Yamaha YZ125: review, history, specs
Yamaha YZ125 | |
Manufacturer | |
---|---|
Also called | YZ125X, YZ 125 |
Production | 1997 - 2019 |
Class | Motocross |
Engine | single cylinder, two-stroke |
Bore / Stroke | 54.0mm x 54.5mm |
Compression ratio | 10.7:1 |
Top Speed | 72 mph |
Torque | 17.7 ft/lbs (24.0 Nm) @ 10000RPM |
Ignition | cdi |
Spark Plug | NGK B10EG '76-80 , '81 NGK B9EG '74-75 NGK B9EG '82 , '84-85 , '88-98 NGK BR9EG '83 , '86-87 , '99-08 |
Transmission | Gear box: 6-speed Final Drive: chain |
Suspension | Front: kyb® speed-sensitive system inverted fork; fully adjustable Rear: kyb® single shock; fully adjustable |
Brakes | Front: single disc. hydraulic. Rear: single disc. hydraulic. |
Front Tire | 3.00-21 '76 , '77-80 , '81 , '82 2.75-21 '74-75 80/100-21 '86-87 , '88 , '89-93 , '94-96 , '97-98 , '99-04 , '05-08 90/90-21 '83 , '84 , '85 |
Rear Tire | 6675 '76 , '77-80 , '81 , '82 130/80-18 '83 , '84 , '85 100/90-19 '89-93 , '94-96 , '97-98 , '99-04 , '05-08 3.50-18 '74-75 100/100-18 '86-87 , '88 |
Wheelbase | 56.81 inches (1443 mm) |
Length | 84.09 inches (2136 mm) |
Width | 32.6 inches (828 mm) |
Height | 50.98 inches (1295 mm) |
Seat Height | 38.39 inches (975 mm) |
Weight | 190.04 pounds (86.2 Kg) (dry), 93.9 kg (wet) |
Recommended Oil | Yamalube 10w-40 |
Fuel Capacity | 2.11 Gallon (8.00 Liters) |
Related | Yamaha YZ50 Yamaha YZ60 Yamaha YZ80 Yamaha YZ85 Yamaha YZ100 Yamaha YZ125 Yamaha YZ250 Yamaha YZ400 Yamaha YZ465 Yamaha YZ490 |
Competition | Honda CR125R Kawasaki KX125 Suzuki RM125 |
Manuals | Service Manual |
The Yamaha YZ125 was a single cylinder, two-stroke Trial motorcycle produced by Yamaha between 1997 and 2019. Max torque was 17.7 ft/lbs (24.0 Nm) @ 10000 RPM.
Engine[edit | edit source]
The engine was a liquid cooled single cylinder, two-stroke. A 54.0mm bore x 54.5mm stroke result in a displacement of just 125.0 cubic centimeters.
Drive[edit | edit source]
The bike has a 6-speed transmission. Power was moderated via the multiplate wet clutch.
Chassis[edit | edit source]
It came with a 80/100-21 front tire and a 100/90-19 rear tire. Stopping was achieved via single disc. hydraulic. in the front and a single disc. hydraulic. in the rear. The front suspension was a kyb® speed-sensitive system inverted fork; fully adjustable while the rear was equipped with a kyb® single shock; fully adjustable. The YZ125 was fitted with a 2.11 Gallon (8.00 Liters) fuel tank. The bike weighed just 190.04 pounds (86.2 Kg). The wheelbase was 56.81 inches (1443 mm) long.
First Generation[edit | edit source]
1974 YZ125A[edit | edit source]
- SERIAL # 453-000101 - 007730
1976 YZ125C[edit | edit source]
1975[edit | edit source]
- SERIAL # 453-100101 - 101620
1976[edit | edit source]
- SERIAL # 537-000101 - 014044
1977[edit | edit source]
- SERIAL # 1W1-000101 - 015610
1978[edit | edit source]
- SERIAL # 2K6-000101 - 015080