How to Change the Oil in a 1987 Suzuki DS80 – A Complete MotoSport.com Guide

Shop parts for a 1987 Suzuki DS80 Dirt Bike.

Changing the oil in your 1987 Suzuki DS80 is a crucial maintenance task that ensures the longevity and performance of your dirt bike. This guide covers the complete process, including the tools needed, the best oil types, and unique call-outs for the 1987 DS80 model.

Tools and Materials Needed

  • Socket wrench set (8mm, 10mm recommended)
  • Drain pan
  • Funnel
  • Clean rags or paper towels
  • Replacement engine oil (high-quality 2-stroke oil, such as AMSOIL or equivalent synthetic designed for air-cooled two-stroke engines)
  • Flathead screwdriver (for side cover if required)
  • Gloves

Before You Start: Important Notes

  • The 1987 Suzuki DS80 is a two-stroke engine. It does not have the same oil system as a four-stroke; rather, oil is mixed directly with the fuel, or in some models, an oil-injection system feeds oil to the engine.
  • The only oil that needs changing is the transmission/gear oil, not crankcase oil as in four-strokes.
  • Always reference your official service manual for specific procedures and torque settings. The Cyclepedia Service Manual is a solid resource for this model year and covers all specifications in detail.

Step-by-Step: Changing the Transmission/Gear Oil

  1. Warm Up the Engine
    Briefly run the engine for 2-3 minutes. This helps thin the old oil for easier and more complete draining. Do not overheat the bike—moderate warming is sufficient.
  2. Position the Bike
    Place your DS80 on a secure, level stand. Make sure it is steady and will not tip over during the procedure.
  3. Locate the Drain and Fill Plugs
    The drain plug is typically found at the lowest point of the right-side crankcase. The fill plug is usually on the right side as well, just above the clutch cover. Refer to a DS80 service manual if unsure.
  4. Remove the Fill Plug First
    Use the appropriate socket or screwdriver to remove the oil fill plug. This allows air in and ensures smoother oil draining.
  5. Drain the Old Oil
    Position your drain pan under the drain plug. Carefully remove the drain plug (typically 8mm or 10mm) and allow all oil to drain. Wipe away residue with a rag.
  6. Inspect and Clean
    Inspect the drain plug's threads and magnet (if equipped) for metal shavings. Clean any debris off. Replace the washer if damaged to prevent leaks.
  7. Reinstall the Drain Plug
    Once oil is fully drained and parts cleaned, thread the drain plug back in by hand. Tighten to manufacturer torque spec (refer to manual; typically around 7–10 ft/lbs for this model, but always double-check).
  8. Add Fresh Oil
    Using a funnel, pour recommended transmission oil into the fill hole. For the 1987 DS80, the typical capacity is approximately 650 ml (0.69 US qt) of high-quality two-stroke transmission oil (e.g., Klotz, Maxima, Motul, AMSOIL). Avoid over-filling.
  9. Check Oil Level
    Some models have a level check bolt or sight window. If so, remove it and fill oil until it just starts to come out, then reinstall. If not, rely on measured quantity.
  10. Reinstall the Fill Plug
    Place the fill plug back and tighten firmly. Wipe any spilled oil off the case.
  11. Start and Check for Leaks
    Start the engine, let it idle briefly, and check for leaks at the plugs. Shut off and recheck oil level if needed.

Model-Specific Call-Outs for the 1987 Suzuki DS80

  • This model uses a pre-mix or automatic oil injection system. If your bike uses automatic injection, ensure the oil tank for the injector is full of fresh two-stroke oil.
  • Never use standard four-stroke engine oils. They lack the formulation for two-stroke gearboxes and may cause clutch slippage or gear wear.
  • Regular oil changes every 10–20 hours of use or after heavy rides will maximize gearbox and clutch lifespan.
  • Tighten all plugs using a torque wrench. Over-tightening can strip threads in the aluminum crankcase.

Recommended Oil Brands and Specifications

  • AMSOIL Synthetic 2-Stroke Motorcycle Oil (high quality for small-bore dirt bikes)
  • Maxima, Motul, Klotz, or Valvoline Motorcycle Gear Oil with API GL-4 or equivalent specification
  • Viscosity: 10W-30 or 75W-80 (gearbox oil), depending on riding climate (refer to your manual for confirmation)

Summary

Changing the transmission oil on your 1987 Suzuki DS80 is a straightforward and essential task for ensuring durability and smooth shifting. Always use high-quality 2-stroke gearbox oils, do not overfill, and follow proper torque settings. Performing this regularly will keep your Suzuki running strong on the trail or the track.

If you need more guidance, consult the official Cyclepedia Suzuki DS80 Service Manual for diagrams and specific torque values—an invaluable resource for your workbench.

Copyright © 2025 MotoSport.com. All Rights Reserved.

Related Shopping Categories

Shop Motor Oil for a 1987 Suzuki DS80 Dirt Bike.

Shop Oil Filters for a 1987 Suzuki DS80 Dirt Bike.

Shop Oil Drain Pans for a 1987 Suzuki DS80 Dirt Bike.

Shop Tools for a 1987 Suzuki DS80 Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 1987 Suzuki DS80 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.