Yamaha DT 125 R (1991–2000) — Specs
Identity
Manufacturer: Yamaha
Model: DT 125 R
Category: Motorcycle
Type: Motorcycle
Years: 1991 → 2000
Engine
Displacement (cc): 125
Cylinders: 1
Power (hp): 12
Power (kW): 9
Torque (Nm): 21
Dimensions
Overall length: 1950 mm
Overall width: 720 mm
Overall height: 1110 mm
Wheelbase: 1340 mm
Ground clearance: 150 mm
Weight (kg): 119
Seat height (mm): 900
Tank (L): 10
Tires
Front tire: 90/90-21
Rear tire: 110/90-18
Front pressure (bar): 1.6
Rear pressure (bar): 1.8
Drivetrain
Drive chain: 420 chain, 133 links
Sprockets (front / rear): 16 / 56
Ignition
Spark plug: NGK BR9ES
Plug gap: 0.8 mm
Fluids & Filters
Engine oil (without filter, L): 1.2
Air filter: OEM air filter
Coolant (L): 0.9
Brake fluid: DOT 4
Fuel consumption
Estimated fuel consumption: ~3.0 L/100 km
Estimated range: ~333 km on a full tank (10.0 L)
Note: estimate based on engine size + bike type. Real-world ±20%.
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. Engine oil: 1.2 L without filter change. Spark plug: NGK BR9ES (gap 0.8 mm). Brake fluid: DOT 4. Coolant capacity: 0.9 L. Chain: 133 links, sprockets 16/56 teeth. Tire pressure: front 1.6 bar, rear 1.8 bar (cold). Tire size: front 90/90-21, rear 110/90-18. 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 autolube (JASO FC), separate mix-oil reservoir
- OEM OEM 2-stroke oil (JASO FC/FD)
- Premium Motul 710 2T (100% Synthetic)
- 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
Spark plug
Spec: NGK BR9ES, gap 0.8 mm
- OEM NGK BR9ES
- Premium NGK BR9EIX
- Standard NGK BR9ES
Front brake pads
Rear brake pads
Drive chain
Spec: 133 links | Sprockets 16/56 teeth / 133 links
Front tire
Spec: 90/90-21, 1.6 bar
- OEM OEM 90/90-21
Rear tire
Spec: 110/90-18, 1.8 bar
- OEM OEM 110/90-18
Battery
- Premium Yuasa YTX7L-BS or YTX7A-BS (typical 125-250cc)
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.
Suspension
Spec: 41 mm telescopic fork / 486 ml SAE 10W
- OEM Fork: 41 mm telescopic fork
- OEM Fork oil grade: 486 ml SAE 10W
