Yamaha DT125 (1986-87)

The Yamaha DT125R was a two-stroke, single cylinder, reed-valve motorcycle produced in 1986-87. Its engine had a capacity of 123cc, a compression ratio of 6.8:1, and was lubricated with autolube oil with a capacity of 1.2 litres. The bike was equipped with a VM24 carburetor and CDI ignition. Its maximum power output was 14 hp at 6500 rpm and maximum torque was 1.5 kgf-m at 6500 rpm. Its clutch was a wet multiplate and it had a 6-speed transmission with a chain final drive. The front suspension was telescopic forks and the rear suspension was a Monocross system. Front and rear brakes were single 230mm and 220mm discs, respectively. The bike had a wheelbase of 1360mm, a seat height of 840mm, and a ground clearance of 270mm. It had a wet weight of 119.0 kg and a fuel capacity of 10 litres, with an average consumption of 20 km/lit. Its braking distance from 60-0 and 100-0 was 16.0m and 43.7m, respectively. The bike had a standing 1/4 mile time of 16.9 seconds at a speed of 115.9 km/h and a top speed of 124.6 km/h. It was reviewed by Moto Sprint in their 1989 Group Test.

Technical specifications:

Make Model: Yamaha DT 125R

Year: 1986-87
Engine: Two stroke, single cylinder, reed-valve
Capacity: 123 cc / 7.5 cu-in
Bore x Stroke: 56 X 50 mm
Compression Ratio: 6.8:1
Lubrication: Autolube
Oil Capacity: 1.2 Litres
Induction: VM24 carburetor
Ignition: CDI
Starting: Kick
Max Power: 14 hp / 10.3 kW @ 6500 rpm
Max Torque: 1.5 kgf-m / 15.2 Nm @ 6500 rpm
Clutch: Wet multiplate
Transmission: 6 speed
Final Drive: Chain
Front Suspension: Telescopic Forks
Rear Suspension: Monocross
Front Brakes: Single 230mm disc
Rear Brakes: Single 220mm disc
Front Tyre: 2.75-21
Rear Tyre: 4.10-18
Dimensions: Length 2135 mm / 81.0 in Width 820 mm / 32.2 in Height 1255 mm / 49.4 in
Wheelbase: 1360 mm / 53.5 in
Seat Height: 840 mm / 33.0 in
Ground Clearance: 270 mm / 10.6 in
Wet Weight: 119.0 kg / 262.4 lbs
Fuel Capacity: 10 Litres / 2.2 gal
Consumption Average: 20 km/lit
Braking 60 – 0 / 100 – 0: 16.0 m / 43.7 m
Standing 1/4 Mile: 16.9 sec / 115.9 km/h
Top Speed: 124.6 km/h / 77.5 mph
Road Tests: Moto Sprint 1989 Group Test