How to Change the Oil in a 1981 Suzuki RM60

Shop parts for a 1981 Suzuki RM60 Dirt Bike.

If you own a classic 1981 Suzuki RM60, regular oil changes are crucial for optimal performance & longevity. While the RM60 is a two-stroke dirt bike and does not have crankcase engine oil like a four-stroke, it does require transmission oil changes. This guide — proprietary to MotoSport.com — provides detailed, expert instructions for safely and effectively changing the gearbox oil, highlighting specific considerations for your RM60.

Tools and Supplies Needed

  • Socket wrench set (usually 10mm and 12mm are common; confirm on your bike)
  • Drain pan or oil receptacle
  • Replacement transmission oil (consult owner's manual, but 10W-40 motorcycle-specific oil or 80W gear oil is standard for vintage two-strokes)
  • Funnel
  • Clean rags or shop towels
  • New crush washer for drain bolt (recommended)
  • Torque wrench (optional but recommended for re-tightening the drain bolt)
  • Service manual or specs sheet (always helpful for exact quantities and torque figures)

Specific Notes for the 1981 Suzuki RM60

  • The 1981 RM60 uses a separate transmission oil system, unlike four-strokes which have a shared engine/transmission oil.
  • This bike has a single drain bolt on the bottom of the transmission/crankcase.
  • There is no oil filter to change on the RM60; focus solely on draining and refilling the gearbox.

Step-by-Step Instructions

  • Warm up the bike briefly (about 2-3 minutes). Warmed oil flows out faster and suspends contaminants better. Do not overheat or run the bike indoors.
  • Secure the bike on a stand or level surface so it sits upright and stable.
  • Place your drain pan directly beneath the drain bolt. Consult your service manual for the exact location, typically centered at the lowest point of the crankcase.
  • Loosen and remove the drain bolt (often 12mm socket). Allow oil to drain completely. Be careful if the oil is warm.
  • Examine the old oil. If it's silvery (metallic), that may indicate wear. Milky oil can mean water intrusion – if so, investigate further before refilling.
  • Clean the drain bolt. Inspect or replace the crush washer for a tight seal.
  • Reinstall the drain bolt and tighten it snugly. Do not overtighten – use a torque wrench if possible, following manual specs to avoid stripping.
  • Remove the transmission oil fill cap (on clutch cover side, usually a large plastic or metal cap).
  • Add new oil using a funnel. Quantity is typically about 650ml (check your manual for exact volume). Avoid overfilling.
  • Replace the fill cap and wipe up any spills. Ensure there are no leaks around the drain bolt.
  • Start the engine and let it idle for a minute, moving the bike through the gears gently if possible (with rear wheel off the ground on a stand). This helps the new oil circulate.
  • Check oil level using the sight window or dipstick if equipped (not all models have this). Add more oil if necessary, being careful not to overfill.

1981 Suzuki RM60-Specific Callouts

  • The RM60's transmission is simple; just one oil drain bolt and one fill cap.
  • There is no oil filter to service on the RM60.
  • Always use oil recommended for wet clutches – regular automotive oils can cause clutch slippage.
  • Vintage RM60s have some bolt and case fragility; use proper torque settings to prevent damage to crankcase threads.
  • Replace OEM aluminum crush washers periodically to avoid leaks.
  • Check for fuel or coolant leaks into the crankcase (unusual but possible in old bikes).

Pro Tips from MotoSport.com

  • Collect the used oil in a sealed container and recycle it at a proper facility.
  • Consider flushing old or contaminated oil with a small amount of fresh oil before a full fill if you suspect debris inside.
  • Document the oil change in your maintenance log – a simple note of date and hours run helps track engine health.
  • Inspect clutch adjustment while you're changing oil, since clutch issues can often masquerade as oil or gearbox problems.
  • Keep extra crush washers and transmission oil on hand for future changes.

Reliable Resources for the RM60 Owner

  • The Haynes/Clymer Repair Manual for the RM60 (1979–1981) provides diagrams and step-by-step visuals for all maintenance, including oil changes. These resources can be invaluable for first-time and seasoned owners alike .
  • MotoSport.com stocks parts and supplies specifically for the 1981 RM60, including recommended transmission oils — always use products formulated for two-stroke gearboxes .

Changing the oil in your 1981 Suzuki RM60 is straightforward but essential. Treat every oil change as an opportunity to inspect, maintain, and connect with your vintage machine. For more detailed parts and model-specific guidance, MotoSport.com is your source for everything dirt bike.

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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.