How to Change the Oil in a 1990 Honda CR250

Shop parts for a 1990 Honda CR250 Dirt Bike.

Regular oil changes are vital to ensure the longevity and peak performance of your 1990 Honda CR250's transmission. This step-by-step guide, proprietary to MotoSport.com, covers every tool you need and highlights important model-specific tips to get the job done right.

Tools & Supplies Needed

  • 17mm socket (for drain bolt)
  • 10mm socket (for check bolt)
  • Socket wrench with extension
  • Drain pan
  • Rubber gloves (recommended for cleanliness and safety)
  • Funnel
  • Measuring cup (such as a Ratio Rite)
  • Clean rags
  • Maxima MTL 80W or equivalent transmission oil (Honda recommends 10W-40 4-stroke motorcycle oil, but Maxima MTL or similar products are trusted choices for two-stroke transmissions.)
  • Torque wrench (for correct bolt tightening)

Pre-Change Preparation

  • Warm the bike up: Start your CR250 and let it idle for 3-5 minutes. Warm oil drains more thoroughly, removing more contaminants and sludge.
    Tip: Do not rev hard; you only want to get the transmission oil lukewarm, not hot.
  • Stabilize the bike: Use a bike stand to keep the CR250 upright and level throughout the process.

Step-by-Step Oil Change Process

  1. Remove the filler cap (located on the right crankcase cover) to allow air in and help the oil drain smoothly.
    Model tip: The 1990 CR250 uses a screw-type oil filler cap.
  2. Position your drain pan under the engine, directly beneath the transmission drain bolt.
  3. Remove the drain bolt with your 17mm socket. Let the old oil drain completely.
    Caution: Oil can be carcinogenic if left on skin for prolonged periods. Wear gloves and avoid contact as much as possible.
    Note: Warm oil drains faster and more completely. Wait until the flow has slowed to dripping.
    1990 CR250 specific: The case and bolt threads are aluminum, so avoid over-tightening to prevent stripping.
  4. Inspect and clean the drain bolt and sealing washer. Wipe away any metallic debris. Replace the washer if damaged.
  5. Reinstall the drain bolt by hand, then torque to 8–12 N·m (6–9 ft-lb). Overtightening can strip the threads or crack the case.
  6. Add fresh oil:
    • 1990 CR250 recommended capacity: 0.7 liters (700 ml) of transmission oil.
    • Use a measuring cup (like a Ratio Rite) for accuracy. Pour slowly to avoid overflow and air pockets in the clutch area.
    • Insert the funnel into the oil filler hole, pour in about 500 ml, then the remaining 200 ml slowly, working the clutch lever a bit to help distribute oil through the plates.
    • Do not pour too quickly, as it may back up through the filler opening.
  7. Oil level check:
    • Locate and remove the oil check bolt (situated midway up the clutch cover). With the bike upright, oil should start dribbling out.
    • If no oil escapes, add a small amount at a time until it does.
    • Once oil seeps out, you've hit the correct level. Reinstall and torque the check bolt to specification.
  8. Replace filler cap and wipe up any spilled oil.

Post-Change Check

  • Start and idle the engine for 2–3 minutes.
  • Re-check for leaks around the drain and check bolts.
  • Inspect oil level one more time using the check bolt after shutting the bike off and allowing oil to settle.

1990 Honda CR250 Owner Specific Call-Outs

  • Oil volume: 0.7 liters (700 ml) for each oil change.
  • Recommended oil: SAE 10W-40 (Honda GN4 or equivalent 4-stroke oil), or transmission-specific oils like Maxima MTL 80W for better clutch performance.
  • Tightening torque: 8–12 N·m (6–9 ft-lb) for both the drain and check bolts. The cases are aluminum—never overtighten.
  • Change interval: Every 3 races or 7.5 hours of running as recommended in the factory manual.
  • Clutch operation: When filling, work the clutch lever a few times to help oil coat all plates for smoother action.
  • Environmental safety: Dispose of used oil responsibly. Many auto parts stores accept used motor oil for recycling.

Conclusion

Keeping up with regular transmission oil changes on your 1990 Honda CR250 is one of the simplest ways to ensure your dirt bike remains reliable through every ride. Always choose high-quality oil and follow Honda's specifications for volume and torque to protect your investment.

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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.