How to Change the Oil in a 2006 Honda CR125

Shop parts for a 2006 Honda CR125 Dirt Bike.

Maintaining clean transmission oil in your 2006 Honda CR125 is essential for peak performance, smoother shifts, and long-term engine health. Follow this comprehensive guide from MotoSport.com for a successful oil change, including all necessary tools, step-by-step instructions, and model-specific tips.

Tools and Supplies Needed

  • 17mm socket or wrench (for the transmission drain bolt)
  • Oil drain pan
  • Measuring cup or graduated container (recommended: metric markings)
  • Clean rag or shop towel
  • Replacement transmission oil (Honda recommends 0.60 US qt or 0.57 L of a high-quality 2-stroke transmission oil)
  • Funnel
  • Torque wrench (optional, for precise reinstallation of bolts)
  • Replacement aluminum sealing washer (recommended if the existing washer is crushed or damaged)
  • Gloves (optional, for cleanliness and safety)

Preparation Steps

  • Start the engine and let it run for 1-3 minutes. This warms up the oil, allowing it to drain faster and carry out more contaminants.
  • Shut the engine off and place the bike upright on a level surface or a triangle stand.

Step-by-Step Oil Change Process

  1. Remove the Oil Filler Cap
    • Unscrew the oil filler cap located on the right side of the engine.
  2. Position the Drain Pan
    • Place your drain pan under the engine, directly below the transmission drain bolt.
  3. Remove the Transmission Drain Bolt
    • Using the 17mm socket, carefully remove the drain bolt beneath the right crankcase cover.
    • Allow all the oil to fully drain into your pan.
    • Watch for the aluminum sealing washer. Replace it if crushed or damaged (for optimal sealing).
  4. Inspect Old Oil
    • Check the drained oil for any grayish tint (common due to clutch fibers), excessive debris, or metal shavings. If you notice abnormalities, monitor more closely and consider servicing the clutch or transmission if problems persist.
  5. Reinstall the Drain Bolt
    • Clean the area and thread, then reinstall the drain bolt with its washer.
    • If using a torque wrench, tighten to 7 lbf·ft (10 N·m) as specified by Honda.
  6. Add New Oil
    • Using a funnel, slowly pour 0.60 US qt (0.57 L) of recommended transmission oil into the filler hole.
  7. Check Oil Level
    • With the bike upright, remove the oil check bolt from the right crankcase cover. Oil should barely trickle out. If not, add oil until it does.
    • Reinstall and tighten both the check bolt and the filler cap securely.
  8. Clean Up and Dispose of Oil Properly
    • Wipe up any spills and properly dispose of used oil at a recycling center or automotive shop.

Model-Specific Tips and Callouts for the 2006 Honda CR125

  • The 2006 CR125 shares the same basic transmission oil change process as previous CR125 models, making guides from 1999-2005 broadly applicable.
  • Honda specifies 0.60 US qt (0.57L) oil capacity after an oil change. Overfilling can cause excess pressure and leaks; underfilling will compromise lubrication and shifting.
  • The oil drain and check bolts are found on the right side crankcase cover; use care during removal and reinstallation to avoid stripping threads.
  • An oil with a gray tint is normal from clutch plate fibers. However, if you notice metallic particles, investigate for internal wear.
  • No oil filter is present on this two-stroke—just replace oil at regular intervals for maximal protection.

When to Change Your Transmission Oil

  • Honda recommends changing the transmission oil every 10 hours of riding or after aggressive sessions/races.
  • Always check your owner’s manual for interval recommendations based on riding intensity and conditions.

Final Checks

  • Confirm proper oil level using the check bolt method after the bike has rested for a few minutes.
  • Tighten all bolts to recommended torque to avoid leaks.
  • Dispose of your used oil responsibly—never pour it down drains or onto the ground.

Keeping up with regular transmission oil changes on your 2006 Honda CR125 ensures smoother power delivery, fewer breakdowns, and long-lasting fun on the track or trail.

MotoSport.com is your trusted source for OEM and aftermarket parts, tools, and fluids—everything you need to keep your ride in top shape.

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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.