How to Change the Oil in a 1987 Honda CR80

Shop parts for a 1987 Honda CR80 Dirt Bike.

Changing the oil in your 1987 Honda CR80 is a key part of routine maintenance that is essential for protecting internal components and ensuring smooth operation. This comprehensive guide, proprietary to MotoSport.com, will walk you through the process from start to finish, including the tools you'll need, step-by-step instructions, and model-specific call-outs you should keep in mind for the 1987 CR80 dirt bike.

Tools and Materials Needed

  • Socket wrench set (8mm, 10mm sockets recommended)
  • Flathead screwdriver
  • Drain pan
  • Funnel
  • Clean rags or shop towels
  • Torque wrench (optional, highly recommended)
  • Fresh transmission oil (SAE 10W-40 motorcycle oil or SAE 80W/85W gearbox oil are both appropriate)
  • Gloves and protective gear

Preparation Steps

  • Ensure the CR80 is secure on a stand or level surface before you begin.
  • It's best to work with the engine warm (not hot) as this helps suspend contaminants and allows oil to flow out freely. Run the bike for a few minutes and then shut it off.
  • Check for any leaks or damage around the transmission case before draining.

Step-By-Step Oil Change Instructions

  • Locate the Drain Plug
    The drain bolt is found underneath the engine. Make sure your drain pan is positioned directly below this bolt.
  • Remove the Fill Cap
    Unscrew the oil fill cap on the right side of the engine at the top of the clutch cover. This step is crucial as it allows air in and helps the oil drain more quickly.
  • Drain the Old Oil
    Use a socket wrench to carefully loosen and remove the drain bolt.
    Allow all of the old oil to drain completely into the pan for several minutes. Tilting the bike gently side to side can help remove all residual oil.
    • Model-Specific Call-Out: The 1987 Honda CR80 transmission case is made of aluminum—avoid over-tightening bolts to prevent stripping threads or cracking the case.
  • Inspect and Clean
    Wipe the drain bolt clean (some models may have a magnet on the bolt to collect metal shavings—clean these thoroughly).
    • Inspect drain plug and gasket for any damage. Replace the washer or seal if it's worn out to prevent oil leaks.
  • Reinstall the Drain Bolt
    Hand-tighten the bolt and then use a torque wrench to finish tightening. For an aluminum case, do not overtighten; a snug fit is all that's needed (typically 7–12 ft-lbs if you have a torque spec).
  • Refill with Fresh Oil
    Insert a funnel into the fill hole.
    Recommended Oil: SAE 10W-40 motorcycle oil or SAE 80W/85W gearbox oil. For the 1987 CR80, use approximately 0.58 US quarts of oil, but always confirm the level by checking the sight glass, dipstick, or oil level bolt (depending on your model configuration) as you fill. Pour slowly to avoid overfilling.
    Stop adding oil as soon as you see oil begin to drip out of the oil level check bolt, if present.
  • Reinstall the Fill Cap
    Screw the cap back on snugly.
  • Final Check
    Start the engine and let it idle for a minute.
    Check for leaks around the drain plug and fill cap.
    If the oil level drops after the bike has circulated new oil, top off as necessary.
  • Dispose of Old Oil Properly
    Take the used oil to your local recycling center or automotive store that accepts used oil.

Model-Specific Tips and Warnings for the 1987 Honda CR80

  • Transmission Oil Only: The 1987 CR80 is a two-stroke engine. The oil you're changing is only for the transmission. The engine itself uses pre-mixed fuel (oil is mixed into the gasoline), so do not attempt to add engine oil separately.
  • Correct Oil Capacity: Always confirm the oil level after filling. Too little oil can result in poor shifting and clutch slippage; too much can cause foaming and increased resistance. The standard capacity is about 0.58 US quarts for the transmission oil.
  • Gasket Condition: Replace the crush washer or drain bolt gasket each time you change the oil if it appears damaged or flattened; this prevents leaks.
  • Thread Integrity: The aluminum case threads can be stripped easily. Always turn bolts in by hand first to prevent cross-threading, and do not overtighten.

Recap

Changing the oil in your 1987 Honda CR80 is a straightforward job that protects your dirt bike and keeps it riding strong on the track or trail. Following this guide ensures you'll get the job done efficiently and avoid the costly mistakes specific to this vintage two-stroke. For parts and recommended oils, you can always count on MotoSport.com for expert support and genuine gear.

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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.