How to Change the Oil in a 2006 Suzuki RM125

Shop parts for a 2006 Suzuki RM125 Dirt Bike.

If you own a 2006 Suzuki RM125, performing regular oil changes is crucial for the health of your dirt bike's transmission and clutch. This step-by-step guide will walk you through the entire process and highlight Suzuki RM125-specific details riders should consider. Designed for MotoSport.com customers, this tutorial ensures your maintenance routine is both efficient and thorough.

Tools and Supplies Needed

  • 10mm and 12mm socket or wrench
  • Oil drain pan
  • Funnel
  • Clean shop rags
  • Measuring cup (Ratio Rite style recommended)
  • Torque wrench
  • Replacement crush washer (optional but recommended)
  • SAE 10W-40 or equivalent, JASO MA-rated motorcycle oil
  • Gloves

Preparation

  • Have all tools and supplies on hand before you begin.
  • Warm up the engine for 2–3 minutes. This helps old oil drain faster and more completely.
  • Place the motorcycle upright on a level surface to ensure correct oil level when refilling.

Draining the Oil

  • Using the correct sized socket, remove the transmission oil filler cap from the right side of the engine.
  • Position the drain pan under the bike, directly beneath the oil drain plug (bottom left side of the crankcase).
  • Using a socket or wrench, carefully loosen and remove the oil drain plug. Allow the used oil to drain completely.
  • Inspect the drain plug for debris, and replace the crush washer if needed. Clean any sediment or dirt from the magnet and threads.

Installing the Drain Plug

  • Reinstall the drain plug by hand to avoid cross-threading, then torque to 21 N·m (2.1 kgf-m, 14.5 lb-ft) as specified for the 2006 RM125.1
  • Wipe away any oil residue around the plug and case.

Adding New Transmission Oil

  • Using a Ratio Rite cup or measuring device, measure out exactly 750 ml (0.8 US qt / 0.7 Imp qt) of fresh SAE 10W-40 motorcycle oil.1
  • Insert the funnel into the oil fill port, then carefully pour in all the oil.
  • Replace the filler cap and ensure it is secure.

Oil Level Check and Final Steps

  • Start the engine and let it run for 2–3 minutes. Shut down and wait 1–2 minutes to allow the oil to settle.
  • Remove the oil level check bolt (typically a small bolt located near the clutch cover, just below the fill cap). The bike should be upright and level.
  • If oil seeps out of the check bolt hole, the level is correct. If not, add a small amount of oil at a time and recheck.
  • Reinstall and torque the oil level bolt to 5.5 N·m (0.55 kgf-m, 4.0 lb-ft).1
  • Wipe all surfaces clean, verifying there are no drips or leaks.

2006 Suzuki RM125 Specific Tips

  • The RM125 is a two-stroke, so engine oil is not part of this procedure—this is for transmission/clutch oil only.2
  • Always use JASO MA-rated oil to ensure clutch compatibility.1
  • Do not overfill: Overfilling can cause increased clutch drag or leaks. Precisely measure the new oil.
  • Be careful not to overtighten the drain or check bolts; use a quality torque wrench to avoid thread damage.1
  • Replace the oil regularly, especially after heavy use or water crossings.

Disposal

  • Take the used oil to a local recycling center or auto parts shop. Do not dump used oil in the trash or on the ground.

Conclusion

Changing the oil on your 2006 Suzuki RM125 is a straightforward process if you follow the proper steps and torque specs. Routine maintenance like this keeps your bike running strong and extends the life of your clutch and transmission. For OEM and aftermarket parts, visit MotoSport.com for the best selection and support.

References:
1. Suzuki RM125 Owner's Service Manual – Transmission Oil Change Procedures.
2. Suzuki RM125K4 Service Manual, Fuel and Oil Recommendation Section.
3. Video procedures offer additional visual support for steps on similar RM125 models.

Related Shopping Categories

Shop Motor Oil for a 2006 Suzuki RM125 Dirt Bike.

Shop Oil Filters for a 2006 Suzuki RM125 Dirt Bike.

Shop Oil Drain Pans for a 2006 Suzuki RM125 Dirt Bike.

Shop Tools for a 2006 Suzuki RM125 Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2006 Suzuki RM125 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.