How to Change the Oil in a 1997 Honda CR250

Shop parts for a 1997 Honda CR250 Dirt Bike.

Changing the transmission oil on your 1997 Honda CR250 is a straightforward maintenance task that can significantly improve your bike's shifting performance and longevity. Below you'll find a detailed, MotoSport.com-proprietary guide outlining the tools required, step-by-step instructions, and specific tips for this legendary two-stroke dirt bike.

Tools and Supplies Needed

  • 17mm socket (for the drain bolt)
  • 10mm socket or wrench (for the oil check and fill bolt)
  • Drain pan
  • Funnel
  • Oil measuring cup (e.g., Ratio Rite)
  • Clean rag
  • Gloves (recommended)
  • Replacement copper washer (optional, but recommended if the current one is damaged or missing)
  • High-quality gear oil (Honda recommends Pro Honda HP trans oil or 10W-40 GN4 4-stroke oil, 750 ml capacity for an oil change)

Preparations and Model-Specific Callouts

  • The 1997 CR250 uses separate transmission oil; do not put engine two-stroke premix in the transmission.
  • The oil drain plug is equipped with a copper washer. Always check for this washer, as it prevents leaks. Replace it if worn or missing.
  • Transmission oil capacity is 750 ml (about 0.8 quarts) for a standard oil change, but always check the level as described below.
  • Use 10W-40 SF/SG engine oil or equivalent gear oil; avoid ATF or non-recommended fluids.

Step-by-Step Oil Change Instructions

  1. Warm up your bike
    • Start the CR250 and let it idle for 2–3 minutes. This thins the oil and helps it drain more thoroughly.
  2. Locate oil drain and fill bolts
    • The drain bolt is typically on the left lower side of the crankcase, often with a 17mm head and a copper washer.
    • The fill cap is usually on the clutch cover's upper side. The oil check bolt (10mm, often with a copper washer) is on the side cover, slightly to the right of the Honda logo.
  3. Drain the old oil
    • Position a drain pan directly beneath the drain bolt.
    • Remove the drain bolt using a 17mm socket.
    • Remove the fill cap to help oil drain faster and more evenly.
    • Allow all oil to completely drain out. Inspect the drain bolt for metal debris and wipe clean; replace the copper washer if damaged.
  4. Reinstall the drain bolt
    • Once all oil has drained, reinstall the drain bolt with the copper washer. Hand-tighten, then snug with a socket—do not over-tighten, as the aluminum cases can strip easily.
  5. Add new oil
    • Measure out 750 ml of transmission oil in a suitable cup (such as a Ratio Rite).
    • Place the funnel in the fill opening and pour in the oil.
    • Replace the fill cap.
  6. Verify the oil level (Honda-specific method)
    • With the bike level, remove the 10mm check bolt on the side case.
    • Oil should just begin to seep from this opening when the level is correct.
    • If oil does not flow out, add a small amount until it does. Reinstall the check bolt snugly.
    • Start the bike for a minute, shut off, let settle, and recheck if needed.
  7. Final steps
    • Wipe up any spilled oil, ensure all bolts are snug, and dispose of your old oil responsibly, per your local regulations.
    • Check for leaks after the first ride.

Additional Tips for the 1997 CR250

  • Always use a new copper washer if the old one is crushed or damaged, as this will prevent annoying leaks.
  • Never overtighten bolts in the aluminum crankcase.
  • Schedule oil changes every 5–10 hours of riding for optimal clutch life and gear protection.
  • This procedure is for the transmission (gear) oil only. The engine itself gets oil via fuel/oil premix at 32:1, so do not attempt to add oil directly to the combustion chamber.

Recommended Oil Specs

  • Type: Pro Honda HP transmission oil or Pro Honda GN4 10W-40 SF/SG, or equivalent high-quality gear oil
  • Quantity (oil change): 750 ml (0.8 qt)

Changing the oil in your 1997 Honda CR250 is an essential piece of maintenance and, with the right tools and knowledge, one of the easiest. Always consult your owner's manual or MotoSport.com for additional tips and always use the highest quality oil available for best performance.

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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.