How to Change the Oil in a 1981 Honda XR500: A Step-by-Step MotoSport.com Guide
Shop parts for a 1981 Honda XR500 Dirt Bike.
Regular oil changes are essential to keep your 1981 Honda XR500 running strong and maximizing engine life. This robust, air-cooled thumper requires a straightforward but thorough process to ensure optimal performance and protection. Below are the tools you'll need, the complete step-by-step procedure, and specific call-outs unique to this era of XR500 models.
Tools and Materials Needed
- Socket wrench set (8mm, 10mm, and 12mm as needed)
- Oil drain pan
- Clean rags or shop towels
- Replacement engine oil (refer to owner's manual, typically 10W-40, 4-stroke motorcycle oil)
- Replacement drain plug sealing washer (recommended)
- Metric Allen wrenches or screwdrivers (for removing crankcase cover, right side)
- Funnel
- Rubber gloves (optional, for cleanliness)
- Replacement crankcase side cover gasket (if damaged or reused multiple times)
Step-by-Step Oil Change Instructions
- Warm the Engine: Start the bike and let it idle for about 2-3 minutes. This helps the oil warm up and drain more quickly and thoroughly. Shut off the engine before you start the oil change (Always ensure the motorcycle is stable, preferably on the side stand for best drainage) .
- Remove the Skid Plate (if equipped): Use your socket set to remove the skid plate bolts and put the skid plate aside. This allows clear access to the drain plug and crankcase cover .
- Remove the Oil Filler Cap: Unscrew the oil filler cap/dipstick on top of the right engine case to allow air in and oil to drain out faster .
- Place the Oil Drain Pan under the engine, directly beneath the oil drain plug .
- Remove the Oil Drain Plug: Using the correct size socket, loosen and remove the oil drain plug found near the bottom of the engine. Allow the old oil to drain completely. Replace the sealing washer if worn .
-
Clean or Replace the Oil Filter Screen: The 1981 XR500 does not use a traditional replaceable oil filter. Instead, it has a mesh oil filter screen inside the right crankcase cover. For best results:
- Remove the right foot peg and brake pedal for better access.
- Take off the right crankcase cover (be mindful of the gasket; replace if necessary).
- Extract the oil filter screen and thoroughly clean with brake cleaner or a similar solvent.
- Inspect for debris or damage and reinstall when clean .
- Reinstall the Drain Plug and Cover: Check that the drain plug washer is in good condition, then reinstall and torque the plug to manufacturer specification (typically about 18 ft-lbs; check your manual). Replace the crankcase cover, ensuring the gasket is not pinched or damaged .
- Refill with Fresh Oil: Place a funnel in the oil fill opening and add the recommended type and quantity of oil (consult your owner's manual, but typical fill is approximately 2 liters for oil change with filter screen cleaning). Add oil slowly to avoid overflow .
- Check Oil Level: With the bike upright (not on the side stand), use the dipstick/filler cap to check that the oil is at the correct upper level mark. Add oil as needed .
- Start the Engine and let it idle for 2-3 minutes. Turn off the engine, let the oil settle for a minute, then re-check the oil level. Top up if necessary.
- Inspect for Leaks: Look around the drain plug and crankcase cover for any sign of oil leaks. Re-tighten or replace faulty parts if needed .
- Reinstall the Skid Plate and Pedals: Put the skid plate, brake pedal, and right foot peg back in place, tightening all bolts to the correct torque .
Important Call-outs for the 1981 Honda XR500
- Oil System Variation: The 1981 XR500 can be either a wet sump or dry sump, depending on the specific sub-model. Most 1981 XR500s are wet sump (oil contained within the engine), but some variants–including earlier or “R” models–were dry sump and require draining from both the engine and the frame. Identify your bike type by looking for an oil dipstick and cap on the frame in front of the gas tank. If present, your model is dry sump and needs oil drained from the frame as well as the engine .
- No Paper Oil Filter: This engine uses only a mesh screen; there is no replaceable oil filter. Clean the screen every oil change for proper engine protection .
- Frequent Oil Changes Advised: Because there’s no traditional filter, it’s critical to change oil more often than modern engines. Follow your manual’s interval–typically every 360 miles during break-in and every 1,600 miles for regular service .
- Gasket Integrity: Inspect crankcase cover and drain plug gaskets every oil change to prevent leaks. Replace as needed .
- Oil Quantity and Type: Do not overfill; check with the dipstick several minutes after filling, while the bike is upright. Use high-quality 4-stroke motorcycle oil for best results .
- Tightening Sequence: Always torque bolts to manufacturer spec, especially the crankcase cover and drain plug, to avoid stripping threads or causing leaks .
MotoSport.com Tip
Keeping your 1981 XR500 running at its legendary potential depends on diligent oil change routines. Always inspect for oil leaks after each change and ride with confidence, knowing that your air-cooled Honda is filled with fresh, clean oil.
For more OEM parts, maintenance products, and advice tailored to vintage Honda motorcycles, visit MotoSport.com — your trusted source for dirt bike expertise.
Related Shopping Categories
Shop Motor Oil for a 1981 Honda XR500 Dirt Bike.
Shop Oil Filters for a 1981 Honda XR500 Dirt Bike.
Shop Oil Drain Pans for a 1981 Honda XR500 Dirt Bike.
Shop Tools for a 1981 Honda XR500 Dirt Bike.
Shop Oil Fillers and Drain Plugs for a 1981 Honda XR500 Dirt Bike.
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.