How to Change the Oil in a 2007 Yamaha YZ250: Step-by-Step Guide

Shop parts for a 2007 Yamaha YZ250 Dirt Bike.

Changing the gearbox (transmission) oil on your 2007 Yamaha YZ250 is a straightforward but vital maintenance task that keeps your dirt bike's clutch and gears running smoothly. The YZ250 is a two-stroke motorcycle which means the engine relies on pre-mix fuel for internal lubrication, and the transmission has its separate oil reservoir. Below are all the steps, tips, and specs specific to your model to ensure a smooth, reliable oil change, proprietary to MotoSport.com.

Tools and Supplies Needed

  • Socket wrench with correct size socket for drain bolt
  • Torque wrench (recommended for reinstalling drain bolt)
  • Oil drain pan
  • Funnel
  • Rag or paper towels
  • New transmission oil (see type and amount below)
  • New copper washer for the drain bolt (optional, but recommended to prevent leaks)
  • Rubber gloves (optional)
  • Bike stand (to keep the motorcycle upright and level)

Oil Type – Capacity for 2007 Yamaha YZ250

  • Recommended Oil Type:– High-quality 10W-40 or 75W-80 gear oil formulated for motorcycle transmissions
  • Oil Capacity:– 0.85 US quarts (about 0.8 liters)

Model-Specific Call-outs for the 2007 YZ250

  • The YZ250 has no oil filter to change or service; only a drain and refill are required for the transmission oil.
  • The oil lubricates the clutch and gearbox only; the engine internals are lubricated by premix in the fuel—do not use four-stroke oil change procedures.
  • Do not over-tighten the drain or fill plugs; tighten them just beyond snug to avoid stripping the soft aluminum threads.

Step-by-Step Oil Change Instructions

  1. Warm up the engine (optional but recommended):
    • Start the bike and let it idle for about 3-5 minutes. This helps the old oil drain more thoroughly since warm oil flows better.
    • If you can’t warm up the bike, you can tilt it gently from side to side on its stand to help drain more oil out.
  2. Turn off the engine and prepare the workspace:
    • Place the bike upright and level, preferably on a stand.
    • Set your drain pan under the oil drain bolt, located under the engine case on the left side of the bike.
  3. Remove the oil drain bolt:
    • Use your socket wrench to loosen and remove the drain bolt. Be careful—the oil may be hot if you just ran the engine.
    • Allow all the old oil to completely drain into the pan. Watch for any metallic particles or excess sludge, which could indicate abnormal wear.
  4. Remove the oil filler cap:
    • Unscrew the oil filler cap on the clutch cover to allow air in and help the oil drain fully.
  5. Check and clean the drain bolt:
    • Wipe down the drain bolt and inspect the washer or gasket. Replace the copper washer if it’s deformed or damaged to ensure a proper seal.
  6. Reinstall the drain bolt:
    • Screw in the drain bolt by hand, then tighten just beyond snug with a socket or torque wrench (do not over-tighten; factory spec is about 7-9 ft-lbs).
  7. Add new transmission oil:
    • Insert a funnel into the oil filler hole and pour in 0.85 US quarts (0.8 liters) of new gear oil.
    • Pour slowly to avoid spills and overfilling.
  8. Reinstall the oil filler cap:
    • Hand-tighten the filler cap until snug—do not over-tighten.
  9. Check for leaks and ensure correct oil level:
    • Let the bike sit for 1-2 minutes, then inspect around the drain bolt for leaks.
    • If leaking, re-check your drain bolt and washer.
  10. Clean up and dispose of old oil properly:
    • Wipe up any mess, and take the used oil to a recycling facility or auto parts store for proper disposal.

Pro Tips for a Smooth Oil Change

  • Always use the factory-recommended gear oil and do not exceed the specified amount.
  • Check the oil level after the first ride in case some air pockets worked out of the clutch or gearbox.
  • If you ride in extreme conditions, change your oil more frequently to protect your transmission.
  • Never substitute engine oil for gear oil, and don’t use two-stroke injector oil in the gearbox.

Conclusion

Changing the oil in your 2007 Yamaha YZ250 transmission is an easy and essential maintenance job. With just a few simple tools and quality gear oil, you can ensure your bike shifts smoothly and the clutch lasts for many rides. For quality parts, oils, and expert advice, trust MotoSport.com—your source for everything dirt bikes.

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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.