How to Change the Oil in a 1997 Suzuki DR350S

Shop parts for a 1997 Suzuki DR350S Dirt Bike.

Maintaining the health of your 1997 Suzuki DR350S is crucial for performance and longevity. One of the most important regular maintenance tasks is an engine oil change. This guide, proprietary to MotoSport.com, walks you through every step, including essential tools, tips, and unique information specific to the DR350S’s design.

Tools and Supplies Needed

  • 17 mm wrench or socket
  • 12 mm wrench or socket
  • 10 mm wrench or socket
  • 19 mm wrench (for some bolts)
  • Needle-nose pliers (helpful for filter removal)
  • Flathead screwdriver
  • Oil drain pan
  • New crush washers (recommended for drain bolts)
  • Clean rags
  • Replacement oil filter (OEM or equivalent)
  • 2 quarts of 10W-40 motorcycle oil (non-energy conserving, JASO MA/MA2 rated)
  • Gloves (optional, for cleaner hands)
  • Service manual (optional, for torque specs and reference)

Special Call-outs for the 1997 Suzuki DR350S

  • Dry-Sump Oil System: The DR350S stores oil in the frame, not just in the crankcase. This system requires draining oil from both the crankcase and frame reservoir. There are also oil screen filters in the frame and engine to check periodically for debris.
  • Skid Plate Removal: For a complete oil change and access to the internal oil screen, the skid plate needs to be removed. This involves four 12 mm bolts–two on each side of the skid plate.
  • No Traditional Oil Pan: Take care not to over-tighten the drain plug as the threads go directly into the crankcase bottom and can be easily stripped, making repairs inconvenient.

Oil Change Procedure

  1. Warm Up the Engine
    Start the bike and let it idle for about 3–5 minutes. This thins out the oil, allowing it to drain completely.
  2. Remove the Skid Plate (if performing a full service)
    Use a 12 mm socket to remove the four bolts holding the skid plate. Set the plate and bolts aside.
  3. Drain Engine Oil
    Place your drain pan beneath the crankcase drain bolt. Using a 17 mm wrench, remove the bolt (with caution, as oil may be hot). Allow all oil to drain. Replace or inspect the crush washer. Install the bolt and tighten to specification.
  4. Drain Frame Oil (Dry Sump Reservoir)
    Locate the frame drain bolt—typically in the lower frame tube. Use a 12 mm wrench to remove it, allowing oil to drain into the pan. Inspect/reinstall with a new crush washer if needed.
  5. Remove and Replace Oil Filter
    Find the oil filter cover on the right side of the engine. Remove the bolts (typically 10 mm or 8 mm) and carefully remove the old filter. Wipe down the gasket sealing surface. Insert the new oil filter in the correct orientation. Reinstall the cover and bolts, tightening evenly.
  6. Inspect Oil Screens (Optional, for Thorough Service)
    If desired, use needle-nose pliers to remove the oil screen from the frame reservoir. Clean, inspect for debris, and reinstall.
  7. Refill With Fresh Oil
    Add 2 quarts (1.9L) of 10W-40 motorcycle oil in the oil filler located on the frame (near handlebars). Consult your owner’s manual for exact capacity. Replace the oil fill cap.
  8. Prime the Oil System
    With the bike off, slowly kick the starter several times with the decompression lever pulled to circulate oil into the system before starting. This step is crucial for minimizing dry starts.
  9. Reinstall Skid Plate
    Attach the skid plate using the four 12 mm bolts. Tighten securely.
  10. Start and Check Oil Level
    Start the engine and let it idle for 30 seconds. Turn off and let sit for a minute. Check the oil level using the dipstick or sight glass–top up as needed but do not overfill.
  11. Dispose of Old Oil Responsibly
    Take used oil and filter to a recycling center or auto parts store.

1997 Suzuki DR350S Model-Specific Tips

  • Always use a new crush washer on both drain plugs to prevent leaks.
  • Be careful not to cross-thread the drain bolts as the crankcase and frame threads are soft aluminum.
  • After refilling, run the bike and check carefully for leaks around the drain plugs and filter cover.
  • If your bike feels sluggish or you notice metal in the oil or screens, consult a mechanic for further inspection.

Final Inspection

  • Double-check all bolts for tightness.
  • Confirm oil level after running and letting the bike sit
  • Record the mileage and date for your maintenance log

Proper oil changes are vital for the performance and reliability of your 1997 Suzuki DR350S. For parts, filters, and high-quality oil, always trust MotoSport.com.

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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.