How to Change the Oil in a 2009 Yamaha TTR125 – A Step-by-Step MotoSport.com Guide
Shop parts for a 2009 Yamaha TTR125 Dirt Bike.
Keeping your 2009 Yamaha TTR125 in top shape means staying on top of routine maintenance like oil changes. Below you’ll find everything you need to know: all tools required, detailed steps, and model-specific tips for your TTR125.
Tools and Supplies Needed
- Engine oil (10W-40) – Yamaha recommends 10W-40, full synthetic or standard depending on riding conditions
- Oil drain pan
- 17mm socket and ratchet
- Torque wrench (optional, but ideal to avoid over-tightening the drain bolt)
- Funnel
- Shop towels/rags
- Gloves (for a clean job and safety)
- Replacement drain bolt washer/O-ring if needed
Before You Begin
- Make sure the engine is warm. Run the bike for a few minutes – this thins the oil for better drainage .
- Turn the bike off and place it securely on its kickstand (left side). The TTR125 leans left naturally, assisting in complete draining .
- The drain bolt is on the left lower side of the engine, marked by its proximity to the bike’s frame .
Step-by-Step Oil Change Instructions
- Remove the oil fill cap/dipstick: Unscrew it from the right side of the engine and set it aside. This allows air to flow, speeding up drainage.
- Position your drain pan: Slide it under the drain bolt/location directly below the engine.
- Remove the drain bolt: Use a 17mm socket and ratchet to loosen it. Take care; the bolt shouldn’t be overtightened when reinstalling. Allow oil to drain fully – it can take several minutes for a complete drain .
- Check the drain bolt washer/O-ring: Inspect the washer or O-ring for signs of damage. Replace if worn or flattened. This ensures a tight seal and prevents leaking.
- Reinstall and tighten the drain bolt: Reinstall the bolt (with washer) by hand at first, then snug it up with your 17mm socket. Don’t overtighten; just firm and secure. If using a torque wrench, reference the owner’s manual for torque specs.
- Pour in new oil: Using your funnel, pour in 1.0 quart (1,000 ml) of fresh engine oil . The TTR125’s published capacity is 1.06 quarts, but after a routine change, 1.0 quart is sufficient due to residual oil .
- Reinstall the oil fill cap/dipstick: Thread it back in and hand-tighten.
- Start the engine: Let it idle for 30 seconds to circulate the new oil.
- Check oil level: Turn the engine off and let the oil settle for a couple minutes. Stand the bike upright (not on the kickstand), unscrew the dipstick, wipe it, fully reinsert, then remove and check the oil mark . Oil should be between the two indicator marks on the dipstick.
- Top off if needed: If low, add small amounts and recheck. Do not overfill.
- Wipe down and check for leaks: Inspect the drain bolt and filter area for any drip. If leaking, shut down, drain, inspect/replace the washer/O-ring and reinstall.
- Dispose of old oil responsibly: Bring used oil to a local auto parts store or recycling location.
Model-Specific Callouts for the 2009 Yamaha TTR125
- All TTR125 variants (2000+): Engines and oil drain system have remained largely unchanged. The process above covers all LE, E, and base models .
- Single drain bolt: Only one drain bolt needs to be removed for the oil change, making the process especially simple .
- Oil filter: The TTR125 does not have a conventional replaceable oil filter; there is a small oil screen inside, but you don’t need to service it for routine oil changes.
- Thread care: Yamaha cases are aluminum; never overtighten the drain bolt, as stripping is a risk .
Pro Tips from MotoSport.com
- Always change oil after muddy or wet rides for best engine protection.
- Warm oil drains much faster and cleaner than cold.
- OEM Yamaha oil and washers are recommended for best performance and sealing.
- If your engine has been rebuilt or has had prior modifications, check for exact oil capacity with your builder.
- Maintain records of oil change intervals for resale value and peace of mind.
Changing the oil in your 2009 Yamaha TTR125 is quick, easy, and helps keep your bike running strong for years of riding fun. For more expert tips, parts, and UTV/dirt bike guides, trust MotoSport.com – your source for everything off-road.
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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.