How to Change the Oil in a 2011 Husqvarna WR150 – MotoSport.com Guide

Shop Parts for a 2011 Husqvarna WR150 Dirt Bike.

Changing the oil in your 2011 Husqvarna WR150 is essential maintenance that greatly extends the life of your bike’s engine and transmission. This step-by-step guide, created specifically for MotoSport.com customers, walks you through the entire process with a focus on the tools, correct procedures, and crucial WR150 model-specific tips.

Tools & Supplies Needed

  • 10mm or 13mm socket wrench (drain plug size may vary – check your bike first)
  • Oil drain pan
  • Funnel
  • Clean shop rags or paper towels
  • New transmission oil – SAE 10W-40 is recommended for the Husqvarna WR150
  • New crush washer (optional, but recommended every few changes)
  • Torque wrench (optional, for precise drain plug tightening)
  • Stand for the motorcycle
  • Nitrile gloves (to keep hands oil-free)

Step-by-Step Instructions

  1. Warm Up the Engine
    • Start your WR150 and let it idle for 2–3 minutes. Warm oil drains more thoroughly, removing more contaminants.
    • Turn the engine off before proceeding.
  2. Position the Bike and Prepare Your Work Area
    • Set the WR150 upright on a stand in a well-ventilated area.
    • Lay cardboard or shop rags under the workspace to catch any spills.
  3. Locate and Remove the Drain Plug
    • On the 2011 WR150, the transmission oil drain bolt is found on the lower right-hand side of the engine.
    • Use a socket wrench to loosen, then remove the plug carefully and allow oil to drain into your pan.
    • Tip: You may need to tilt the bike slightly right to ensure a complete oil drain.
  4. Remove the Filler Cap
    • Unscrew the oil filler cap, located on the right side of the engine above the drain plug. This helps oil drain faster by preventing vacuum.
  5. Inspect the Oil
    • Look for signs of metal shavings or a milky appearance in the drained oil, indicating the need for further investigation.
  6. Replace the Crush Washer
    • If your drain plug has a crush washer, inspect and replace it to ensure a tight seal and prevent leaks.
  7. Reinstall the Drain Plug
    • Hand-tighten the plug, then torque to manufacturer specs if possible. Be careful not to over-tighten and strip the threads.
  8. Refill with New Oil
    • Using a funnel, pour just under 0.75 liters (~750 ml) of 10W-40 transmission oil into the filler. Do not overfill – precise level is important for two-strokes.
    • Visual Level: The WR150 may have a “weep” or check bolt; fill until oil just starts to trickle from this bolt (with bike upright), then re-install the bolt.
    • Replace the oil filler cap when done.
  9. Clean Up
    • Wipe away spills and dispose of old oil properly at a recycling center.
  10. Start and Check for Leaks
    • Start the WR150, idle for a minute, and inspect thoroughly around drain and fill plugs for leaks.
    • Shut off engine and verify oil level through the check bolt if equipped, topping up slightly if needed.

WR150 Model-Specific Call-Outs

  • The engine/transmission are separate from pre-mix fuel – never fill the oil reservoir with premix or engine oil meant for fuel.
  • Always use quality 10W-40 motorcycle oil formulated for wet clutches and two-stroke transmissions.
  • The check bolt or “weep hole” (if equipped) should just begin to weep oil when filled properly; do not overfill, as this can cause clutch drag.
  • If you ride in extreme mud/water, consider changing gearbox oil more often.
  • Tighten all bolts evenly and avoid using air tools, which can strip threads on the WR150’s engine cases.

Common Pitfalls and Mistakes to Avoid

  • Over-tightening drain plug: Stripping the threads can require costly repairs. Always tighten by hand and finish with a torque wrench if available.
  • Overfilling oil: Causes pressure issues and clutch slipping. Always check level at the weep/check bolt.
  • Poor oil disposal: Never pour oil onto the ground or into drains. Use a recycling facility.
  • Forgetting to replace filler or drain plug: Can result in catastrophic oil loss. Double-check before starting the engine.

Recommended Oil Change Interval for WR150

  • After break-in: First oil change at 1–2 hours of engine time.
  • Regular change: Every 10–12 hours of riding or every few race/weekend rides, whichever comes first.
  • Extreme use (mud, racing): Every 5–6 hours is a good interval for optimal performance.

Changing your transmission oil regularly is the best investment you can make in the long-term performance and reliability of your 2011 Husqvarna WR150. Have any more Husqvarna maintenance questions? MotoSport.com is your trusted resource for parts, oils, and expert advice.

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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.