How to Change the Oil in a 2011 Yamaha TTR125L — MotoSport.com Guide
Shop parts for a 2011 Yamaha TTR125L Dirt Bike.
Changing the oil in your 2011 Yamaha TTR125L is a vital maintenance task that ensures your bike remains reliable and runs smoothly. While the TTR125L's design has remained consistent for years, there are a few details and tips specific to this model you'll want to know. This guide, proprietary to MotoSport.com, walks you through the required tools, step-by-step instructions, and helpful call-outs for your specific dirt bike.
Tools & Supplies You’ll Need
- Socket wrench with correct-size socket for the drain bolt (typically 12mm for the TTR125L)
- Drain pan for catching old oil
- Funnel for adding fresh oil
- Clean shop towels or rags
- Engine oil (Yamalube 10W-40 or other quality motorcycle oil — check owner’s manual for exact specification and amount)
- New oil filter (if model/year equipped; not all TTR125Ls have a replaceable filter)
- Torque wrench (optional but recommended for drain bolt accuracy)
- Latex/nitrile gloves (optional, for mess-free hands)
Step-by-Step: Changing the Oil
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Warm Up the Engine
- Start the bike and let it idle for about 3-5 minutes. Warm oil drains out more thoroughly and carries contaminants with it.
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Stabilize the Bike
- Turn off the engine. Put the bike on its side stand (the left side) or securely upright if you can – the left lean helps the oil drain better on TTR models.
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Locate the Drain Bolt
- On the left side of the bike, near the bottom engine case, you’ll find a single drain bolt — this is the oil drain plug. On the TTR125L, it’s easy to spot and access; no skid plate removal required.
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Drain Old Oil
- Place the drain pan under the drain bolt. Use your socket wrench to carefully unscrew the bolt.
- Let all of the oil flow out into the pan. Allow several minutes for a complete drain. Tipping the bike gently (just slightly.) toward the drain side may help remove residual oil.
- (Expert tip: While the oil is draining, you can kick the bike over a few times (with ignition OFF) to help move old oil out of internal galleries.)
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Replace the Drain Bolt
- Inspect the drain bolt and its washer for any damage. Replace the washer if it’s deformed or damaged to prevent leaks.
- Thread the drain bolt back in by hand to avoid cross-threading. Use a torque wrench to snug it to manufacturer spec (not overtight – “just snug,” as overtightening can strip the threads). Avoid using excessive force – this bolt simply seals the case.
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Replace the Oil (and Filter, If Equipped)
- Unlike some bigger bikes, the TTR125L often does not have an externally replaceable oil filter. If your bike has one, consult your owner’s manual for its specific location and replacement procedure.
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Add Fresh Engine Oil
- Unscrew the oil fill cap/dipstick located on the engine case (right-hand side).
- Using a clean funnel, pour in the recommended amount and type of oil (check the right engine case for the oil quantity mark – it’s conveniently cast into the case on most TTR125Ls; typically about 1.0-1.1 liters or as noted for your model year).
- Let the oil settle for a minute or two.
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Check Oil Level
- With the bike held upright and level, insert (but do not screw in) the dipstick into the oil fill hole. Remove and check that the oil level is between the min and max marks.
- If low, add oil in small increments, rechecking as you go.
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Start and Inspect
- Replace the dipstick/oil fill cap. Start the engine and let it idle for one to two minutes.
- Check the drain plug and fill area for leaks.
- Shut off the engine, let it sit for a minute, then re-check oil level and top off if necessary.
Important Callouts for the 2011 Yamaha TTR125L
- Single drain bolt design: The TTR125L uses just one drain bolt and typically does not have a replaceable oil filter, making oil changes simpler and faster compared to larger models. Be careful not to overtighten the drain bolt, as the small threads are easy to strip.
- Oil amount: The correct oil fill amount is usually cast into the case but always double-check your owner’s manual for exact specs for your bike – typically 1.0–1.1 liters for this year/model.
- Dipstick use: Always check the oil with the bike upright and the dipstick resting on the threads (not screwed in), which ensures an accurate oil level reading for Yamaha dirt bikes.
- Regular checks: After an oil change and before every ride, check oil level and for leaks. It’s a quick way to catch problems before they become serious.
- No external filter: Standard TTR125Ls do not require a filter change each time, but inspecting the oil for contaminants and monitoring oil color is important. If your version has an internal screen, clean it as recommended in the manual.
Keeping your 2011 TTR125L’s oil fresh is one of the best things you can do for long engine life and reliable performance, whether you’re trail riding or teaching new riders. Always dispose of used oil properly at a local recycling facility or auto parts store that accepts used motor oil.
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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.