How to Change the Oil in a 1979 Honda XR500 – A MotoSport.com Exclusive Guide

Shop parts for a 1979 Honda XR500 Dirt Bike.

Changing the oil on your 1979 Honda XR500 is a crucial maintenance task that will keep your bike running smoothly and extend engine life. While the process is straightforward, this model has several unique considerations every owner should know. Follow this robust, step-by-step guide created just for MotoSport.com readers.

Tools and Supplies Needed

  • 17mm or 19mm box-end or socket wrench (for drain bolt)
  • Drain pan (to catch used oil)
  • Cleaning rag or shop towels
  • New engine oil (Honda’s recommendation: SAE 10W-40 for most climates; refer to your owner's manual for specifics)
  • Funnel
  • Replacement crush washer (recommended for drain bolt)
  • Torque wrench (optional but recommended)
  • Parts cleaner or solvent (for cleaning filter screen)
  • Gloves and safety glasses

Preparation Steps

  • Run the engine for 2–3 minutes to warm the oil, allowing it to thin for a more complete drain.
  • Turn off the engine and place the motorcycle securely on a level surface using a center stand or paddock stand.
  • Gather all tools and materials in your immediate work area.
  • Clean the area around the drain bolt to prevent contamination.

Step-by-Step Oil Change Instructions

  1. Locate and remove the oil drain plug:
    • The 1979 XR500 is a wet sump model, meaning all oil is contained in the engine’s crankcase and not in the frame. The drain plug is located on the right side of the engine case, beneath the bike.
      Note: Later XR500 models (>1981) may use a dry sump design with an oil reservoir in the frame, but your 1979 model is wet sump, so no frame draining is necessary.
    • Using your wrench, loosen and remove the drain bolt. Let the oil fully drain into your pan.
    • Check the condition of the drain bolt’s crush washer; replace if worn or damaged to prevent leaks.
  2. Clean the oil filter screen (optional but recommended every few oil changes):
    • The 1979 XR500 uses a mesh filter screen instead of a conventional paper oil filter.
    • To clean it, remove the right side cover using the appropriate wrench or screwdriver.
    • Carefully extract the mesh screen, being mindful not to tear the gasket (if equipped).
    • Rinse the screen with solvent or parts cleaner and let it dry completely before reinstalling.
    • Reinstall the mesh screen and side cover, tightening all bolts securely.
  3. Reinstall the drain plug:
    • Wipe the drain bolt clean. Install a new crush washer if needed.
    • Thread the bolt in by hand to avoid cross-threading, then torque to manufacturer specs (around 18–22 ft-lb is typical; check your owner's manual for the exact figure).
  4. Refill with fresh oil:
    • Remove the oil fill cap on top of the engine.
    • With a funnel, pour new oil into the engine. The 1979 XR500 takes approximately 2 quarts (1.8L) of oil when performing a standard oil change; check your owner's manual to confirm capacity.
    • Allow the oil to settle, then check the level with the dipstick or sight glass as specified by Honda.
    • Add oil in small increments if needed, ensuring not to overfill.
  5. Final steps:
    • Reinstall the oil fill cap and start the engine. Let it idle for a few minutes.
    • Turn off the engine and check for leaks around the drain plug.
    • Wait a few moments, then check the oil level again. Top off if necessary.
    • Properly dispose of the old oil at a certified recycling center.

Model-Specific Tips and Cautions for the 1979 Honda XR500

  • Wet sump design: Unlike later dry sump XR500s, all oil is housed in the engine. Do not attempt to drain oil from the frame—there is no frame oil tank in the 1979 model.
  • Mesh filter, not paper: No paper oil filter is used in this year—just clean the mesh screen. Change your oil regularly since the mesh offers limited fine filtration.
  • Drain bolt location: Verify you’re using the correct bolt on the right side of the crankcase. Draining from the wrong plug (if present) may result in incomplete oil removal.
  • Frequent maintenance required: Because there’s no fine filter, Honda recommends more frequent oil changes for this model, especially after dusty rides or extended hard use.
  • Parts and gaskets: The mesh filter may have a gasket—inspect it for wear and replace if necessary to prevent leaks.
  • Break-in or long-dormant bikes: If your bike has sat for years (as many vintage bikes do), consider a second oil change after a short ride to flush any remaining sludge.

Why Regular Oil Changes Matter

The 1979 XR500’s high-revving, air-cooled single is tough but depends entirely on clean, fresh oil for long-term health. Dirty oil can accelerate wear—so stick to Honda’s recommended intervals found in your owner’s manual, or change more often for aggressive riding or harsh conditions.

Additional Resources

  • Maintain a Honda-approved owner’s manual for your reference.
  • If you need help sourcing parts like the mesh filter or gaskets, check the MotoSport.com vintage section or consult the 1979–80 XR500 OEM parts catalog.

This DIY guide is proprietary content crafted solely for MotoSport.com. Happy wrenching, and keep your classic XR500 roaring.

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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.