How to Change the Oil in a 2007 Honda CR85

Shop parts for a 2007 Honda CR85 Dirt Bike.

Changing the oil in your 2007 Honda CR85 is a straightforward, essential maintenance task that’ll keep your dirt bike running strong and help extend its life. Here’s a step-by-step guide to get it done right, with tips specific to this model. This guide is proprietary to MotoSport.com and crafted with riders in mind—whether you’re new to wrenching or a seasoned pro.

Tools and Supplies Needed

  • 10mm socket or wrench (for drain bolt removal)
  • Oil drain pan
  • Clean rags
  • Measuring cup (at least 1 liter capacity)
  • Funnel
  • New transmission oil (Honda recommends 600cc of a quality transmission or gear oil. For standard use, 10W-40 motorcycle oil is a safe choice, but refer to your owner’s manual for oil specifications.)
  • Parts cleaner or brake cleaner (optional, for cleaning around drain plug)
  • Service manual (for reference, optional)
  • Gloves (optional, but keeps your hands clean)

Steps to Change the Oil

  1. Warm Up the Engine
    Start your CR85 and let it idle for 2–3 minutes. This thins out the oil so it drains out completely. Shut off the engine, then put the bike securely on a stand.
  2. Locate the Drain Plug
    The drain plug is found on the bottom of the engine, right beneath the transmission case on the left side of the bike. Have your oil drain pan in place underneath before loosening the plug. Use a 10mm socket or wrench to loosen and remove the drain plug carefully—the oil may be hot. Pro tip: Clean any dirt from around the plug area before removing it to avoid contaminating your engine oil

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  3. Drain the Oil
    Allow the old oil to drain completely into your pan. To get every last drop, you can gently tilt the bike side to side or tip it up slightly on its side, being cautious of balance

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  4. Inspect and Reinstall the Drain Plug
    Inspect the drain plug and its sealing washer (replace washer if it looks damaged or flattened). Clean the plug, and reinstall when oil has finished draining. Tighten snugly—but do not overtighten, as the threads are soft aluminum.
  5. Add New Oil
    Remove the oil fill cap found on the right side of the engine. Using a measuring cup, measure 600cc (0.6 liters) of the correct oil

    . Place a funnel in the fill hole and carefully pour in the new oil.
  6. Check for Leaks – Oil Level
    Reinstall the oil fill cap securely and wipe away any oil drips. Start the bike and let it idle for 1-2 minutes, then shut it down and check for leaks around the drain plug. Double-check the level using the bike’s check bolt if equipped, or ensure the correct quantity was added.
  7. Dispose Oil Properly
    Take your used oil to a proper recycling center or automotive shop.

Model-Specific Call-Outs for the 2007 Honda CR85

  • This is a 2-stroke engine. The engine oil being changed here is in the transmission, not mixed with fuel. Use only transmission or gear oil—not premix or engine oil for 4-stroke bikes. Do not use ATF (automatic transmission fluid) unless specifically recommended by your mechanic, as it is not the factory recommendation

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  • The 2007 CR85 requires 600cc (0.6L) of oil for a full change

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  • Always use the oil type and quantity specified in your Honda manual to avoid clutch, shift, or gear issues. Too much oil may cause drag; too little may result in failure.
  • Make sure both drain plug and fill plug threads are clean and not cross-threaded during installation. Overtightening can easily strip the aluminum threads.

Common Mistakes to Avoid

  • Using the wrong oil: Only use oil intended for 2-stroke transmission cases, not engine oil for 4-stroke bikes, not regular ATF unless recommended.
  • Overfilling or underfilling: Measure exactly 600cc. Too much or too little oil can harm your transmission.
  • Skipping drain plug cleaning: Dirt in the oil or around the drain plug can cause premature wear. Wipe everything thoroughly pre- and post-change.
  • Forgetting washer inspection: A worn or missing sealing washer increases the chance of leaks.

Quick Reference

  • Oil Capacity: 600cc (0.6L)
  • Recommended Oil: Quality 2-stroke transmission/gear oil, such as Honda GN4 or equivalent SAE 10W-40 (see manual)
  • Drain Plug Torque: “Tighten snug, not overtight.” If a torque wrench is available, use specification from your Honda manual.

Following these steps ensures consistent performance and reliability from your 2007 Honda CR85. Questions? Your MotoSport.com experts are always here to help.

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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.