How to Change the Oil in a 2007 Suzuki RM125 – Step-by-Step Guide
Changing the transmission oil in your 2007 Suzuki RM125 is a crucial maintenance task that keeps your dirt bike's gearbox running smoothly and extends its lifespan. This guide is exclusive to MotoSport.com and covers everything you need: required tools, step-by-step instructions, and vital model-specific notes.
Tools & Supplies Needed
- Socket wrench set (with metric sockets)
- Torque wrench
- Drain pan
- Funnel
- Measuring cup (for 750 ml)
- Shop rags
- New SAE 10W-40 transmission oil (Capacity: 750 ml)
- Gloves (optional, for cleanliness)
Step-by-Step Instructions
-
Warm Up the Engine
- Start your RM125 and let it idle for a few minutes. This helps the oil become less viscous, allowing it to drain more thoroughly and carry away debris trapped in the transmission.
-
Stabilize the Bike
- Place the motorcycle on level ground and hold it vertically upright. A bike stand is helpful but not strictly necessary if you can keep the bike steady.
-
Remove the Oil Filler Cap
- Unscrew the oil filler cap to allow air in, which helps oil flow smoothly out during draining.
-
Drain Old Transmission Oil
- Position your drain pan under the transmission drain bolt.
- Using your socket wrench, remove the drain plug carefully to let the old oil drain completely.
- Allow several minutes for all oil to escape, tilting the bike slightly side to side if necessary.
-
Inspect & Reinstall the Drain Plug
- Check the condition of the drain plug and its seal/washer.
- Clean the magnet (if equipped) of metal shavings.
- Reinstall the drain plug, torquing to 21 N·m (14.5 lb-ft) as specified for the 2007 RM125.
-
Add New Transmission Oil
- Insert a funnel into the oil filler port.
- Pour in 750 ml (0.8 US qt) of SAE 10W-40 oil meeting API SF/SG/SH/SJ and JASO MA specifications. Do not overfill; carefully measure the volume.
- Reinstall and tighten the filler cap securely.
-
Run & Check Oil Level
- Start the bike, let it run for a couple of minutes, then shut it off and let sit for three minutes.
- Check oil level at the oil level bolt (located on the side of the engine). Oil should just begin to dribble from the bolt when the level is correct.
- If no oil escapes, add small amounts until it does, then replace and tighten the oil level bolt to 5.5 N·m (4.0 lb-ft).
-
Inspect for Leaks & Clean Up
- Wipe away any residual oil and check for drips or leaks around the plugs and filler cap.
- Dispose of old oil responsibly at an appropriate recycling center.
2007 Suzuki RM125 Model-Specific Call-Outs
- This bike is a two-stroke and does not use a conventional crankcase engine oil; you are changing transmission oil only as part of regular maintenance.
- Always use oil that meets JASO MA specifications to prevent clutch slippage.
-
The drain plug and oil level bolt torque values are essential to prevent leaks or damage:
- Drain plug: 21 N·m (14.5 lb-ft)
- Oil level bolt: 5.5 N·m (4.0 lb-ft)
- Oil quantity is 750 ml for a standard change, or 800 ml if the engine has been fully overhauled.
- Always check your owner's manual for additional recommendations and verify no updates have been issued for your model year.
Tips for Best Results
- Change your RM125 transmission oil every every 5–10 hours of use or after riding in severe/extreme conditions.
- Take photos during the process the first time as a reference for future oil changes.
- Clean the area around the drain and filler plugs before removal to prevent dirt from entering the engine.
Performing regular transmission oil changes on your 2007 Suzuki RM125 protects your investment and ensures your dirt bike performs at its best every ride.
All content proprietary to MotoSport.com
Related Shopping Categories
Shop Motor Oil for a 2007 Suzuki RM125 Dirt Bike.
Shop Oil Filters for a 2007 Suzuki RM125 Dirt Bike.
Shop Oil Drain Pans for a 2007 Suzuki RM125 Dirt Bike.
Shop Tools for a 2007 Suzuki RM125 Dirt Bike.
Shop Oil Fillers and Drain Plugs for a 2007 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.