How to Change the Oil in a 1990 Suzuki DR650S

Shop parts for a 1990 Suzuki DR650S Dirt Bike.

Regular oil changes are crucial to maintaining the performance and longevity of your 1990 Suzuki DR650S dirt bike. This guide, proprietary to MotoSport.com, walks you through every step of the process, highlighting the tools you need, the specific steps to follow, and model-specific notes that every 1990 DR650S owner should keep in mind. Always refer to your motorcycle's service manual as the authority on service procedures and specifications.

Tools & Materials Needed

  • 17mm socket and ratchet (for drain plug)
  • 8mm socket and ratchet (for oil filter cover bolts)
  • Oil drain pan
  • Funnel
  • Clean, lint-free rags
  • New oil filter (Suzuki OEM recommended)
  • New drain bolt washer (crush washer)
  • Replacement O-rings (for oil filter cover and filter as specified)
  • SAE 10W-40 engine oil (API SE or SF classification), 2.15 liters (2,150 ml) with filter change
  • Torque wrench (for drain plug and filter cover bolts)
  • Contact cleaner or brake cleaner (optional, for cleaning surfaces)
  • Disposable gloves (to keep hands clean)

Step-by-Step Oil Change Instructions for the 1990 DR650S

  1. Warm Up the Engine
    • Run the engine for 3-5 minutes to warm the oil. Warm oil drains out more effectively and carries contaminants with it.
  2. Secure the Motorcycle
    • Use a center stand, jack, or wooden block to keep the bike upright and level. This ensures accurate draining and refilling of oil.
  3. Remove the Oil Drain Plug
    • Place the oil drain pan under the engine.
    • Use the 17mm socket and ratchet to loosen and remove the drain plug. Be cautious as the oil may be hot.
    • Allow all old oil to drain out completely.
    • Tip:– If equipped with a skid plate, you may need to remove it for drain plug access.
  4. Remove the Oil Filler Cap
    • Unscrew the oil filler cap to allow faster and more complete draining.
  5. Replace Washers and Clean Surfaces
    • Replace the old crush washer on the drain bolt with a new one to ensure a leak-free seal.
    • Clean the area around the oil filter cover and drain plug with a rag and contact cleaner if needed.
  6. Remove the Oil Filter
    • Using the 8mm socket, remove the three bolts securing the oil filter cover.
    • Carefully pull off the cover; a small amount of oil may drip out.
    • Remove the old oil filter and any O-rings or springs behind it.
    • Model-Specific Call-Out:– For the 1990 DR650S, ensure that the oil filter spring and O-rings (one on the cover, one behind the filter) are present and in good condition. Replace these as needed for proper sealing and pressure.
  7. Install the New Oil Filter
    • Lubricate the new filter's O-rings with fresh oil.
    • Reinstall the spring in the correct position if applicable.
    • Seat the new filter and close the cover, tightening any bolts evenly by hand first to avoid warping.
    • Tighten cover bolts to 7 ft-lb (around 10 Nm) using a torque wrench to prevent over-tightening and damage.
  8. Reinstall the Oil Drain Plug
    • After oil has fully drained, reinstall the drain plug with the new crush washer.
    • Tighten the drain plug to 17.5 ft-lb (about 24 Nm) using a torque wrench.
  9. Refill with Fresh Oil
    • With the bike still upright, insert a funnel into the oil filler hole.
    • Pour in 2,150 ml (2.15 liters or about 2.3 US quarts) of SAE 10W-40 oil if you changed the filter. Double-check your owner's manual for exact quantities.
    • Replace and secure the oil filler cap.
  10. Run the Engine and Check Oil Level
    • Start the engine and let it idle for 2-3 minutes. Turn it off and wait 5 minutes.
    • Check the oil level through the inspection window or dipstick. Add oil if the level is below the “F” (full) mark.
  11. Clean Up and Test
    • Check for leaks at the oil filter cover and drain plug. Wipe away any spills.
    • Dispose of used oil and filter as required by local environmental laws.

Specific 1990 DR650S Call-Outs

  • The oil capacity is 2,000 ml for a change, 2,150 ml with a filter swap, and 2,600 ml after a full engine overhaul.
  • This model uses an external oil filter with spring and O-rings which must be properly reinstalled to maintain oil pressure and prevent leaks.
  • SAE 10W-40, API SE or SF oil is the recommended viscosity and rating for all temperature conditions during regular use.
  • The oil should be changed every 6,000 km (4,000 miles) or 12 months, and the filter replaced every 12,000 km (7,500 miles) or 24 months, whichever comes first. Dirt or racing use may require more frequent changes.

Final Tips

  • Double-check the orientation and seating of O-rings and the filter spring before assembling the filter cover—incorrect assembly is a common cause of oil leaks.
  • Always use a torque wrench to avoid stripping bolts or over-tightening covers.
  • Inspect old oil for metallic debris, which could indicate engine wear.
  • Document your oil change for future maintenance records.

Maintaining your 1990 Suzuki DR650S with regular oil changes keeps your machine running reliably. For the best results, stick with genuine Suzuki parts and follow service intervals as detailed in your owner's manual.

Related Shopping Categories

Shop Motor Oil for a 1990 Suzuki DR650S Dirt Bike.

Shop Oil Filters for a 1990 Suzuki DR650S Dirt Bike.

Shop Oil Drain Pans for a 1990 Suzuki DR650S Dirt Bike.

Shop Tools for a 1990 Suzuki DR650S Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 1990 Suzuki DR650S Dirt Bike.

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.