Yamaha DT250 Duel Sports Bike 1971 to 1982

The Yamaha DT250 started life in 1968 as the DT-1 and it very quickly sold through the initial 12,000 unit production run. 

The US market was slowing down and yet there was a gap in the market for off-road motorcycles which only manufacturers such as Bultaco and Husqvarna were currently supplying specific off-road machines.

To get by off-road owners were modifying lightweight street bikes for off-road use, so there was a definite niche to be filled and Yamaha were armed and ready. 

The DT-1 preceded the later Yamaha DT250 and other variations in capacity that would come over the following years. It pretty much created the entire dual-sport category of motorcycles that would boom over the years to come and continue to thrive today.

In 1971 the Yamaha DT 250 was introduced to carry the torch and it was a pretty good follow up from the original Yamaha DT-1. 

The model had a run from ‘71 – ‘82 and saw various iterations like the DT250F and DT250MX. 

Let’s take a look.

Yamaha DT250
The Yamaha DT250

Table of Contents

Yamaha DT250 Review

Engine, Transmission, Power

The DT power plant was a basic 250cc air-cooled two-stroke, single cylinder engine that was ready for dirt roads, it was equally cheap and easy to operate and maintain. 

However, for 1972 it was given reed intake instead of piston-port. What this meant is that the reed valves stayed open for as long as there was airflow forcing its way in. It meant that engines could make more power without sacrificing anything from the powerband. 

The 246cc engine used an additional two transfer ports along with more holes in the piston skirt. These small details meant that there was an increase in power and a much better throttle response than what had been seen in pre-1972 Yamaha engines. 

When you talk about 17Nm of torque or even 20.7Nm of torque that would be seen in later years, it doesn’t seem like all that much these days. 

However, in the early ‘70s that amount of torque was enough for both on and off road escapades and the way it was delivered ensured a serious amount of fun was to be had. 

It wasn’t considered to be a joke road bike playing at being a genuine off-road Scrambler, the DT 250 was genuinely a great choice for hitting trails. The easy to maintain engine, 5 gears, torque and power band ensured this.

Chassis, Suspension, Handling, Brakes

In 1976 for the 1977 model, the Yamaha DT250 like the rest of the DT line was equipped with monoshock rear suspension which changed the game completely. It had trickled down from the success of the Moto-Cross machines competing in the previous years World Championships. 

The softer travel and longer spring rates meant the bike was now better utilised on the rough than it had been with the previous models’ twin-shocks. As a side-benefit of the mono-shock the bike was also lighter, with a dual-sport machine this is never a bad thing. 

The drum brakes on the front and rear fulfilled their role and provided appropriate stopping power in all the situations that you could find yourself in on the bike. 

High bars and foot pegs pulled back a little made for a comfortable ride that put the rider in a confident yet aggressive position in complete control, whether you are pulling away from traffic lights or hitting tree roots on a trail.

Great handling, precise steering, good cornering and high performance on rough roads were all positive aspects of the model that stemmed from the suspension setup mainly mated with the lightweight chassis.

A number of off-road features littered the Yamaha DT250:

  • Aluminum skid plate protecting the crankcase
  • Serrated Footpegs – in a high position for extra ground clearance
  • Turn signals tucked away supported by rubber mounts
  • Aftermarket accessories were found easily to upgrade the bike for off-road use even further and still can be bought today

The only real cosmetic changes during the model’s run was the shape of the fuel tank and the seat. Other than that stylistically the DT 250 remained a homage to standard ‘70’s motorcycle styling. 

Downsides

Where things went wrong with the Yamaha DT250 was no real fault of its own, but rather it was being put up against motorcycles from Honda and Kawasaki that were simply better performing. 

Had Yamaha thrown in enhancements, upped the spec, made modifications to the engine then the model may have shot to the top of its class. 

With all that said, today the DT250 is a solid dual purpose machine that will still put a smile on your face and is more affordable than other competitive Scramblers from the era.

If you are planning on riding a Yamaha DT250 today it is worth noting that the wiring and electronics were 6V up until 1982 and so you will need a 12V converter if you want to run more up to date lights etc.

It is said that the bike’s usage should be 70% off road and 30% on road, so the Yamaha DT250 performs much better on the dirt than the road and things like braking do reflect this. 

Yamaha DT250 Specifications

Engine and Transmission

  • Engine – Two-Stroke, Single-Cylinder, 246cc
  • Air-Cooled
  • Bore x Stroke – 70 x 64mm
  • Compression Ratio – 6.8:1
  • Induction – Single 28mm Mikuni
  • Ignition – External Rotor Magneto, CDI (1979)
  • Kick-Start
  • Max Power – 17 horsepower
  • Max Torque – 17.5Nm which increased to 20.7Nm in later years
  • Transmission – 5 Speed
  • Final Drive – Chain

Chassis and Dimensions

  • Frame – Double-downtube, full-cradle, mild-steel frame, tubular section, mild-steel swing arm
  • Front Suspension – Oil-damped, coil-spring fork
  • Rear Suspension – DeCarbon-type, Nitrogen-charged mono-shock (1977 onwards)
  • Front Brake – Conical Hub with drum brake
  • Rear Brake – Conical Hub with drum brake
  • Wheelbase – 1420mm
  • Length – 2,185mm
  • Height – 1,165mm
  • Width – 870mm
  • Seat Height – 856mm
  • Ground Clearance – 255mm
  • Wet Weight – 131kg
  • Fuel Capacity – 8.5 Litres

How fast is a Yamaha DT250?

The Yamaha DT250 had a top speed of only 68mph with a max torque of 17.5Nm at 6,500rpm. 

How much is a Yamaha DT250 worth?

DT250 UK prices

On average in the UK £4,500 will get you a good condition DT250, you will likely be looking at spending a bit more if you want something more original. 

This 1972 restored model is a great looking example that has had a lot of work done to get it into running condition and is well worth checking out.

Yamaha DT250 trail bike
A fine 1972 Yamaha DT250 currently available on Car and Classic

You could expect to pay as little as £1,500 for a model that is in need of work, such as this barn find imported from the US.

This 1972 model in classic green for £4,999 is absolutely stunning and one that is definitely worth looking at if you are in the market for a Yamaha DT250.

USA DT250 prices

In the US you will be looking somewhere between $2,500-$4,000 for a DT250 today.

This 1973 Yamaha DT250 in California is a great looking example of the little two-stroke trail bike. 

ZeCycles is also a pretty good website to check out for DT250 bikes. Currently there’s 1 priced at $1500 and 3 between $2200 and $2500

Verdict

Yamaha’s DT lines morphed into a legendary line of bikes and the 250 was a part of that. 

I am a big fan of small capacity machines and therefore the 250 is right up my street.

The Yamaha DT250 at all stages of its production was a Scrambler changing the boundaries of what was possible from a factory motorcycle. Taking riders on the street to the trail and then taking them back home again. 

Suddenly owners weren’t having to do all that much to modify their bikes for off-road use as there was a perfectly capable machine already being shipped from the factory. 

The Yamaha DT-1 may be the most popular and first rendition of the DT series and therefore its value is somewhat higher, but if you are looking at dipping your toe in the buy to ride classic bike pool, the later Yamaha DT250 is a solid choice and an evolution of that model.

70s motorcycles were a much simpler affair than todays offerings. Couple that with bang on ‘retro Scrambler’ styling, cheap parts and an easy to work on engine and the Yamaha DT250 makes an ideal first shed project.

Yamaha DT250 Duel Sports Bike 1971 to 1982

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