How to Change the Oil in a 2006 Suzuki RM250

Shop parts for a 2006 Suzuki RM250 Dirt Bike.

Regular oil changes are crucial for maintaining the performance and longevity of your 2006 Suzuki RM250. This guide from MotoSport.com will walk you through the step-by-step process, list the exact tools you'll need, and highlight model-specific tips you won't find anywhere else. The RM250 is a two-stroke dirt bike but requires regular transmission oil changes to keep shifting smooth and internals protected. Follow these steps for a successful oil change every time.

Tools and Materials You'll Need

  • Socket wrench set (10mm and 12mm sizes)
  • Allen wrench/hex key set (for the oil check bolt)
  • Drain pan (for old oil)
  • Measuring cup or graduated oil jug
  • Funnel
  • Clean rags
  • New transmission oil (10W-40 motorcycle-specific recommended)
  • Torque wrench (for precise tightening)
  • Replacement drain washer (optional, if current washer is damaged)

Preparation

  • Warm up the motorcycle for a few minutes. This allows oil to drain more completely.
  • Shut off the engine and ensure the bike is on a stable, level surface, ideally using a bike stand.
  • Refer to your manual for proper identification of all bolts and check specifications if unsure.

Step-by-Step Oil Change Instructions

  1. Locate the Oil Filler Cap, Drain Plug, and Oil Check Bolt
    The filler cap is on top of the transmission case. The oil drain plug is found underneath the engine. The oil check bolt is hidden behind the chain guard—remove the guard, move aside the wires, and look for an Allen bolt behind them. This unique placement is a known RM250 quirk and trips up many owners the first time[2].
  2. Drain the Old Oil
    • Place the drain pan directly beneath the drain plug.
    • Remove the oil filler cap to allow quicker draining.
    • Use a socket wrench to remove the drain plug and allow oil to fully drain into the pan.
    • Inspect the crush washer on the drain plug; replace if damaged.
    • After draining, re-install and torque the drain plug to 21 N–m (15.0 lb-ft)[4].
  3. Checking Oil Level Bolt
    • Remove the Allen key oil check bolt (behind the chain guard and some wires).
    • This allows you to confirm the oil level during filling.
  4. Refill with New Oil
    • Pour in 750ml (0.8 US qt) of 10W-40 motorcycle transmission oil through the filler cap opening[4].
    • Pour slowly and use a funnel to avoid spills.
    • Do not overfill. The RM250 is sensitive to oil quantity and overfilling can cause leaks or clutch issues.
    • If you're doing a complete engine overhaul, use 850ml (0.9 US qt) instead.
    • Wait a minute, then re-insert the oil check bolt and confirm oil is seeping from the bolt hole (it is at the correct level if a small amount comes out). If none comes out, add a little more oil and wait. Once it seeps, stop.
    • Reinstall and tighten the oil check bolt securely.
  5. Finishing Steps
    • Reinstall the filler cap.
    • Wipe down any spilled oil with rags.
    • Run the engine for a minute, then shut it off and check the transmission for leaks.
    • Re-check oil level with the oil check bolt if you want optimal accuracy.

Model-Specific Call-Outs for the 2006 Suzuki RM250

  • Transmission Oil Only: The RM250 is a two-stroke, so you are only changing the transmission oil, not engine oil.
  • Oil Check Bolt Position: It's notoriously tough to find unless you know it's behind the chain guard and some wires. Remove these to access it[2].
  • Oil Quantity: Overfilling or underfilling the transmission can result in clutch or shifting problems. Always measure oil accurately.
  • Washer Inspection: The drain plug washer often gets overlooked. A damaged washer will cause slow leaks and dirt ingress.
  • Tightening Spec: The drain plug should be tightened to 21 N–m (15.0 lb-ft)[4].

Disposal and Final Checks

  • Recycle your old oil at an approved facility. Never dump oil on the ground or in household trash.
  • Check for smooth shifting after your next ride.
  • Change the oil every 10–15 hours of riding, or more frequently if you ride hard or in muddy conditions.

An oil change on the 2006 Suzuki RM250 is relatively straightforward, but paying attention to these Suzuki-specific call-outs and torque specs will help you avoid the most common mistakes. For genuine parts and recommended lubricants, MotoSport.com always has you covered for two-stroke maintenance supplies and expert dirt bike advice.

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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.