How to Change the Oil in a 1990 Honda CR500

Shop parts for a 1990 Honda CR500 Dirt Bike.

Changing the oil on your 1990 Honda CR500 is a critical aspect of regular maintenance that ensures a long engine life and optimal performance. Follow this step-by-step guide, proprietary to MotoSport.com, for a robust and effective oil change process tailored specifically to your CR500. We'll cover the tools required, the procedure in detail, and important model-specific call-outs you need to know.

Tools and Supplies Needed

  • Socket wrench set (ideally metric)
  • Oil drain pan
  • Measuring cup (graduated in ounces and milliliters)
  • Funnel
  • Shop rags or paper towels
  • Replacement gear oil – 23 US fluid ounces (recommended: Pro Honda gear oil or a quality 75W/80W gear oil)
  • Rubber gloves (optional but highly recommended)
  • Torque wrench (for re-tightening drain bolt to proper spec)

Step-by-Step Oil Change Instructions

  1. Warm Up the Engine
    Start your CR500 and let it idle for 2–3 minutes. This warms the oil, helping it flow more freely and carry out contaminants.
  2. Secure the Bike
    Place the bike on a level surface and use a center stand or triangle stand so it remains stable and upright while you work.
  3. Locate the Drain Plug
    The oil drain plug on the 1990 CR500 is located at the bottom of the engine case. Place your oil drain pan beneath the plug to catch old oil.
  4. Remove the Oil Filler Cap
    Before loosening the drain plug, remove the oil filler cap on the right side of the case. This prevents a vacuum and allows the oil to drain fully out of the engine

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  5. Loosen and Remove Drain Plug
    Use your socket wrench to loosen and remove the drain bolt. Allow the oil to drain completely. This may take several minutes; tipping the bike very slightly (if safely possible) can help remove any remaining oil.
  6. Inspect and Replace the Drain Plug
    Wipe the drain bolt clean, inspect its sealing washer for wear, and replace the washer if needed. Screw the drain bolt back into place and tighten gently with your torque wrench. Do not overtighten, as the case is made of aluminum and can be stripped easily

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  7. Add New Oil
    With the drain bolt securely in place, use a funnel to slowly pour in exactly 23 US fluid ounces (approximately 680cc) of your preferred gear oil—Pro Honda oil is recommended, though some use automatic transmission fluid; however, genuine gear oil is better for longevity

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    • Do not overfill—stick carefully to the factory volume. For complete rebuilds, slightly more (25 oz) may be needed, but stick to 23 oz for regular changes. Overfilling can cause leaking or pressure issues

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  8. Replace Filler Cap and Wipe Excess Oil
    Once filled, re-install the oil filler cap and wipe away any spilled oil from the engine case.
  9. Start the Engine and Check for Leaks
    Start your CR500 and let it idle for a minute, then turn off and inspect around the drain bolt and filler cap for leaks. Tighten gently if seepage is detected.
  10. Dispose of Used Oil Properly
    Pour the used oil into an appropriate container and recycle it at your local auto parts store or hazardous waste center.

Model-Specific Call-outs for the 1990 Honda CR500

  • Oil Capacity: Stick to 23 US fluid ounces (680cc) for routine changes. Only use 25 oz if the engine has been completely disassembled and cleaned, as residual oil in the transmission and cases prevents full draining during a standard change

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  • Oil Type: While some owners opt for automatic transmission fluid (ATF), genuine 2-stroke gearbox oil (like Pro Honda gear oil) is recommended for best clutch performance and to avoid premature contamination

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  • Frequency: Recommended every 2–4 rides, or more frequently in severe riding conditions or racing scenarios

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  • Drain Plug Torque: Be cautious—aluminum threads are easy to strip. Tighten the drain plug firmly but avoid over-tightening. Use a torque wrench if available; consult your service manual for the precise spec.
  • Watch for “Milkiness”: If the drained oil looks milky, it could indicate a bad seal and coolant leaking into the transmission. Immediate service is recommended.
  • General Cleanliness: Always clean the area around the filler and drain plugs before removing to prevent dirt from entering the engine case.

Pro Tips from the MotoSport.com Team

  • Allow the oil to drain as long as possible for a more thorough flush. Some owners tip the bike from side to side gently (while secure) to ensure maximum old oil removal.
  • Use a measuring cup to verify oil volume rather than relying on sight glass or dipstick method alone; the CR500 does not have a dipstick.
  • Keep extra drain plug washers on hand; they are inexpensive and easy to replace if damaged or lost.

Conclusion

Changing the oil in your 1990 Honda CR500 is straightforward, but a little care goes a long way in ensuring lasting engine performance. Use quality oil, stick to the correct volume, and handle all bolts gently. With these steps, your CR500 will deliver the performance MotoSport.com riders expect for years to come.

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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.