How to Change the Oil in a 2012 Husqvarna WR300

Shop parts for a 2012 Husqvarna WR300 Dirt Bike.

Keeping your 2012 Husqvarna WR300 running smoothly requires regular transmission (gearbox) oil changes. Proper lubrication ensures a longer lifespan for your engine and smoother shifts on and off-road. This guide, proprietary to MotoSport.com, covers all you need to know for the task, including required tools, a step-by-step process, and specific notes unique to the WR300. Always consult your owner's manual for further details and safety information.

Tools & Supplies Needed

  • Socket wrench set (appropriate metric sizes, usually 13mm or 17mm for Husqvarna drain/fill plugs)
  • Drain pan (to catch old oil)
  • Measuring jug (for correct oil quantity)
  • Funnel (small, for gearbox fill port)
  • Shop towels/rags (for cleanup and wiping parts)
  • Gloves (optional, for keeping hands clean)
  • Replacement transmission oil (High quality, motorcycle-specific two-stroke gearbox oil, SAE 75W-90 or according to manual)
  • Gasket/sealing washer (new, for the drain plug, recommended)

Preparation Steps

  • Start with a warm engine. Run your WR300 for a few minutes to heat the oil – this helps it drain completely and carry out contaminants.
  • Position the bike upright on a stand. The oil drains best when the bike is level.
  • Make sure your work area is well-ventilated and protected from any sources of sparks or flames. Use a sturdy pan or bin to avoid spills.

Step-by-Step Instructions

  1. Locate all necessary components.
    • Drain plug (A): Found underneath the engine, often at the lowest point of the crankcase for optimal drainage.
    • Fill cap (B): Usually located on the right side of the engine, above the clutch cover.
    • Level screw (C): A small bolt on the side of the engine casing, used to check proper oil level.
  2. Clean the area around the drain and fill plugs with a rag to prevent foreign objects from entering the gearbox during the oil change.
  3. Place the drain pan directly below the drain plug.
  4. Remove the drain plug (A) with your wrench, allowing the old oil to flow into the pan.
    • It’s helpful to tip the bike slightly towards the drain side to ensure all oil has exited the engine and no pools remain in recesses. About a 30-degree tilt is usually sufficient, but avoid excess tipping which could spill fuel or cause damage.
    • Allow the oil to drain completely, which may take several minutes as oil warms and thins.
  5. Inspect the drain plug:
    • Check for metallic debris attached to the magnetic plug. A small amount of fine metal “paste” is normal, but larger pieces may indicate excessive internal wear.
    • Replace the sealing washer/gasket on the drain plug for best results.
  6. Reinstall the drain plug with the new washer, tightening to manufacturer-specified torque. Overtightening can strip threads.
  7. Remove the fill cap (B) on the side of the engine.
  8. Measure and pour new oil:
    • For a 2012 WR300, the specified gearbox oil capacity is 800cc (0.8L or about 0.85 US quarts). Some sources note a slight range; best practice is to pour conservatively and check the level.
    • Use a small funnel to avoid spillage. Pour oil into the fill hole.
  9. Check the oil level:
    • With the bike level, remove the side level screw (C).
    • Wait for oil to seep from the level hole; when it does, the gearbox is at the correct fill. Reinstall the screw securely.
  10. Replace the fill cap and wipe any excess oil from the casing.
  11. Run the engine briefly to circulate the new oil, then check for leaks at both plugs.
  12. Dispose of used oil responsibly. Take it to a local auto parts store or hazardous waste facility per your region’s regulations.

Special Call-Outs for the 2012 Husqvarna WR300

  • This is a two-stroke engine. The crankshaft, piston and top end are lubricated by premix in the fuel; the oil you change here is for the transmission (gearbox) and clutch only. There is no oil filter to replace in this process, making it faster than a four-stroke oil change.
  • The oil capacity is 800cc. Avoid overfilling – excessive oil can cause clutch drag and shifting issues. Use the level check screw method for accuracy.
  • Always use a motorcycle-specific gearbox/transmission oil, not regular engine oil. Gearbox oils are formulated for clutch and gear protection under high stress.
  • If you ride heavily in wet, muddy, or dusty conditions, you may need to change the oil more often. Factory interval is typically every 10–20 hours, but check the manual for recommendations based on riding style.
  • Check for leaks after every oil change and before each ride.

Final Tips and Maintenance Schedule

  • Mark the next recommended oil change on your maintenance calendar — every 10–20 hours of riding, or monthly for recreational use.
  • Inspect the gearbox drain plug for metal at each service: a noticeable increase in shavings may suggest internal wear and should prompt further inspection.
  • Review the official Husqvarna workshop or owner’s manual specific to the 2012 WR300 for manufacturer updates or changes unique to your serial number or build year.

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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.