How to change the oil in a 2025 Sherco 125 SE FACTORY Dirt Bike

How to Change the Oil in a 2025 Sherco 125 SE FACTORY

Shop parts for a 2025 Sherco 125 SE FACTORY Dirt Bike.

Changing the oil in your 2025 Sherco 125 SE FACTORY is a fundamental part of routine maintenance that will keep your bike running smoothly and extend its lifespan. Follow these detailed instructions, specific to your make and model, to ensure a professional result every time.

Tools & Supplies Needed

• Socket set and wrenches (metric)
• Oil drain pan
• Funnel
• Rags or paper towels
• 10W40 motorcycle-specific oil (500ml for gearbox, confirm owner's manual for minimum spec and alternatives)
• New crush washers (aluminum preferred)
• Gloves
• Torque wrench (for reinstalling drain plug to spec)

Oil Change Interval

• The factory recommendation is to change the oil every 6,000 kilometers (about 4,000 miles), but high-performance or race conditions may require shorter intervals for maximum longevity and protection. Many owners change after 20–30 hours of riding for best results.

Step-by-Step Instructions

• Warm up the engine: Run the bike for several minutes to bring the oil to operating temperature. This helps the oil flow out more easily, carrying contaminants with it.
• Prepare your work area: Place the bike on a stable stand or level ground. Make sure you have your tools, drain pan, and all supplies within arm’s reach.
• Remove the skid plate (if equipped): This improves access to the oil drain bolts.
• Locate the drain plugs: The 2025 Sherco 125 SE FACTORY features two drain bolts on the bottom of the engine. Both must be removed to fully drain the gearbox oil.
  • Each drain bolt uses an aluminum crush washer; inspect and replace as necessary to ensure a leak-free seal.{1}
• Drain the oil:
  • Place the drain pan directly beneath both drain bolts.
  • Using the correct size socket, loosen and remove the first drain bolt, then the second.
  • Allow the oil to drain completely. This may take several minutes. Rock the bike gently side to side to get residual oil.
  • Inspect both magnetic drain plugs for metal fragments and wipe them clean with a rag. Minor metal particles are normal, but larger chunks could indicate internal damage.{1}
• Replace drain bolts:
  • Install new crush washers if possible.
  • Screw both drain bolts back in by hand to prevent cross-threading; use a torque wrench to tighten to manufacturer’s specification (see the owner’s manual for the correct value).
• Refill with fresh oil:
  • Locate the oil fill port, typically just behind or slightly under the exhaust pipe. Access can be tight, so use a funnel to avoid spills.
  • Pour in 500ml of high-quality, 10W40 motorcycle oil. Always double-check the owner’s manual for oil capacity and type, as overfilling can harm engine performance.{2}{5}
• Check the oil level:
  • Many Sherco 125 SE models rely on a sight glass or dipstick on the engine case. Level the bike and check oil level after filling.
  • Add oil gradually as needed until it reaches the correct mark.
• Run the engine and inspect for leaks:
  • Start the engine, let it idle for a minute, and re-inspect drain plugs and fill area for leaks.
  • Reinstall the skid plate if removed.
• Dispose of used oil responsibly: Take old oil to a recycling center or auto parts store that accepts waste oil.

Model-Specific Call-Outs for 2025 Sherco 125 SE FACTORY

• Oiling System: The SE FACTORY is based on a two-stroke platform, and as such, the engine oil you are changing is primarily for the gearbox, not a four-stroke-type wet-sump system. Make sure to use transmission oil, not two-stroke premix.
• Drain Bolt Configuration: Unique to Sherco, there are two drain plugs which must be removed for a full drain. Both feature aluminum crush washers.
• Oil Fill Access: The fill port is somewhat obscured, often located behind the factory titanium exhaust. Use care to avoid burns and spills; a long-neck funnel is strongly recommended.{1}
• Crush Washers: Sherco recommends replacing these regularly to prevent leaks, but many riders successfully re-use them for several changes. If in doubt, replace to avoid frustration.
• Capacity: 500ml (0.5L) is the recommended capacity for the 125 SE gearbox; always confirm with your manual.

Key Takeaways

• Changing oil is straightforward with basic tools and attention to Sherco’s two-drain-plug system.
• Use a high-quality 10W40 oil to maximize protection.
• The oil you’re changing is for the transmission/gearbox only—two-stroke premix is handled separately and automatically on most models.
• Work carefully around the exhaust and always reinstall bolts to spec to prevent leaks.

For all your dirt bike parts, premium oil, and maintenance needs, trust MotoSport.com—your ride depends on it.

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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.