How to Change the Oil in a 1979 Suzuki RM60

Shop parts for a 1979 Suzuki RM60 Dirt Bike.

Keeping your vintage 1979 Suzuki RM60 running strong requires regular oil changes. This simple maintenance extends the life and performance of your 2-stroke dirt bike, and with the right tools and steps, you can do it yourself at home. Below you'll find a step-by-step guide developed exclusively for MotoSport.com, including all tools required and critical tips specifically for the 1979 RM60.

Tools and Supplies Needed

  • Socket wrench set (including 17mm or 19mm socket, depending on your drain bolt size)
  • Oil drain pan
  • Plastic funnel
  • Rags or shop towels
  • New transmission oil (SAE 10W-40 motorcycle transmission oil or oil specified for 2-stroke gearboxes)
  • Torque wrench (recommended for proper bolt tightening)
  • Parts cleaning brush (optional, for cleaning surrounding area)
  • Replacement washer/gasket for the drain bolt (recommended)
  • Service manual or specs chart for RM60 (for specified oil volume)

Preparation Steps

  • Fill your RM60’s gas tank and run the engine for a few minutes to warm the oil. Warm oil drains more thoroughly and carries away more contaminants.
  • Turn off the motorcycle and place it on a stable stand or secure it upright for safe access to the drain bolt and filler cap.

Changing the Oil: Step-By-Step

  1. Locate the drain plug:– Find the oil drain bolt underneath the transmission casing; typically on the lowest point of the casing. Consult your service manual or inspect the bottom of the engine. Place the drain pan directly below this plug.
  2. Remove the oil filler cap: This allows oil to flow out more easily by letting air in as you drain the system.
  3. Remove the drain bolt: Use your wrench to loosen and remove the transmission oil drain plug. Let all the old oil flow into the pan. Expect transmission oil to be dark and possibly pungent.
  4. Inspect drained oil: Look for signs of metal shavings, water, or excessive debris. Small amounts of fine metal particles are normal in 2-stroke gear oil, but metal chunks or a milky appearance suggest potential transmission issues.
  5. Replace the drain bolt washer/gasket: Install a new copper or fiber washer to help seal the plug and prevent leaks.
  6. Reinstall the drain bolt: Clean the threads and tighten the drain bolt securely using a torque wrench if possible, referencing your RM60’s spec (usually 14–21 Nm for similar Suzuki models—the RM60’s original manual should verify the spec).
  7. Add new oil: Using your funnel, fill the transmission case with fresh SAE 10W-40 motorcycle oil (or transmission oil rated for 2-stroke gearboxes). For the 1979 RM60, the typical oil capacity is approximately 600 ml (20.3 oz), but confirm with your owner’s manual or a reputable spec sheet. Do not overfill.
  8. Check the oil level: Some models feature a check bolt or sight glass; others require checking by standing the bike level and filling until the oil just reaches the bottom of the fill hole. Wipe up any spills.
  9. Reinstall and tighten filler cap: Make sure the oil filler cap is snug and wipe any stray oil from the engine case.
  10. Run the engine briefly: Start the bike and let it idle for a minute, then switch it off and check for leaks at the drain and fill plug. Top off as needed.
  11. Dispose of used oil: Properly recycle the old oil at a local collection point.

Special Call-Outs for the 1979 Suzuki RM60

  • Transmission Oil Only: The RM60 is a 2-stroke dirt bike. It does not use engine oil to lubricate the crankshaft since its fuel/oil mixture is handled via the carburetor and fuel tank. The oil you change is for the transmission and clutch only.
  • Capacity Caution: Do not overfill. Too much oil can cause transmission drag and clutch issues, while too little can lead to gear wear or seizure.
  • Check for leaks and gasket wear: Given the age of the machine, gaskets or seals may have hardened or shrunk. Always check seal surfaces and consider replacing the fill/drain plug gasket at each oil change.
  • Use the correct oil type: Avoid using standard automotive oil. Use motorcycle-specific, wet-clutch compatible oil (JASO MA recommended) to prevent clutch slippage and ensure proper transmission life.
  • Periodic Inspection: Changing oil every 8–10 hours of riding or at least once a season is recommended, especially due to the small case volume in classic minis like the RM60.

Additional Tips

  • Consult your service manual for exact torque specs and procedures specific to the 1979 Suzuki RM60 before starting.
  • Keep a maintenance log of each oil change for future reference.
  • Wear nitrile gloves and safety glasses when working with used oil.

Performing regular oil changes on your 1979 Suzuki RM60 is essential maintenance that keeps this legendary mini-motocrosser at peak performance. For more exclusive guides, parts, and maintenance essentials for your dirt bike, trust MotoSport.com—your authority in motocross service and supplies.

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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.