How to Change the Oil in a 1985 Yamaha XT600

Shop parts for a 1985 Yamaha XT600 Dirt Bike.

Changing the oil regularly in your 1985 Yamaha XT600 is crucial for the longevity and performance of your legendary dual-sport. The process is straightforward but requires attention to detail due to the XT600’s dry sump oiling system, which differs from standard wet sump motorcycles. Below you’ll find everything you need to complete a precise, mess-free oil change–with key details specifically for the 1985 model.

Tools & Supplies Needed

  • Socket set (specifically: sockets for drain and filter bolts)
  • 14 x 20 x 1.5mm aluminum sealing ring (for drain plug gasket)
  • Hiflo oil filter (or equivalent, see part HF145 for reference)
  • Oil drain pan
  • Rags or shop towels
  • Funnel
  • Yamaha-recommended oil: 10W-40 or 20W-50 (check owner’s manual; estimate oil volume ~2.8 quarts or 2.7 liters)
  • Torque wrench
  • Screwdriver (for filter cover)
  • Protective gloves

Step-by-Step Oil Change Instructions

  • Warm the Engine
    Start and run the motorcycle for 3–5 minutes. This helps the oil become less viscous and allows contaminants to suspend in the oil, so they drain out fully.
  • Secure the Bike
    Place your XT600 on a stable, flat surface using the center stand or a bike lift. Turn off the ignition and ensure the bike is secured.
  • Remove Skid Plate or Plastic Cover (if applicable)
    For an XT600 with the stock plastic underbelly plate, you’ll need to remove it to access the drain plug. This may require a few bolts or screws .
  • Locate and Remove the Oil Drain Plug
    The 1985 Yamaha XT600 features a dry sump system: oil is stored in a separate tank, not the crankcase . There are usually two drain points–one on the engine case below, and one under or near the oil “tank” (often located under the seat or on the frame).
    • Place your drain pan beneath the engine's main drain bolt.
    • Loosen the drain plug with the correct socket and allow oil to drain completely.
    • Repeat this step for the drain plug on the oil tank, if present.
    • Replace the old sealing washer with a new 14 x 20 x 1.5mm aluminum ring on the main drain plug .
  • Remove and Replace the Oil Filter
    • Locate the oil filter cover on the right side of the engine.
    • Remove the bolts holding the cover (keep track of their order; sometimes their length varies) .
    • Carefully remove the cover—some oil may drain, so keep your pan under the bike.
    • Take out the old oil filter and rubber O-ring; wipe the surfaces clean.
    • Install the new Hiflo oil filter (or Yamaha equivalent); lubricate the O-ring with fresh oil and check it’s seated properly .
    • Reinstall the filter cover and torque the bolts evenly (Yamaha spec for these is around 7 Nm or 5.1 ft-lbs).
  • Refit Drain Plugs
    • Reinstall both drain plugs (engine and tank) with new sealing washers. Torque to manufacturer’s specs (about 30 Nm/22 ft-lbs for the main drain bolt, 18 Nm/13 ft-lbs for the tank) .
  • Add New Oil
    • Remove the oil filler cap from the oil tank (usually on the side of the frame or under the seat).
    • Using a funnel, pour in fresh oil (2.7 – 2.8 quarts or as specified in your manual) .
    • Replace the cap and let the oil settle for a minute.
  • Check Oil Level
    • Start the engine and let it idle for 1–2 minutes. Check for leaks at the drain plugs and filter cover.
    • Switch off and wait a minute, then use the dipstick or sight glass to check the oil level. Top up if necessary–do not overfill.
  • Dispose of Old Oil and Filter Properly
    Take used oil and the filter to a recycling facility or an authorized oil collection location.
  • Reinstall Any Plastic Covers/Skid Plate
    Ensure all fasteners are secure.

XT600-Specific Callouts and Tips

  • Dry Sump System: Oil is carried in a remote “tank,” not the crankcase. Failure to drain both the engine and tank can result in dirty oil remaining in the system .
  • Sealing Washer Size: Confirm that you use a 14x20x1.5mm aluminum washer for the 1985 drain plug .
  • Oil Filter Orientation: The open side of the filter faces OUTWARD. Watch for the rubber O-ring—replace if damaged or deformed .
  • Oil Type and Volume: Yamaha recommends 10W-40 or 20W-50; volume for a dry change is approximately 2.8 quarts .
  • Torque Specs: Over-tightening drain bolts or filter screws can strip threads—use a torque wrench.
  • Annual/Interval Changes: For best performance, change the oil every 1,000–2,000 miles or annually, whichever comes first, depending on riding conditions.

This comprehensive how-to is proprietary to MotoSport.com and specifically addresses the 1985 Yamaha XT600. Regular oil and filter changes are the simplest and most effective ways to keep your XT running strong on any adventure. If you have additional questions or want oil change kits designed for the XT600, check MotoSport.com for the best selection of filters, gaskets, and oils for vintage Yamaha motorcycles.

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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.