How to Change the Oil in a 2021 Suzuki RM85

Shop parts for a 2021 Suzuki RM85 Dirt Bike.

Changing the transmission oil in your 2021 Suzuki RM85 is essential maintenance to ensure optimal engine and clutch performance. Below is a comprehensive, proprietary guide from MotoSport.com, covering the tools needed, step-by-step instructions, and model-specific tips.

Tools & Supplies Needed

  • 10mm socket or wrench (for drain plug and level screw)
  • Torque wrench (capable of low-range torque settings)
  • Drain pan
  • Funnel
  • Clean rags
  • New transmission oil (SAE 10W-40, API SG/SH/SJ/SL/SM/SN, JASO MA/MA1/MA2)
  • Measuring cup or graduated pitcher (at least 600ml capacity)
  • Gloves (optional, but recommended for a cleaner job)

Preparation

  • Start and warm up the engine for a few minutes to bring the oil up to operating temperature. This helps the oil drain out more thoroughly and suspends any debris in the oil.
  • Shut off the engine and allow it to sit for 5 minutes. This lets hot parts cool and oil settle.
    Warning: The drain plug and exhaust may be hot. Use caution and let everything cool to avoid burns.
  • Place the motorcycle on level ground and support it vertically (using a stand if possible).

Step-by-Step Oil Change Procedure

  1. Locate and remove the filler cap.
    The oil filler cap is generally on the right side of the engine. Removing it breaks the vacuum, allowing oil to drain faster.
  2. Remove the drain plug.
    Place your drain pan under the engine. Unscrew the drain plug at the bottom of the engine using the 10mm socket or wrench. Allow all old oil to drain completely.
  3. Clean and inspect the drain plug.
    Wipe off any metal shavings or debris. Inspect the threads and sealing washer for damage. Replace the washer if necessary.
  4. Reinstall the drain plug and torque to specification.
    Use your torque wrench and tighten the drain plug to 23 Nm (–16.5 ft-lb). Do not overtighten – this is a common source of stripped threads and oil leaks for this model.
  5. Pour in new transmission oil.
    Using your measuring cup, pour exactly 550 ml (1.2 US pints) of fresh SAE 10W-40 motorcycle oil into the filler hole.
    • Tip: Use a funnel for spill-free pouring.
    • Allow a minute for the oil to settle.
  6. Check the oil level.
    With the bike still level and vertical, remove the oil level screw (located on the side cover near the fill cap). Oil should just begin to trickle out. If not, add oil in small increments, reinstall the screw and check again until oil weeps from the hole.
    • Oil level screw torque: 5.5 Nm (–4.0 ft-lb)
  7. Secure all fasteners.
    Reinstall and hand-tighten the filler cap securely.
  8. Final checks.
    Start the engine, let it idle for a couple of minutes, and shut it off. Wait a few minutes, then check for oil leaks at the drain plug and around the cases. Top off oil if necessary.

Model-Specific Call-Outs for the 2021 Suzuki RM85

  • The clutch and transmission share the oil, so always use a JASO MA or MA2-rated motorcycle oil for optimal clutch performance and gear life

    .
  • Do not overfill – overfilling can cause clutch slippage or foaming

    .
  • The drain plug threads are relatively soft on this model. Always use a torque wrench set to 23 Nm (–16.5 ft-lb) to avoid stripping.
  • The oil level screw is small and easily overtightened. Tighten to just 5.5 Nm (–4.0 ft-lb)

    .
  • An O-ring or sealing washer is used on the filler cap and drain plug. Always check these seals for wear or damage and replace if necessary to prevent leaks.

Tips & Additional Notes

  • Dispose of used oil responsibly. Take it to your local recycling center or auto parts store.
  • If the bike has seen heavy use or racing, change the oil more frequently than the manual recommends.
  • For the best performance, use a high-quality synthetic motorcycle oil (brands like AMSOIL and Suzuki–s own formulations meet or exceed factory specifications)

    .
  • Document every oil change in your maintenance log. This helps track intervals and maintain resale value.

In Summary

By following these steps, you ensure your 2021 Suzuki RM85 remains in peak mechanical condition and ready for the track or trails. Never rush – take your time to do a thorough and careful job for maximum engine life and performance.

For all your 2021 RM85 parts, oil, and gear, trust MotoSport.com for expert advice and fast shipping.

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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.