How to Change the Oil in a 2018 Husqvarna TC125

Shop parts for a 2018 Husqvarna TC125 Dirt Bike.

Regular gear oil changes are essential for maintaining the performance and longevity of your 2018 Husqvarna TC125 dirt bike. Below you'll find a robust, step-by-step guide specific to your bike, including a detailed list of tools required, the complete oil change process, and important model-specific tips you should not overlook.

Tools and Supplies Needed

  • Socket wrench or box wrench (13mm recommended)
  • Oil drain pan
  • Clean rags or paper towels
  • New gear oil (15W/50 recommended, 0.80 liters or 0.85 quarts)
  • Replacement crush washer/seal ring for drain plug
  • Funnel (optional, for clean pouring)
  • Torque wrench (set to 15 Nm or 11.1 lb-ft for drain plug)
  • Parts cleaner or brake cleaner (for cleaning the drain plug)
  • Safety gloves

Step-by-Step Guide: Oil Change Process

  • Warm up the engine for 2–3 minutes. This helps the oil flow out more easily.
    • If the engine is cold, the oil can be sluggish and not drain fully.
  • Turn off the bike and place it on a stable stand. Make sure the bike is upright or as close to level as possible for best draining.
  • Clean around the drain plug and oil fill cap to keep debris from getting in the engine.
  • Locate the drain plug on the bottom of the engine. Use a 13mm box wrench or socket to remove the drain plug and allow the old oil to drain completely into your oil pan.
    • Be cautious: The oil may be hot if the engine was recently running.
    • Remove the oil fill cap to help the process go faster.
  • Remove and inspect the drain plug. The plug usually has a magnet to catch metallic debris.
    • Thoroughly clean the drain plug and check for metal shavings—some minor particles are typical, but excessive shavings may indicate internal wear.
  • Replace the crush washer/seal ring on the drain plug if it's worn or damaged. This ensures a watertight seal and prevents leaks.
  • Clean the sealing area on the engine where the drain plug sits and wipe it dry before reinstalling the plug.
  • Reinstall the drain plug by hand, then tighten with a torque wrench to 15 Nm (11.1 ft-lb) as specified for the TC125.
    • Do not overtighten, as this could strip the threads or crack the case.
  • Refill with fresh gear oil by pouring 0.80 liters (0.85 quarts) of 15W/50 oil into the oil fill opening.
    • A funnel helps avoid spills.
    • Do not overfill; too much oil can cause foaming and transmission issues.
  • Replace the oil fill cap and wipe down any drips or excess oil.
  • Start the engine and let it idle for a minute. Shift through the gears to circulate the oil.
  • Check for leaks at the drain plug and around the fill cap. If you see oil seeping out, immediately shut down and retighten as necessary.
  • Inspect oil level (if your model has a sight glass or dipstick). Top up if necessary but do not exceed the indicated level.

2018 Husqvarna TC125-Specific Call-Outs

  • The 2018 TC125 uses a gear oil capacity of 0.80 liters (0.85 quarts) and takes 15W/50 synthetic engine oil

    .
  • Check the sealing washer every oil change—failure to replace can cause leaks specific to the TC125's lightweight aluminum case design

    .
  • The drain plug is magnetic. Always inspect for excessive metal debris—a sign of potential transmission or gear issues

    .
  • Always torque the drain plug correctly (15 Nm/11.1 ft-lb). Over-tightening can crack the case, which is a common problem if incorrect tools are used on the TC125 platform.
  • Make sure only the recommended gear oil is used (not standard 4-stroke engine oil), as the 2-stroke transmission relies on proper friction characteristics for optimal clutch performance.

Additional Tips

  • Dispose of old oil at a local recycling center—do not pour on the ground or in drains.
  • Inspect your bike for possible leaks or other maintenance needs while you have tools out.
  • Keep a maintenance log with dates and hours for every oil change. This helps track intervals and maintain resale value.

Performing regular oil changes exactly as specified helps keep your 2018 Husqvarna TC125 running strong and shifts smooth for the life of your bike. Always refer to your owner’s manual for any updated procedures or capacities, as specifications may vary with riding conditions and operating hours.

Related Shopping Categories

Shop Motor Oil for a 2018 Husqvarna TC125 Dirt Bike.

Shop Oil Filters for a 2018 Husqvarna TC125 Dirt Bike.

Shop Oil Drain Pans for a 2018 Husqvarna TC125 Dirt Bike.

Shop Tools for a 2018 Husqvarna TC125 Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2018 Husqvarna TC125 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.