Yamaha YZ 125 (2014) — Specs
Identity
Manufacturer: Yamaha
Model: YZ 125
Category: Off-Road Bike
Type: Off-Road Bike
Years: 2014 → 2014
Engine
Displacement (cc): 125
Cylinders: 1
Torque (Nm): 32
Dimensions
Overall length: 2175 mm
Overall width: 825 mm
Overall height: 1290 mm
Wheelbase: 1485 mm
Ground clearance: 335 mm
Weight (kg): 94
Tires
Front tire: 80/100-21
Rear tire: 100/90-19
Front pressure (bar): 1
Rear pressure (bar): 1
Drivetrain
Drive chain: 420 chain, 112 links
Sprockets (front / rear): 13 / 48
Ignition
Spark plug: NGK BR9EVX
Plug gap: 0.6-0.7 mm
Fluids & Filters
Air filter: Hiflofiltro HFA4115
Coolant (L): 0.9
Brake fluid: DOT 4
Service
Battery: OEM battery specification
Service interval (km): 3000
Service interval (months): 12
Parts and consumables for this motorcycle
Data is gathered with care, but without guarantee. Always confirm critical information with your dealer or workshop.
Service notes
Service interval: every 3,000 km or 12 months, whichever comes first. Spark plug: NGK BR9EVX (gap 0.6-0.7 mm). Brake fluid: DOT 4. Coolant capacity: 0.9 L. Chain: 112 links, sprockets 13/48 teeth. Tire pressure: front 1 bar, rear 1 bar (cold). Tire size: front 80/100-21, rear 100/90-19. Always confirm critical values with the workshop manual or an authorised dealer.
OEM and quality aftermarket parts that fit this bike. Always confirm with your dealer before ordering.
Engine oil
Spec: 2-stroke premix (JASO FC/FD), typical ratio 32:1–50:1
- OEM OEM 2-stroke oil (JASO FC/FD)
- Premium Motul 800 2T Off Road (100% Synthetic, race)
- Premium Motul 510 2T Technosynthese (Semi-Synthetic)
- Standard Repsol Moto Sintetico 2T (Synthetic)
- Standard Elf Moto 2 Tech (Semi-Synthetic)
Fully Synthetic vs Semi-Synthetic
| Fully Synthetic | Semi-Synthetic | |
|---|---|---|
| Base oil | 100% chemical synthesis (ester or PAO) | Mineral oil + synthetic additives |
| Heat resistance | Excellent — stable at extreme heat & RPM | Good — suitable for normal temperatures |
| Cold start | Better — reaches engine faster when cold | Good — adequate for normal climates |
| Change interval | Longer (up to 10,000 km) | Shorter (5,000–7,000 km typical) |
| Price | Higher | Lower |
Oil filter
Spec: Not applicable — 2-stroke engine has no replaceable oil filter cartridge
- OEM 2-stroke engine — no engine-oil filter to replace.
- OEM Use the recommended 2-stroke oil grade listed above — clean oil is your only filtration.
Air filter
Spec: Hiflofiltro HFA4115
- Standard Hiflofiltro HFA4115
Spark plug
Spec: NGK BR9EVX, gap 0.6-0.7 mm
- OEM NGK BR9EVX
- Premium NGK BR9EIX
- Standard NGK BR9EVX
Front brake pads
Rear brake pads
Drive chain
Spec: 112 links | Sprockets 13/48 teeth / 112 links
Front tire
Spec: 80/100-21, 1.0 bar
- OEM OEM 80/100-21
Rear tire
Spec: 100/90-19, 1.0 bar
- OEM OEM 100/90-19
Battery
Brake fluid
Spec: DOT 4
- Standard TotalEnergies HBF4
Coolant
Spec: 0.90 L coolant capacity
Service interval
Spec: 3 000 km / 12 months
- OEM Engine oil + oil filter change
- OEM Air filter inspection
- OEM Spark plug check
- OEM Brake fluid replacement: every 2 years
Valve check
Spec: Not applicable — 2-stroke engine has no valves
- OEM 2-stroke engine — no valve clearance to inspect.
- OEM Inspect piston, rings and cylinder at engine rebuild intervals (~30–50 hours for race, longer for street).
- OEM Check exhaust power-valve operation (if equipped) every 20–30 service hours.
