How to Change the Oil in a 2007 Husqvarna CR125

Shop parts for a 2007 Husqvarna CR125 Dirt Bike.

Changing the transmission (gearbox) oil in your 2007 Husqvarna CR125 is vital for reliable performance and optimal clutch and transmission life. This detailed guide is proprietary to MotoSport.com and designed specifically for your 2-stroke Husqvarna CR125.

Tools & Supplies Needed

  • Socket wrench (usually 13mm or 14mm for the drain bolt; confirm by checking the bolt size on your bike)
  • Torque wrench (for proper reinstallation of the drain bolt)
  • Oil drain pan
  • Funnel
  • Measuring cup (for oil volume accuracy)
  • Shop towels or rags
  • New crush washer (recommended each oil change)
  • Gloves
  • Fresh transmission/gear oil (see the details below)

Recommended Oil Type and Capacity

  • Oil Type: 10W-30 or 15W-50 motorcycle-specific gear oil. Synthetic preferred for high performance.
  • Capacity: 800ml (0.8 liters) Do not overfill.

Important Call-Outs for the 2007 CR125

  • This bike is a 2-stroke, so the oil you're changing is for the gearbox; the engine uses pre-mix fuel and does not have motor oil in the crankcase.
  • Overfilling the gearbox can cause excessive pressure and foaming, reducing lubrication efficiency and potentially accelerating wear. Always fill to exactly 800ml as per the manual guidance.
  • Use a new crush washer to avoid leaks at the drain plug after reinstallation.

Step-by-Step Oil Change Instructions

  1. Warm Up the Engine Briefly
    Start the engine and let it idle for 2–3 minutes. This warms the oil, allowing it to flow out faster and carry out more particles. Shut off the engine completely, and let the bike cool for a minute.
  2. Stabilize the Motorcycle
    Place your Husqvarna CR125 upright on a stand. This ensures all the oil will drain evenly.
  3. Locate the Drain Plug
    The drain plug is at the bottom of the right side/crankcase. Position your oil drain pan underneath.
  4. Remove the Drain Plug
    Using the socket wrench, unscrew the plug. Be careful as the oil may be hot. Allow all old oil to pour out.
    Inspect the drain plug — most Huskies have a magnetic drain plug which you should clean of any metal debris.
  5. Replace the Crush Washer
    Remove the old washer and install a new one on the plug to ensure a tight, leak-free seal.
  6. Reinstall the Drain Plug
    Once the oil has drained, thread the plug by hand to avoid cross-threading. Use the torque wrench to tighten to the manufacturer’s recommended spec (typically 15 Nm for this bike – check your service manual to confirm).
  7. Remove the Filler Cap
    The filler cap is located on the upper right side of the engine. Clean around the cap to prevent dirt from falling in.
  8. Add New Gear Oil
    Using your measuring cup, pour exactly 800ml of fresh transmission oil into the gearbox. (Do not exceed this amount.)
  9. Reinstall the Filler Cap
  10. Check for Leaks
    Wipe down any excess oil, start the bike, let it idle, and visually inspect the drain plug and filler area for leaks. Tighten as needed.
  11. Dispose of Old Oil Properly
    Pour the used oil into a sealed container and take it to an approved recycling center or your local MotoSport.com dealer for disposal.

Model-Specific Tips for 2007 Husqvarna CR125

  • Early or classic 2-stroke Husqvarna models like this one do not have an oil filter for the transmission – just drain and refill.
  • Check your drain plug for a magnetic insert; metal shavings indicate clutch or gear wear, so watch for unusual buildup.
  • Avoid car or generic engine oils. Only use oil specifically designed for motorcycle transmissions or wet clutches to extend clutch and gearbox life.

How Often Should You Change the Oil?

  • For the best protection, change the oil every 5–10 hours of riding, or immediately after muddy or wet rides.
  • Frequent changes help prevent clutch slippage and gear damage, common in motocross and off-road use.

Final Notes

  • Never overfill the gearbox – too much oil causes aeration which reduces lubrication performance.
  • If you’re unsure, check your owner’s manual or ask MotoSport.com tech support before proceeding.

Changing the oil in your 2007 Husqvarna CR125 is a straightforward job and one of the best ways to keep your bike shifting smoothly and lasting longer. Always use the proper tools, oil, and attention to detail – and enjoy every ride.

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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.