How to Change the Oil in a 1989 Suzuki RM250

Shop Parts for a 1989 Suzuki RM250 Dirt Bike.

  • Tools & Supplies Needed
    • Socket wrench (for drain bolt removal)
    • Drain pan (low profile preferred)
    • New transmission oil (SAE 10W-40 or MTL 80W, non-synthetic preferred for older models)
    • Funnel
    • Ratio Rite cup or similar measuring cup
    • Shop rags/paper towels
    • Allen key set (for oil check bolt)
    • Goggles and gloves (for protection)

Step-by-Step Instructions

  1. Warm Up the Engine
    Start the engine and let it idle for a few minutes. Warming up the engine helps thin the oil, so it drains out more thoroughly.
    Tip: Do not let the bike get too hot–just warm enough to feel the clutch cover is warm to the touch.
    Model Callout: The 1989 RM250 is a 2-stroke and only the transmission oil is being changed, not engine oil.
    Owner Caution: Avoid burns; the exhaust will be hot.
  2. Position the Bike
    Place the bike on a level surface and keep it upright using a stand. This ensures complete oil drainage and an accurate refill.
    Specific Note: The RM250—s drain plug is on the bottom of the case, just to the right of center when facing forward.
  3. Remove the Oil Filler Cap
    Unscrew the oil filler cap located on the right side of the engine. Removing it now helps the oil flow out smoothly.
  4. Drain the Oil
    Place your drain pan under the engine—s drain plug.
    Use your socket wrench to remove the drain plug.
    Allow oil to drain completely. Tilting the bike slightly side to side at the end helps get the last drops out.
    • Drain plug torque spec: 21 N·m (2.1 kgf-m, 15.0 lb-ft)
      Be careful not to overtighten when reinstalling.
    • Special Call-Out for the 1989 Model: If you lose the crush washer on the drain plug, replace it to prevent leaks.
  5. Reinstall the Drain Plug
    Clean the drain plug and reinstall it with the proper torque. Confirm the crush washer is in good condition.
  6. Measure and Refill with Fresh Oil
    - For the 1989 RM250, add 750 ml (about 0.8 US qt) of fresh transmission oil if you are just doing an oil change.
    - Use your Ratio Rite or measuring cup to ensure accuracy. Overfilling or underfilling can cause performance issues.
    - Pour the oil in through the filler opening, using a funnel for precision.
    • Model Callout: 10W-40 four-stroke oil was specified in owner—s documentation and various sources; synthetic is not required. Gear-specific oil like Maxima MTL 80W is also a popular modern choice and may give smoother shifting.
  7. Check Oil Level
    On the 1989 RM250, there is a check bolt on the right side of the engine, behind the chain guard and some wires.
    Use an Allen key to remove it. Oil should just start to seep out when the bike is level and the oil is at the correct height.
    Specific Caution: Many owners miss this check bolt as it—s somewhat hidden; do not skip this step for an accurate fill.
  8. Replace All Caps and Clean Up
    Reinstall the oil filler cap and the oil check bolt.
    Wipe up any spilled oil, and dispose of old oil responsibly at an approved recycling center.

Model-Specific Tips and Warnings for 1989 Suzuki RM250 Owners

  • Transmission Oil Only – 2-stroke engines like the RM250 do not have separate engine crankcase oil; you are just changing the transmission/clutch oil.
  • Check for Metal Flakes – Inspect the drained oil for metallic particles. Excessive metal may indicate clutch or gear wear; consult a mechanic if noticed.
  • Always Use the Correct Amount – Overfilling can cause foaming and clutch problems. Underfilling can cause poor lubrication and costly damage.
  • Periodic Changes – For racing or hard-ridden bikes, change the oil more frequently (every 5–10 hours of riding).

Final Thoughts

  • Changing the transmission oil on your 1989 Suzuki RM250 is simple once you locate the check bolt and use the correct amount of oil.
  • Keeping your oil fresh extends the lifespan of your clutch and gears and improves shifting and overall bike performance.

This oil change guide is proprietary content for MotoSport.com.

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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.