How to Change the Oil in a 2009 Husqvarna WR300

Shop parts for a 2009 Husqvarna WR300 Dirt Bike.

Maintaining your 2009 Husqvarna WR300 is essential for optimal performance, and regular transmission oil changes are one of the most critical tasks. This comprehensive guide is proprietary to MotoSport.com and will walk you through each step, list the tools required, and highlight any specific notes relevant to your WR300.

Tools & Supplies Needed

  • Ratchet Wrench (with extension)
  • 13 mm Socket
  • Oil Drain Pan
  • Funnel
  • Oil Measuring Container (graduated for 800 ml)
  • Clean Rags or Paper Towels
  • Replacement Oil (see manufacturer specification, typically high-performance two-stroke gear oil)
  • New Drain Plug Washer/Gasket (recommended for a proper seal)
  • Gloves (optional, for cleanliness)
  • Service Stand (recommended for bike stability)

Oil Type and Quantity

  • Quantity:– 800 ml (0.8 liters) of transmission oil
  • Type:– Refer to your manual; most riders use high-quality 2-stroke gear oils

Always double-check oil spec with your Owner—s Manual or trusted mechanic before purchase. Typical complete service kits include oil, air filter, and spark plug for convenience.

Step-by-Step Guide

  1. Prep the Bike and Work Area
    • Start the engine and let it run for a few minutes so the oil warms and thins for easier draining.
    • Shut off the engine.
    • Place the bike upright and level, ideally on a service stand.
    • Set out all your tools and supplies, and place the oil pan directly underneath the oil drain plug.
  2. Draining the Old Oil
    • Locate the oil drain plug (A) underneath the engine sump. It should be visible from beneath the bike. Use a 13 mm socket and ratchet to loosen and remove this bolt carefully. Be cautious as the oil may be hot.
    • Allow the oil to completely drain into your pan. This step may take several minutes.
    • While draining, inspect the drain plug; it—s usually magnetic to catch metal shavings. Small amounts of metallic debris are normal, but look out for larger chunks or excessive metal, which can indicate internal wear. Clean the plug thoroughly before reinstalling.
    • Once drained, check and, if needed, replace the washer/gasket on the drain plug.
    • Reinstall the drain plug by hand at first, then snug it with the ratchet. Avoid over-tightening to prevent damage.
  3. Filling with New Oil
    • Locate the filling cap (B)–typically found on the right side of the engine case. Remove the cap.
    • Using a funnel, pour in 800 ml of the recommended oil type. A measuring container helps ensure accuracy.
    • Replace the filling cap securely when finished.
  4. Checking the Oil Level
    • To ensure proper fill, remove the levelling screw (C)–this is a small bolt located on the case. With the bike upright and level, oil should just start to seep out of this level check hole, indicating proper level.
    • If no oil emerges, add small amounts until it does.
    • Reinstall the level check screw and snug it gently.
  5. Clean Up and Final Checks
    • Wipe any spilled oil from the engine/case and surrounding area.
    • Dispose of the used oil responsibly at your nearest auto parts store or recycling center.
    • Start the bike, let it idle for a few minutes, then check for leaks around the drain and fill plugs.

Model-Specific Tips and Call-Outs for the 2009 Husqvarna WR300

  • The 2009 WR300 requires 0.8 liters (800 ml) of oil–overfilling or underfilling can affect clutch performance and component life. Always measure precisely and confirm via the level check screw.
  • Only transmission oil is changed;– as a two-stroke, there is no engine oil circuit. Changing gear oil is essential for ensuring smooth shifting and reducing clutch/transmission wear.
  • It—s best to change oil when the engine is warm as it flows more freely and drains more contaminants.
  • Monitor for excessive metal on the drain plug magnet–very fine powder is typical, but flakes or chunks warrant further inspection of internal components.
  • When reinstalling the drain and level screws, do not over-tighten–aluminum cases are prone to stripping, and over-tightening the fill or level screws can damage threads.
  • Motorcycle should always be vertical and level when draining and refilling to ensure precise oil level reading.
  • For best results, replace the drain plug washer every service to ensure a tight seal and prevent leaks.

Final Notes

  • Changing transmission oil every 10–15 engine hours, or sooner in harsh conditions, keeps your WR300 running smoothly.
  • Use only motorcycle-specific gear oils, not automotive oils.
  • Consult your 2009 WR300 Owner—s Manual for recommended oil brands and intervals.

Regular maintenance ensures your Husqvarna WR300 delivers peak performance and reliability every ride. Trust MotoSport.com for all your service kits, fluids, and expert advice for your next project.

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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.