How to Change the Oil in a 2006 Honda CR85

Shop parts for a 2006 Honda CR85 Dirt Bike.

If you ride a 2006 Honda CR85, regular oil changes are essential for maximum performance and engine longevity. Follow this guide to change the oil like a pro, including all the required tools, expert techniques, and key model-specific tips every owner should know. This proprietary how-to is brought to you by MotoSport.com.

Tools and Supplies Needed

  • New gear oil or 2-stroke transmission oil – Honda recommends gear oil rated for 2-stroke transmissions. The capacity is 600ml for the CR85. Never use engine oil for this application.
  • 3/8” drive ratchet and sockets (typically 12mm for drain bolt)
  • Drain pan
  • Shop towels or rags
  • Funnel (optional, for easy pouring)
  • Replacement crush washer for drain bolt (recommended)
  • Gloves (optional, for cleanliness)

Step-by-Step Oil Change Instructions

  1. Warm Up the Bike
    • Start and run the engine for 2–3 minutes. This helps the oil drain more thoroughly by thinning it out and suspending contaminants.
  2. Stabilize the Bike
    • Shut off the engine. Place the bike upright on a triangle stand or a secure, level surface.
  3. Remove the Filler Cap
    • Locate the oil filler cap on the right side crankcase cover. Remove it to allow oil to drain freely and quickly.
  4. Locate the Drain Plug
    • Find the oil drain bolt under the right-bottom side of the engine case. Place your drain pan directly underneath.
      CR85-Specific Note: The drain bolt is easy to spot and access, under the engine near the right foot peg area. The CR85 transmission uses a single oil compartment.
  5. Remove the Drain Bolt
    • Using your socket wrench, loosen and remove the drain bolt. Allow all oil to drain completely into the pan.
      Tip: Watch for the crush washer. If it’s damaged or excessively flattened, replace it to prevent leaks during reinstallation.
  6. Let Oil Drain Completely
    • Give the oil several minutes to drain fully. You may slightly tilt the bike side-to-side to help the last drops flow out.
  7. Reinstall the Drain Bolt
    • Wipe the bolt and sealing area clean. Replace the crush washer if needed. Thread the bolt in by hand, then tighten lightly with your ratchet to manufacturer’s specs (do not overtighten).
  8. Add New Oil
    • Insert a funnel into the filler opening and pour in 600ml of high-quality 2-stroke transmission oil, as marked on the crankcase stamp.
    • Callout for 2006 CR85: There is a 600ml stamping on the case — use this exact amount for best results. Do not overfill, as it can cause shifting issues or clutch drag.
  9. Replace the Filler Cap
    • Tighten the oil filler cap securely by hand.
  10. Start and Inspect
    • Start the engine, let it idle for a minute, then turn it off and inspect for leaks. Check oil level again if your bike has a sight glass or dipstick, but for the CR85, using the measured amount is sufficient.

Model-Specific Tips for the 2006 Honda CR85

  • Use only oils specified for 2-stroke transmissions. Do not use engine oil or automotive ATF unless specified by Honda or a trusted powersports mechanic.
  • Check that you’re using the correct oil capacity: The case is stamped “600cc,” which is approximately 600ml – always measure. Overfilling may cause clutch or shifting problems.
  • Inspect the area around the drain plug for cracks or damage, as these engines can be subject to impacts on the trail.
  • Always replace a damaged or flattened crush washer to eliminate the risk of future leaks.

Disposal and Final Checks

  • Always recycle used oil at a proper facility. Never pour it down a drain or toss it in the trash.
  • Check for any spills and wipe up as needed – oil on your bike or garage floor can be dangerous.
  • Monitor the transmission for a few rides after the first change. If you notice clutch slip or difficulty shifting, double-check your fill quantity and oil type.

Trust MotoSport.com for all your CR85 maintenance needs. Keep your Honda running strong with regular oil changes and top-quality products.

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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.