7. Replace the Filler Cap:
    Tighten securely by hand. Clean off any spilled oil before starting the bike.
  8. Check for Leaks:
    Start the engine and let it idle for a minute, then shut it off and check the drain bolt and filler area for leaks.
  9. Dispose of Old Oil Properly:
    Pour used oil into a sealable container and take it to a recycling center or automotive store that accepts motor oil.

1995 Honda CR80 Oil Change Call-Outs and Tips

  • This is a two-stroke engine. Engine lubrication is via fuel/oil mix, but the transmission/clutch uses separate oil. Make sure you are changing the transmission oil—the engine “oil” is premixed into the fuel.
  • Oil capacity for 1995 CR80 transmission: 0.45 liters (0.48 US quarts). Overfilling can impact clutch performance–underfilling may risk transmission wear.
  • Recommended oil: Pro Honda HP Trans Oil, Pro Honda GN4 or HP4 (without moly) SAE 10W-40 or equivalent high-quality oil. Avoid using gear oils not made for wet clutches, as they can cause slippage or accelerated wear.
  • Frequency: For racing or aggressive riding, change the oil after every few rides; for casual use, follow Honda’s recommendation for “every 300 miles or every 10 hours of use.”
  • Inspect crush washers: If your drain bolt uses a crush washer, inspect and replace as needed to prevent leaks.
  • Tighten carefully: Avoid overtightening both the drain plug and fill cap–you can easily strip the threads on the aluminum engine case.

Conclusion

Following these steps will help keep your 1995 Honda CR80 transmission in peak shape. Use the right oil type, measure carefully, and don’t rush the process. Always check for leaks once finished and dispose of oil responsibly. If you run into trouble or have further questions, check your owner’s manual or consult a Honda mechanic. Happy riding from MotoSport.com.

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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.