How to Change the Oil in a 1999 Honda CR250: The MotoSport.com Guide

Shop parts for a 1999 Honda CR250 Dirt Bike.

Changing the oil in your 1999 Honda CR250 is an essential maintenance task that keeps your bike running smoothly and helps prevent transmission wear. This step-by-step MotoSport.com how-to blog will cover every aspect of changing the gear oil on this classic 2-stroke dirt bike, including all tools, materials, specific model tips, and best practices to keep your CR250 running strong.

Tools & Supplies Needed

  • Drain pan (to catch old oil)
  • 17mm socket (for drain bolt)
  • 10mm socket (for oil check bolt)
  • Socket wrench
  • Rubber gloves (recommended for cleanliness)
  • Rags or shop towels
  • Funnel
  • Measuring cup (a Ratio Rite cup is perfect)
  • Appropriate transmission oil: Maxima MTL Transmission Lube, Pro Honda HP Trans Oil, or 10w-40 motor oil that meets SF/SG rating

Recommended Oil Quantity and Type for 1999 Honda CR250

  • Oil capacity (at change): 750 ml (0.8 US qt)
  • Oil type: Honda GN4 10w-40, Pro Honda HP Trans Oil, or equivalent 10w-40 oil

Step-by-Step Instructions

  1. Warm Up the Engine
    • Start the bike and let it idle for 2-3 minutes. This helps thin the oil for easier and more complete draining.
  2. Position the Bike
    • Place the bike on a stable stand. Slide your drain pan under the engine.
  3. Remove the Drain Plug
    • Locate the 17mm drain bolt on the left side under the crankcase.
    • Wear gloves, use your socket wrench to loosen and remove the bolt. Allow all oil to drain.
    • If you're meticulous: Carefully tip the bike from side to side to ensure all old oil escapes if your surface is stable and safe to do so.
  4. Remove the Fill Cap
    • Remove the oil filler cap (behind the shifter) for better flow and drainage.
  5. Inspect & Clean the Bolts
    • Wipe the drain bolt and area around it. Inspect for any metal in the oil or on the bolt's magnet–minor glitter is normal, but chunks indicate issues.
  6. Reinstall the Drain Bolt
    • Replace the drain bolt. Do not over-tighten–just snug. Over-tightening may strip the engine case threads, which is costly to repair.
  7. Add New Transmission Oil
    • Measure out 750 ml using your measuring cup. Use a funnel to pour the new oil into the fill port.
    • Double-check the oil specification on your product label. Honda recommends 10w-40 weight, and many riders prefer Maxima MTL or Pro Honda HP due to positive shifting feel and protection.
    • Replace the fill cap.
  8. Check Oil Level
    • To verify correct oil level, start and run the engine for 1-2 minutes.
    • Stop the engine, remove the small oil-level check bolt (10mm) on the right side case. If oil dribbles out slightly, level is correct. If not, add oil gradually until it does.
  9. Dispose of Used Oil Responsibly
    • Transfer the old oil to a sealed container and take it to a recycling facility or trusted motorcycle shop.

Important Model-Specific Tips for the 1999 Honda CR250

  • Oil Contamination: The 1999 CR250 uses aluminum clutch drive plates, which are known to contaminate gearbox oil quickly. It is best practice to change your oil after every few hard rides or anytime clutch feel deteriorates. Fresh oil keeps shifting crisp and extends transmission life.
  • Thread Care: Be extremely careful not to over-tighten the drain bolt. The engine case threads are soft aluminum and can strip easily, especially on a 25+ year-old engine.
  • Preferred Oil: Many racers and mechanics recommend Maxima MTL or Honda GN4 10w-40 for superior protection, especially at higher temperatures and stress.
  • Oil Level Bolt: Always use the supplied oil-level check bolt to confirm you are not over- or under-filling the gearbox; having the correct level is crucial for performance and longevity.
  • Routine Maintenance: Frequent oil checks and changes help offset the higher clutch debris and tight gear meshing in this specific CR250 year block.

Safety and Final Thoughts

  • Always allow the engine to cool slightly before working around hot exhaust or cases.
  • Wear gloves to reduce direct skin contact with used engine oil.
  • Changing oil is quick and easy—typically 15 minutes—and is critical for your Honda’s long-term health. Make it a ritual after every few rides or whenever you have a clutch-service interval.

By following these steps, you’ll keep your 1999 Honda CR250 in top racing condition and protect one of the most iconic 2-stroke engines ever built. For factory parts, premium lubricants, and more CR250 resources, trust MotoSport.com for all your dirt bike needs.

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Shop Oil Fillers and Drain Plugs for a 1999 Honda CR250 Dirt Bike.

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.