How to Change the Oil in a 1993 Honda CR250

Shop parts for a 1993 Honda CR250 Dirt Bike.

Regular oil changes are crucial for optimal performance and longevity of your 1993 Honda CR250. Below is a step-by-step, proprietary MotoSport.com guide to ensure you get the process right, every time. This guide covers all required tools, detailed instructions, and specific notes for this iconic two-stroke dirt bike.

Tools and Supplies Needed

  • Drain pan
  • Rubber gloves
  • 17mm socket or wrench (drain bolt)
  • 10mm socket or wrench (fill cap and check bolt)
  • Clean rag
  • New transmission oil (Recommended: 10W-40, such as Maxima MTL)
  • Measuring cup (Ratio Rite or similar; measure in cc/ml)
  • Funnel
  • Torque wrench (for reinstalling bolts)

Step-by-Step Oil Change Instructions

  1. Warm up your engine:
    • Start the bike and let it idle for a few minutes. Warm oil flows better and helps contaminants leave the bottom end during draining.
  2. Prepare your work area and gather tools:
    • Set the bike upright on a stand. Lay down rags if working indoors to catch any spills.
  3. Remove the oil filler cap:
    • The filler cap is located on the right-hand crankcase cover. Removing it allows oil to drain freely without pressure build-up.
  4. Drain the old oil:
    • Slide the drain pan under the bike.
    • Use the 17mm socket to remove the drain bolt at the bottom of the engine case.
    • Allow oil to fully drain. For a complete and rapid draining, wait a few extra minutes, tilting the bike slightly if needed to get every last drop out.
  5. Clean and reinstall the drain bolt:
    • Wipe the bolt and drain hole with a clean rag before reinstalling to prevent contamination.
    • Thread the drain bolt back in by hand, then tighten it with the socket. Do not overtighten. The aluminum case strips easily. Recommended torque: 8-12 N-m (6-9 ft-lb).
  6. Fill with new oil:
    • Measure 650cc (0.65 liters, 0.69 quarts) of transmission oil. This is the recommended capacity for a 1993 CR250.
    • Use the funnel to pour the oil into the filler hole.
    • Most owners and manuals suggest using a high-quality 10W-40 motorcycle-specific transmission oil. Maxima MTL or AMSOIL synthetic are excellent choices for performance and clutch life.
  7. Check the oil level:
    • Locate the oil level check bolt on the right side of the case (usually 10mm).
    • Remove the check bolt; a small amount of oil should dribble out. If not, add oil slowly until it does.
    • Once satisfied, reinstall the check bolt and tighten securely but gently (do not overtighten; the case threads are soft).
  8. Reinstall the fill cap:
    • Clean the area and thread the fill cap back on by hand. Tighten snugly.
  9. Final inspection and start-up:
    • Wipe down any spilled oil from the crankcase area.
    • Start the bike and let it run for a few minutes. Shut it down, let oil settle, and recheck the level via the check bolt. Top off if necessary.

Important 1993 Honda CR250-Specific Notes

  • Oil Type & Capacity: The 1993 CR250 is a two-stroke, and the oil being replaced here is for the transmission/clutch only, not the main engine (which runs premix). Use 10W-40 motorcycle-specific transmission oil, 650cc at each change. Overfilling can cause clutch drag and foaming.
  • Drain Plug Caution: The drain plug threads in the crankcase are soft. Always use a torque wrench and never overtighten to avoid expensive repairs.
  • Service Interval: As a high-performance two-stroke meant for motocross, change oil after every third race event or every 7.5 hours of riding for best performance and clutch life.
  • Oil Disposal: Used oil must be collected and taken to a recycling facility to protect the environment. Prolonged skin exposure to used oil can be hazardous. Always use gloves and wash up after working with used oil.
  • Case Material: The engine case is aluminum. Take extra care with all bolts to avoid cross-threading or over-tightening.

Summary

  • Changing the oil in your 1993 Honda CR250 is straightforward with the right tools and attention to torque specs.
  • Use high-quality 10W-40 transmission oil, measure out 650cc, and never overtighten drain and check bolts.
  • Stay current with oil changes for maximum clutch and gearbox life—your CR250 and your riding performance will thank you.

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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.