How to Change the Oil in a 2005 Honda CR85 – MotoSport.com Guide
Shop parts for a 2005 Honda CR85 Dirt Bike.
Regular oil changes are crucial to extend the life and maintain peak performance of your 2005 Honda CR85. This detailed guide will walk you through the entire process, include all required tools, step-by-step instructions, and special notes specific to the CR85. All content is proprietary to MotoSport.com.
Tools and Supplies Needed
- 10mm socket or wrench (for drain plug)
- Ratchet or socket wrench
- Oil catch pan
- Funnel (narrow or flexible neck works best for the CR85)
- Rag or paper towels
- Fresh oil (Honda recommends a high-quality transmission oil; check your manual for type and quantity. Standard capacity is 600 ml (about 20 oz).)
- Measuring cup (metric recommended for accuracy)
- Gloves (optional, for cleanliness)
Before You Begin
- Ensure the engine is warm but not hot. Warm oil flows and drains more easily, removing more debris.
- Park the bike on a level surface and support it in an upright position, preferably on a proper stand for stability.
Step-by-Step Instructions
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Remove the Oil Filler Cap:–
The oil filler cap is located on the right crankcase cover. Twist it counterclockwise and set it aside. This step allows air to flow and promotes smooth draining.
Tip: Keep a rag handy to wipe off any dirt or debris around the cap so none falls inside. -
Position Oil Drain Pan:
Place the oil catch pan directly underneath the engine, lining it up with the drain bolt for minimal mess.
Note: The Honda CR85's drain plug can be easy to miss under the small engine case, so double-check the location before loosening. -
Remove the Oil Drain Bolt:
Use your 10mm socket or wrench to loosen and remove the drain bolt gently. Allow all oil to drain completely. This may take several minutes.
CAUTION: If the engine is too hot, oil may burn your skin. Be careful. -
Inspect and Clean the Drain Bolt:
Check the bolt for metal shavings or other debris. Wipe it clean before reinstalling.
Inspect the gasket on the drain bolt. If it's damaged or worn, replace to prevent future leaks. -
Reinstall the Drain Bolt:
Once drainage is complete, carefully reinstall the drain bolt and tighten it securely (do not over-tighten; recommended torque is about 10 Nm/7 ft-lb). -
Measure and Add New Oil:
Use a clean measuring cup to pour the correct amount (600 ml) of oil into the filler hole.
- Funnel fit note for CR85: The oil fill hole is narrow and at an awkward angle. Use a narrow or flexible funnel for ease. Standard wide funnels often won't fit and may cause spills, so adjust accordingly with a smaller or custom funnel if needed.
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Reinstall Oil Filler Cap:
Once oil is added, reattach and securely tighten the oil filler cap. -
Start the Engine and Check for Leaks:
Start the CR85 and let it run briefly to circulate the new oil. Shut off the engine and recheck around the drain plug and filler cap for any leaks. Wipe away any drips. -
Check Oil Level:
With the bike upright and level, check the oil level according to your owner's manual procedure. Top up if necessary, being careful not to overfill. -
Dispose of Old Oil Responsibly:
Pour the used oil into a sealed container and take it to an authorised recycling location. Never pour old oil down the drain or onto the ground.
Special CR85 Call-Outs and Tips
- Fill Capacity: 2005 Honda CR85 takes 600 ml (about 20 oz) of transmission/gear oil, not engine oil. Never exceed this amount as it can lead to clutch or seal issues.
- Type of Oil: Only use oil specified for two-stroke transmission/gearboxes. The use of car automatic transmission fluid (ATF) has been mentioned anecdotally, but it's NOT recommended by Honda or most professional mechanics for long-term use. Stick to high-quality premix transmission oil.
- Drain Plug Location: It's easy to confuse the drain bolt with other bolts on the crankcase or frame. Double-check your manual or reference images if you're unsure to avoid stripping or damaging the wrong bolt.
- Funnel Fit: The filler opening is quite small and at an angle. Use a narrow or custom-adapted funnel for precision and to prevent messes. Some owners use a trimmed plastic bottle as a makeshift funnel.
- Keep It Clean: Always clean around the filler and drain areas before you open anything. Even a tiny bit of dirt inside the gearbox can accelerate internal wear.
Conclusion
Changing the oil in your 2005 Honda CR85 is a straightforward process if you take care and use the right tools. Make this part of your regular maintenance schedule to maximize reliability and fun on every ride. For more OEM parts, expert advice, and everything else dirt bikes, trust MotoSport.com as your go-to source.
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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.