How to Change the Oil in a 2013 KTM 250SX — Step-by-Step Guide

Shop parts for a 2013 KTM 250SX Dirt Bike.

This how-to is proprietary to MotoSport.com and covers the oil change procedure for the 2013 KTM 250SX two-stroke dirt bike, with model-specific tips and call-outs.

Tools and Supplies Needed

  • 8mm T-handle or socket wrench
  • Torque wrench (capable of 14.8 ft-lb or 20 Nm)
  • Large oil catch pan
  • New crush washer for drain plug
  • Shop towels or rags
  • Fresh transmission oil (KTM recommends 0.8L of high-quality transmission oil, such as Motorex 10W40)
  • Funnel
  • Pliers (for snugging the fill cap, per KTM guidance)
  • Parts cleaner or brake/carb cleaner spray (optional, for cleaning spills)
  • Gloves (recommended)

Preparation

  • Warm up the engine for a few minutes to help the oil flow freely, then shut off the bike and allow it to cool slightly for safe handling. Warm oil drains more thoroughly but can be very hot—exercise caution.
  • Ensure the bike is upright and secure on a stable stand for safe access and to prevent spills.

Step-by-Step Procedure

  1. Remove the Oil Fill Cap
    Unscrew and remove the oil fill cap (usually located on the right side of the clutch cover). This step helps air flow and allows the oil to drain more completely.
    Tip: Place the cap somewhere clean to avoid contamination.
    Model-Specific Call-Out: On the 2013 KTM 250SX, the oil fill cap threads can be easily cross-threaded. Always start the cap by hand to avoid damage.
  2. Drain the Oil
    Place your drain pan directly underneath the engine. Using your T-handle or socket, remove the drain plug on the underside of the case.
    Tip: The oil may come out forcefully at first—be ready.
    Model-Specific Call-Out: The 250SX uses a magnetic drain plug to help catch debris. Clean off any particles from the tip—small amounts are normal.
  3. Check and Replace the Crush Washer
    Every oil change, inspect the aluminum crush washer on the drain plug. If deformed or grooved, replace it to prevent leaks.
  4. Reinstall and Torque the Drain Plug
    Install the cleaned drain plug and new washer. Tighten with a torque wrench to 14.8 ft-lb (20 Nm)—do not overtighten, as it may strip the case or damage threads.
    Model-Specific Call-Out: On older KTM 250SX models, overtightening is a common cause of stripped cases due to soft aluminum. Use a torque wrench.
  5. Fill with New Oil
    Using a funnel, pour in 0.8 liters of fresh transmission oil as recommended by KTM. Go slow to avoid overflowing.
    Tip: Wipe any spills immediately with rags and spray cleaner if necessary.
  6. Install the Oil Fill Cap
    Replace the oil fill cap. Use pliers to snug it up as per KTM's recommendation—just a bit more than hand-tight. This ensures the cap stays secure during riding.
    Model-Specific Call-Out: The KTM 250SX fill cap has a tendency to work loose under vibration. KTM advises a "snug" fit using pliers, not just by hand.
  7. Check for Leaks
    Wipe all bolt areas clean with a rag. Start the bike and let it idle for a minute. Shut it off and closely inspect the drain and fill areas for any sign of oil seepage. If observed, recheck torque on drain plug and cap.
  8. Record Hours or Mileage
    For best maintenance, log the oil change and your engine hours. For trail riding, KTM recommends changing oil every 3-5 hours, more often under severe or race conditions.

Model-Specific Notes and Call-Outs for 2013 KTM 250SX

  • Only the gearbox/transmission oil is changed—this is a two-stroke model; it does not share oil with the crankcase.
  • No oil filter needs replacement during an oil change, unlike four-stroke models.
  • The drain plug is magnetic, designed to catch metallic particles—clean it every oil change.
  • Regularly inspect the transmission oil: two-strokes can get contaminants from clutch fibers and gearbox wear—supervision is vital for longevity.

Pro Tips from MotoSport.com

  • Store your drain plug and fill cap in designated hardware trays during the process—metal shavings or dirt can contaminate your system if left on the ground or a dirty shop bench.
  • Use high-quality transmission-specific oil, not motor oil or ATF. The right oil keeps your clutch and gears in peak shape.
  • Don't overtighten. A torque wrench is your friend. Stripped cases are expensive to repair and easily avoided with proper tools.
  • Always use a new crush washer. Reusing the old one is the most common cause of sneaky leaks on the 2013 KTM 250SX.

Final Checklist

  • Bike warmed up and safely secured
  • All tools and supplies ready
  • Engine oil fully drained and disposed of properly
  • Drain plug clean, new washer installed, torqued to spec
  • Oil fill cap installed and snugged with pliers
  • Oil added to specified volume (0.8L)
  • Leaks checked after running engine
  • Service interval logged

Follow these steps to keep your 2013 KTM 250SX running strong. For more OEM maintenance parts, technical diagrams, and expert advice, trust MotoSport.com—your authority in dirt bike care and performance.

Related Shopping Categories

Shop Motor Oil for a 2013 KTM 250SX Dirt Bike.

Shop Oil Filters for a 2013 KTM 250SX Dirt Bike.

Shop Oil Drain Pans for a 2013 KTM 250SX Dirt Bike.

Shop Tools for a 2013 KTM 250SX Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2013 KTM 250SX 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.