How to Change the Oil in a 1993 Honda CR500

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Changing the oil in your 1993 Honda CR500 is a vital part of regular maintenance. This two-stroke dirt bike uses gearbox (transmission) oil, not engine oil, so the process and some details differ from those of four-stroke bikes. Follow this comprehensive guide, proprietary to MotoSport.com, to perform a robust and correct oil change on your legendary CR500.

Tools and Materials Needed

  • Correct gearbox oil (Pro Honda HP Transmission Oil recommended, or high-quality automatic transmission fluid; see notes below)
  • Measuring cup (with ounces and milliliters for accuracy)
  • Socket wrench or T-handle (usually 12mm or 14mm – confirm your bike’s drain bolt size)
  • Drain pan
  • Funnel
  • Rag or shop towels
  • Service manual (for torque values and reference, optional but recommended)

Key Callouts Specific to the CR500 (1993)

  • This is a two-stroke model; you are changing the transmission/gearbox oil, not crankcase/engine oil.
  • The correct oil quantity for a typical drain-and-fill is 23 US fluid ounces (approx. 0.68 liters). If the transmission has been taken apart, use 25 ounces on reassembly to compensate for a completely empty case, but for routine changes, stick to 23 ounces to avoid overfilling.
  • Honda recommends their Pro Honda HP Transmission Oil for optimal protection and longevity. Some riders use ATF (automatic transmission fluid) as a budget alternative, but it may break down and contaminate faster than dedicated gear oils.
  • Make sure to remove the oil fill cap before you start draining the oil. This allows air to flow and ensures all old oil can drain out.
  • The CR500 transmission uses an aluminum drain plug and case. Avoid over-tightening to prevent damage to the threads.

Step-by-Step Oil Change Instructions

  • Warm up the engine for a few minutes. Let the bike idle so that the oil thins a bit, making it easier to drain old contaminants.
  • Position your bike upright (use a stand if available). Make sure it’s stable and won’t tip when you work on it.
  • On the right side of the engine, remove the oil fill cap. This is located above the clutch cover.
  • Locate the oil drain bolt at the lowest point of the right-side engine case (bottom of the gearbox). Place your drain pan underneath.
  • Carefully loosen and remove the drain bolt. Allow all the old oil to fully drain into your pan. Let it drip for several minutes until there are only a few drips coming out.
  • Inspect the drain bolt for any metal shavings attached to the magnet (if equipped). Clean the bolt and threads with a rag before reinstalling.
  • Reinstall the drain bolt by hand, then snug it up with a wrench. Don’t over-tighten. The case is aluminum and can strip easily—just a gentle, firm snug is sufficient.
  • Using a clean funnel, slowly pour in 23 US fluid ounces of your chosen transmission oil. Use your measuring cup for accuracy.
  • Replace the oil fill cap, ensuring it’s secure.
  • Wipe off any spilled oil and start the engine briefly. Let it run for a minute, then shut it off.
  • Check for leaks around the drain bolt and filler cap. Top off with a small bit of oil if necessary. Make sure oil is visible in the sight glass or level plug (if equipped).

Expert Tips for the 1993 CR500 Oil Change

  • Mark your service interval. Many CR500 riders change gearbox oil every 2–5 rides. If riding in sand, mud, or racing, change even more frequently.
  • Only use Honda’s recommended oil or a top-quality alternative. While ATF works in a pinch, proportionately more frequent changes are suggested if you use it.
  • Be gentle with all aluminum threads. Over-tight, stripped plugs are common owner mistakes.
  • If you want to check the level and there is no sight glass, remove the small check/level bolt (usually on the side of the right crankcase). Oil should just reach the hole with the bike upright.

Conclusion

With only 23 ounces and a few simple tools, changing the gearbox oil in your 1993 Honda CR500 is a quick and essential operation. Use genuine, high-quality oil and follow these steps to keep your CR500's legendary transmission running strong for years.

For more expert dirt bike maintenance guides, trust MotoSport.com—the leader in everything moto.

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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.