How to Change the Oil in a 1987 Suzuki RM250

Shop parts for a 1987 Suzuki RM250 Dirt Bike.

Changing the oil in your 1987 Suzuki RM250 is an essential part of regular maintenance that keeps your two-stroke dirt bike running smoothly. Although the 1987 RM250 is a vintage model, its oil change procedure remains similar to recent RM250s, with some specific call-outs noted below. This guide is proprietary to MotoSport.com and walks you through the entire process, from preparation to completion, with attention to model-specific needs.

Tools and Materials Needed

  • Socket set (including 8mm, 10mm, and 12mm sockets)
  • Allen wrenches (check for the correct size for the oil check bolt, usually 5mm or 6mm)
  • Oil drain pan
  • Rags or paper towels
  • Funnel
  • Fresh oil (SAE 10W-40 or SAE 20W/40 for vintage models)
  • Rear stand or way to level the bike
  • Torque wrench
  • Replacement crush washer for the drain bolt (recommended)
  • Parts cleaning spray (optional for cleaning area around drain plug)
  • Owner's manual (for torque specs and extra reference, if available)

Step-by-Step Instructions

  1. Warm Up the Engine
    • Start the bike and let it idle for 2-3 minutes. This helps thin the oil so it drains out fully and brings any debris into suspension for removal.
  2. Secure the Bike
    • Place the RM250 on a stand on a level surface. Ensure it stands vertically for proper drainage and refill accuracy.
  3. Locate and Remove the Filler Cap
    • The oil filler cap is located on the right (kickstarter) side of the engine. Unscrew and set it aside; this allows oil to drain smoothly by preventing a vacuum.
  4. Find and Remove the Drain Plug
    • The transmission oil drain plug is on the underside of the engine. Use a socket or box-end wrench (usually 12mm or 14mm) to loosen it. Hold the oil drain pan beneath to catch the used oil.
    • Remove the drain bolt and the crush washer. Allow oil to drain completely–this may take several minutes.
  5. Inspect and Clean Components
    • Inspect the drain bolt and especially the washer. Replace the washer if damaged or flattened to prevent leaks.
    • Wipe away any dirt or debris from around the drain and filler to avoid contaminating the transmission.
  6. Reinstall the Drain Plug
    • Once oil stops dripping, install a new crush washer onto the bolt and rethread the drain plug by hand. Tighten with a torque wrench to 21 N·m (15 lb-ft) (per RM250 manual) for a secure, leak-free fit

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  7. Add Fresh Oil
    • Using a funnel, slowly pour in the correct amount of fresh oil:
    • Recommended capacity for 1987 RM250: 750 ml (0.8 US qt) for a standard oil change

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    • Use SAE 10W-40 or SAE 20W/40 transmission oil, per Suzuki specs for this era

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  8. Check Oil Level
    • The RM250 sports a check bolt on the right crankcase cover. To access, you may need to temporarily move or remove the chain guard. Use the appropriate size Allen key to take out the check bolt.
    • Once oil is added, with the bike upright, let oil settle for a minute. Oil should just trickle out of the check bolt hole, confirming the level is correct

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    • If nothing comes out, add small amounts until you see oil at the bolt. If too much pours out, wait until it subsides to a trickle and then install the bolt.
    • Reinstall the check bolt and tighten gently.
  9. Replace Filler Cap and Wipe Down
    • Screw the filler cap back on securely.
    • Wipe any spilled oil from the engine and frame to prevent dirt buildup and maintain safety.
  10. Dispose of Used Oil Properly
    • Transfer used oil to a sealed container and take it to a recycling facility or an auto parts store that accepts oil. Never dump oil on the ground or in drains.

Model-Specific Call-Outs for the 1987 Suzuki RM250

  • Check Bolt Location: On the 1987 RM250 (like other years), the oil check bolt can be hidden behind the wiring harness and possibly the chain guard. Don’t overlook this; it’s essential for accurate oil measurement

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  • Oil Capacity: Some vintage service manuals list slightly higher fill amounts (up to 900ml) for overhauls, but 750ml for a change is correct for routine maintenance

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  • Oil Type: Suzuki specifies SAE 10W-40 or 20W/40 transmission oil for the RM250. Modern synthetic 10W-40s are widely available and suitable.
  • Torque Specs: Be careful not to overtighten drain bolts, as vintage aluminum cases are prone to stripping threads

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Tips for Optimal Results

  • Always pre-check for oil leaks after performing maintenance; run the engine briefly and inspect the drain and check bolt areas.
  • Record the oil change date and type in a maintenance log.
  • If your RM250 is used in competition or extreme conditions, inspect and change the oil more frequently.
  • Always use a new crush washer to avoid leaks.

Changing the transmission oil in your 1987 Suzuki RM250 ensures longevity and performance, keeping this classic two-stroke ready for the track or trail. For more parts, oils, and dirt bike essentials, visit MotoSport.com—your home for expert powersports support.

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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.