Yamaha DT125: review, history, specs

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Yamaha DT125
Production 1974 - 1981
Class Enduro
Successor Yamaha DT125LC
Yamaha DT125R
Top Speed 65 mph
Spark Plug NGK B8ES 74-76, '78 - 81
Battery YUASA 12N7-3B `74-75[1]
Final Drive Chain: 428 `74-75[1]
Front Tire 3.00-19 '74-75
2.75-21 '76-81
Rear Tire 3.25-18 '74-76
3.50-18 '78-81
Oil Filter K&N KN-143
Recommended Oil Yamalube 10w-40
Related Yamaha DT100
Yamaha DT175
Yamaha DT250
Competition Honda SL175
Kawasaki F6 (125) and Kawasaki KS125
Harley-Davidson SX125
Manuals Service Manual

The Yamaha DT125 was a 125cc, 2-stroke, dual-purpose motorcycle manufactured by Yamaha from 1974 through 1988 in the US. Some derivatives are still sold in other markets to this day. The model designation DT indicates that it is a 2-stoke off-road styled motorcycle, it had a raised exhaust, handlebars with cross members, universal tires, and adequate ground clearance for an off-road enduro motorcycle or trail motorcycle. The USA received the last DT125H in 1981.

The DT125 had a raised rear and front fender, raised exhaust, handlebars with cross members, universal tires, and adequate ground clearance for an off-road-enduro motorcycle or trail motorcycle.

When first launched the DT125 had a single cylinder, air-cooled, 2-stroke engine, a cradle style tubular steel frame, conventional telescopic front forks and dual shock swingarm rear suspension, and drum brakes front and rear. Over the years the model received numerous updates and restyles, the dates and specifications of which vary between different markets. Notable changes include the appearance of a single shock absorber rear swingarm in 1977, which Yamaha referred to as Mono-cross, or MX for short, a feature that appeared on many of Yamaha's other small and medium sized motorcycles at a similar time. In 1983 the DT125 received a major restyle and gained a liquid cooled engine to become the DT125LC. In 1985 the electrics were upgraded to 12v, the front brake drum was changed to a disc, and rising rate rear suspension was fitted with the introduction of the DT125LC mk3. Another restyle for 1987 gave us the DT125R, the most noticeable specification change from it's predecessor being the swap to a rear disc brake.

1974 DT125A[edit | edit source]

  • Starting Engine#: 444-000101

The Yamaha DT 125 model is a Enduro / offroad bike manufactured by Yamaha. The engine produces a maximum peak output power of 17.3 HP (12.9 Kw) @ 7000 RPM and a maximum torque of 14.00 Nm (10.00 ft.lbs) @ 7000 RPM.

1975 DT125B[edit | edit source]

  • Starting Engine#: 444-100101

1976 DT125C[edit | edit source]

  • Starting Engine#: 560-000101

1977 DT125[edit | edit source]

The 1977 Yamaha DT 125 is an entry-level, road-legal, off-road machine that can just as well be used for a daily commute to and from work. It comes standard with features such as laced wheels, a dual seat, a telescopic front fork, dual shocks as a rear suspension, a high-mounted exhaust, knobby tires mounted on them, a blacked-out frame, and a round headlamp.

In the tech/engine department it sports an air-cooled, two-stroke, 123cc, single cylinder powerhouse mated to a four-speed manual transmission, and can produce 14 horsepower and 14 Nm of torque.

1978 DT125E[edit | edit source]

  • Start Engine#: 2A6-000101

1979 DT125F[edit | edit source]

  • Starting Engine#: 2N4-000101

In Media[edit | edit source]

References[edit | edit source]

  1. 1.0 1.1 2019 Western Power Sports Catalog. Western Power Sports. 2019.