How to Change the Oil in a 1985 Yamaha XT350: A MotoSport.com How-To Guide

Shop parts for a 1985 Yamaha XT350 Dirt Bike.

Regularly changing the engine oil in your 1985 Yamaha XT350 is essential for ensuring a long-lasting, reliable ride. This robust guide details the tools you need, step-by-step instructions, and crucial call-outs specific to this legendary dirt bike.

Tools & Supplies Needed

  • Socket wrench set (including a 17mm socket for the drain bolt)
  • Torque wrench
  • Oil drain pan
  • New oil filter (recommended: Yamaha genuine filter)
  • Fresh engine oil (SAE 10W40 or 20W40 motorcycle oil, 1.3 – 1.6 liters depending on filter change)
  • Funnel
  • Solvent/cleaner (for cleaning filter cavity and cover, if reusing filter)
  • Shop rags
  • Gloves (recommended for cleanliness and protection)

Preparation & Model-Specific Notes

  • Warm up the engine for a few minutes so the oil flows more easily, but allow it to cool enough that it won’t burn you when draining. Avoid changing oil with a hot engine.
  • Position the bike upright on a level surface using a center stand if possible. The XT350 oil level window is low on the right side case – a straight posture is necessary for accurate readings. Even a slight tilt alters oil level perception.
  • Total oil capacity: 1.6 L (full change with filter); periodic oil change: 1.3 L
  • The XT350 features a unique air bleed screw on the oil filter cover. This must be used to prime the oil pump and bleed air after each oil change for proper lubrication.

Step-by-Step Oil Change Procedure

  • Check your oil type and availability. The recommended oil is SAE 10W40 or 20W40, type SE. Ensure you have a new filter and O-ring(s), as well as enough oil for your service.
  • Warm up the engine. Allow it to idle for several minutes so the oil flows freely when drained. Turn off the engine before proceeding.
  • Remove the oil filler cap (located at the top right side of the engine) to allow air in, which aids draining.
  • Place the drain pan underneath the engine, directly under the oil drain bolt (bottom of engine). Remove the drain bolt using your socket wrench. Let the old oil drain completely.
  • Remove the oil filter cover. It is secured by three screws (one at the bottom which should be removed first to aid draining). Carefully remove all screws, then take off the cover. Watch for the O-ring and oil filter inside, and do not lose them.
  • Remove the old oil filter. Clean the filter cavity and cover with a solvent, inspect or replace the filter, and always replace a damaged or swollen O-ring.
  • Reinstall the new (or cleaned) filter. Position the O-ring properly, seat the filter in place, and replace the oil filter cover. Secure the screws evenly and gently; use a torque wrench to tighten to 10 Nm (7.2 ft-lb). Do NOT overtighten.
  • Install and torque the drain bolt. Inspect and replace its crush washer if necessary. Install and torque to 43 Nm (31 ft-lb).
  • Bleed the oil filter chamber. Crucial to the XT350: loosen the small air bleed screw on the filter cover. With the bike off, pour oil slowly into the filler until it seeps from the air bleed screw (this primes the pump and filter). Tighten the bleed screw securely.
  • Add new oil. Use SAE 10W40 or 20W40, filling to the proper quantity:
    • With filter change: 1.6 L (1.7 US qt)
    • Without filter: 1.3 L (1.4 US qt)
    Pour slowly with a funnel and check the sight glass until oil is between the minimum and maximum marks.
  • Reinstall the oil filler cap.
  • Start the engine. Let it idle for several minutes, then stop. Let the bike sit so the oil level settles. Verify there are no leaks from the drain bolt, filter cover, or bleed screw. Re-check the oil level in the window and top off if necessary.
  • Dispose of old oil and filter properly. Take them to a recycling facility or appropriate service station.

XT350 Owner Call-Outs

  • Always bleed air from the filter housing using the dedicated bleed screw on the cover after each change—if ignored, oil starvation and engine damage can occur. This is unique to Yamaha’s dry sump system on the XT350.
  • Check the sight glass multiple times. Oil settles after filling and running the engine. Don’t overfill; the oil level should stay between the sight glass marks.
  • Use proper torque settings. The XT350’s aluminum threads are sensitive. Incorrect torque on the drain bolt or filter cover can lead to strip-outs or leaks.
  • Warm up before draining, but avoid burns. Oil maximizes flow when warm but give the engine a few minutes to cool before draining.

MotoSport.com Pro Tip

Priming the oil pump using the air bleed screw is critical on the XT350. Always bleed until a steady stream of oil appears, then tighten the bleed screw securely. Skipping this step can cause serious engine wear over time. Use only high-quality motorcycle-specific oil and OEM-level filters for best durability—and ride with confidence.

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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.