How to Change the Oil in a 2009 Husqvarna CR125

Shop parts for a 2009 Husqvarna CR125 Dirt Bike.

Properly changing the transmission (gearbox) oil in your 2009 Husqvarna CR125 is one of the most crucial regular maintenance tasks and helps ensure maximum performance and longevity from your dirt bike. This guide, proprietary to MotoSport.com, provides a clear, step-by-step process for a safe and thorough oil change, highlights the tools you'll need, and points out key model-specific notes for owners of this legendary 2-stroke.

Tools and Supplies Needed

  • Metric socket set (including 13mm and 17mm sockets and wrenches)
  • Torque wrench (measuring at least up to 20 Nm)
  • Drain pan
  • Oil funnel
  • Fresh gearbox oil: Most owners use a quality 10W30 or 15W/50 4-stroke engine oil or transmission fluid (Husqvarna recommends 15W/50; check your manual for confirmation)
  • Measuring cup or graduated container (to measure out 800ml of oil)
  • Replacement crush washer for the drain bolt (recommended, not always required)
  • Rags/shop towels for cleanup
  • Parts tray for bolts
  • Disposable gloves (optional, but helps keep hands clean)

Step-By-Step Oil Change Process

  1. Warm up the engine
    • Start the motorcycle and let it idle for 3-5 minutes. This warms the oil, helping it drain more thoroughly and carry out debris.
    • Shut the engine off and let it rest for 2-3 minutes.
  2. Stabilize the bike
    • Place the bike on a stand so it sits upright and stable.
    • Clean the area around the drain plug and filler cap to prevent contamination.
  3. Remove the oil filler cap
    • Locate the oil filler cap on the right side of the engine case. Unscrew and set aside on a clean towel.
  4. Drain the old oil
    • Place the drain pan under the gearbox drain bolt. The CR125 drain plug is on the bottom of the left side of the crankcase.
    • Carefully loosen and remove the drain bolt with your wrench. Allow the oil to drain completely. Tilt the bike gently if needed to get the last bit out.
    • Inspect the drain bolt—many are magnetic, so check for metal debris.
  5. Clean and inspect components
    • Clean the drain bolt thoroughly. Replace the crush washer if it is damaged or overly compressed.
    • Wipe down any oil spillage on the engine and floor.
  6. Reinstall the drain plug
    • Thread the drain bolt in by hand to avoid cross-threading, then tighten to factory torque: 20 Nm (14.8 lbf-ft).
  7. Add new oil
    • Using your funnel, pour in 800 ml (0.8 L) of fresh transmission oil recommended by Husqvarna (usually 15W/50, but 10W30 is also commonly used and accepted)
    • Pour slowly to avoid overfilling.
    • Replace and hand-tighten the oil filler cap.
  8. Check for leaks – verify oil level
    • Start the bike and let it idle for 1 minute. Shut off and check around drain bolt and filler cap for leaks.
    • If your bike has an oil level check bolt, you can briefly remove it to confirm oil level (consult manual for location).
  9. Dispose of old oil responsibly
    • Pour old oil into a sealed container. Never pour used oil down the drain. Take it to an approved recycling center or motorcycle dealer.

Special 2009 Husqvarna CR125 Model Notes

  • Gearbox Oil Volume: The correct fill is 800 ml (0.8 liters). Do not overfill; excess oil can cause foaming and clutch drag, leading to shifting problems and premature wear (confirmed by Husqvarna owner documentation and forums).
  • Drain Plug Torque: Always torque the drain bolt to 20 Nm (14.8 lbf-ft) to avoid leaks and case damage.
  • Oil Type: Use a quality gearbox/transmission oil–preferably 15W/50 or a trusted synthetic alternative for high-stress riding. Products marketed as “2T gearbox” oil or performance 4-stroke engine oils (not premix.) are also suitable.
  • No Oil Filter: The 2009 CR125 does not have a replaceable oil filter–just change the oil at the recommended intervals, especially after severe riding or races.
  • Check Magnet: Your drain bolt likely has a magnet. Always check and clean it for metal shavings at every oil change. A significant amount of metal may indicate a transmission issue.

Pro Tips for Longevity and Performance

  • Change the gearbox oil at least every 10-15 hours of riding (more often for race use).
  • If you see milk-colored (milky) oil, inspect your water pump seal; coolant may be contaminating the oil.
  • Always keep a log of service dates and hours since the last oil change.

Regular transmission oil changes on your 2009 Husqvarna CR125 are essential for maximizing your dirt bike’s reliability, clutch life, and shifting performance. MotoSport.com recommends not skipping this crucial maintenance—every ride starts with confidence when your gearbox is protected.

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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.