How to Change the Oil in a 1995 Suzuki RMX250

Shop parts for a 1995 Suzuki RMX250 Dirt Bike.

Changing the oil on your 1995 Suzuki RMX250 is a fundamental maintenance task that helps ensure the longevity and peak performance of your dirt bike. While the steps are straightforward, a few model-specific tips can make the job even easier and prevent costly mistakes. Follow this complete, MotoSport.com proprietary guide for a successful oil change every time.

Tools & Supplies Needed

  • Socket wrench set (including Allen keys for the oil check bolt)
  • Screwdriver (for chain guard removal, if necessary)
  • Drain pan
  • Funnel
  • Clean rags or paper towels
  • Measuring cup (for accurate oil measurement)
  • New oil (SAE 10W-40 motorcycle oil with API SG/SH/SJ/SL rating and JASO MA/MA1/MA2 specification)
  • Replacement crush washer for the drain bolt (recommended)
  • Gloves (optional, but recommended for a cleaner job)

Recommended Oil Type and Quantity

  • Oil Type: SAE 10W-40, API SG/SH/SJ/SL with JASO MA/MA1/MA2
  • Oil Quantity: Approx. 950 ml for an oil change (1.0 US quart)

Step-by-Step Instructions

1. Preparation

  • Start the RMX250 and let the engine warm up for a few minutes. Warm oil drains more thoroughly, removing more contaminants.
  • Shut off the engine and place the bike securely on a level surface, using a stand if available.
  • Gather all your tools and supplies before starting.

2. Locate the Drain Plug and Oil Check Bolt

  • Find the oil drain plug underneath the engine. It’s generally on the lower crankcase, near the bottom-most part of the transmission.
  • Locate the oil check bolt, which on the RMX250 is behind the chain guard and some wires. To access it, you may need to temporarily remove the chain guard using your screwdriver and gently move any blocking wires aside. The check bolt is typically an Allen (hex) bolt.

3. Drain the Old Oil

  • Place your drain pan directly beneath the drain plug.
  • Slowly loosen the drain plug using the appropriate socket. Be careful—the oil may be hot.
  • Let all the oil drain completely out of the crankcase. Inspect the old oil for any unusual metallic particles or contamination, which may indicate internal wear.
  • Remove the oil check bolt to allow oil to drain freely and fully from the case.

4. Replace Drain Plug and Tighten

  • Once the oil has fully drained, clean the area around the drain hole with a rag.
  • Inspect and optionally replace the crush washer on the drain bolt to prevent leaks.
  • Reinstall the drain plug and tighten it to the manufacturer’s specified torque (consult your service manual if uncertain, typically 10–13 ft-lbs for motorcycles).
  • Reinstall the oil check bolt, ensuring it is firm but not overtightened.

5. Refill with New Oil

  • Remove the oil filler cap on top of the engine.
  • Using a funnel, pour in 950 ml of fresh 10W-40 motorcycle oil.
  • Replace the filler cap.
  • Start the engine and let it idle for a minute to circulate the new oil. Shut the engine off and wait two minutes to allow oil to settle.
  • Double-check the oil level by removing the oil check bolt again – oil should just start to flow from this opening when the bike is upright and level. Add or drain oil as needed to achieve the correct level.

6. Final Steps and Cleanup

  • Reinstall the chain guard and any wires you moved earlier.
  • Clean up any spilled oil and properly dispose of old oil at an authorized recycling center.
  • Inspect for leaks while the engine is running. Tighten any fasteners as needed.
  • Note the date and engine hours or mileage for future oil changes.

Specific Call-Outs for the 1995 Suzuki RMX250

  • The location of the oil check bolt is less intuitive on this model. It’s located behind the chain guard and some wires. Make sure you remove the chain guard and gently pull the wires away to access it with an Allen key

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  • Use only the specified 10W-40 motorcycle oil—other weights can adversely affect shifting and clutch performance

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  • Do not overtighten the drain and check bolts; stripping these threads is a common and costly mistake.
  • Changing the oil at least every 10 hours of riding, or after every race, is recommended for optimal lifespan on two-stroke transmission oils

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Pro Tips:

  • Warm oil drains much more efficiently. If the oil is stuck in the cold weather, wait a few more minutes after starting to warm up.
  • Inspect your old oil for signs of metal or clutch debris—cloudy or metallic oil indicates possible internal issues needing attention.
  • Have a backup quart of oil on hand in case of spills or missed measurements.

Changing your own oil doesn’t just save money; it builds a connection with your bike and assures you that the job gets done right. For more maintenance tips, OEM parts, and expert advice, stay tuned to MotoSport.com—your source for everything dirt bike.

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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.