How to Change the Oil in a 2019 Sherco 125SE-R

Shop parts for a 2019 Sherco 125SE-R Dirt Bike.

Changing the transmission oil in your 2019 Sherco 125SE-R is a key maintenance task to keep the gearbox running smoothly and extend the life of your dirt bike. This step-by-step guide is tailored specifically for this model and proprietary to MotoSport.com, covering the required tools, a precise procedure, and important call-outs every 125SE-R owner needs to know.

Tools You Will Need

  • 8mm socket
  • 17mm socket
  • 4mm Allen wrench (for most Sherco drain plugs)
  • Drain pan (oil collection)
  • Protective gloves
  • Rag or paper towels
  • Degaussing cleaner or degreaser (for drain plugs)
  • Replacement crush washers (aluminum)
  • Funnel (optional, for easier refill)
  • Torque wrench

Consumables

  • SAE 10W-40 motorcycle oil – 0.5 liters

Before You Start

  • Make sure the engine is warm before draining the oil. This helps oil flow fully from the gearbox and suspends contaminants.
  • Work in a well-ventilated area with the bike on a level surface, ideally using a stand.
  • Use gloves to protect your hands from hot oil and chemicals.

Steps to Change the Oil

  1. Remove the Skid Plate: The Sherco 125SE-R has a skid plate protecting the engine sump. Remove it to access the drain bolts as per the owner's manual.
  2. Position the Bike: Set the bike upright, balancing it securely or using a proper maintenance stand.
  3. Prepare Your Tools and Drain Pan: Place the drain pan beneath the engine to catch used oil.
  4. Remove Both Drain Bolts:
    • Locate and remove drain bolt 1 and drain bolt 2 underneath the engine. Both bolts need to be removed for complete drainage on this model. They are marked on the engine case and typically require a 17mm socket.
    • The gearbox uses two drain points—ensure both bolts (with aluminum crush washers) are removed for a thorough oil change.
    • Let oil drain completely; this takes several minutes.
  5. Clean and Inspect Drain Bolts:
    • Wipe down both drain bolts and their seats using degreaser and a rag.
    • Magnetic drain plugs may collect metal shavings; clean thoroughly.
    • Inspect and replace crush washers if flattened or damaged.
  6. Reinstall Drain Bolts:
    • Reinstall bolts 1 and 2. Torque each to 15 Nm as specified by Sherco. Do not overtighten—damaging the crankcase or stripping threads is common if not properly torqued.
  7. Remove the Oil Fill Plug:
    • Locate the oil fill plug on the engine case. This is usually marked with OIL and often requires an 8mm or 4mm Allen wrench.
    • Remove the plug and set aside.
  8. Add New Oil:
    • Pour in 0.5 liters (500 ml) of SAE 10W-40 motorcycle oil. Use a funnel to avoid spilling oil onto the engine, especially since the fill port can be positioned in a tight area.
  9. Check Oil Level:
    • Replace the filler plug and secure firmly, but do not overtighten. Stand the bike upright and check the oil level per the owner's manual if a sight glass or dipstick is provided.
  10. Reinstall the Skid Plate: Replace the skid plate and tighten securely.
  11. Dispose of Used Oil Properly: Bring old oil to a recycling center or proper waste facility. Do not dispose of in drains or on the ground.

Specific Model Call-Outs for 2019 Sherco 125SE-R

  • Drain plug torque: Always use a torque wrench set to 15 Nm for drain bolts to avoid stripping the soft aluminum case.
  • Drain bolt locations: This bike has two drain bolts – both must be removed for a complete oil change. Missing one bolt will leave old oil in the system, risking contamination and wear.
  • Crush washers: The Sherco uses replaceable aluminum crush washers. While many riders use them more than once, replacement is recommended at each change for best sealing.
  • Oil fill access: The refill port location can be tight, requiring patience or a flexible funnel for easier pouring.
  • Recommended oil: Use only SAE 10W-40 as specified—using incorrect viscosity may harm shifting and bearing life.
  • Change interval: Sherco recommends the first oil change at 5 hours, and thereafter at intervals based on usage. Hard racing or dirty conditions require more frequent changes.
  • Environmental note: Oil and filters must always be disposed of at a proper collection center.

Final Checks

  • Start the engine briefly after changing oil, then check drain plugs and the fill port for leaks.
  • Recheck oil level and top off if necessary.
  • Consult the owner's manual or a Sherco dealer for any model-specific questions not covered here.

Performing regular oil changes on your 2019 Sherco 125SE-R will keep the gearbox transmission running reliably—just be sure to follow the procedures outlined, use the correct tools, and double-check for leaks. For all your dirt bike parts and tools, trust MotoSport.com for premium supplies and expertise.

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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.