Yamaha DT3

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'Yamaha DT-3 250'
Production 1975
Class [[:Category:Enduro motorcycles|Enduro]] [[Category:Enduro motorcycles]]
Predecessor Yamaha DT2
Two stroke, single cylinder, air cooled
Bore / Stroke 71.1mm x 71.1mm
Compression ratio 6.8:1
Horsepower 24.0 HP (17.9 KW) @ 7000RPM
Torque 17.7 ft/lbs (24.0 Nm) @ 6000RPM
Spark Plug NGK B8ES
Transmission Gear box: 6-Speed

Final Drive: Chain

Clutch: Wet, multiplate
Suspension Front: Telescopic forks
Rear: Dual shocks
Brakes Front: Drum
Rear: Drum
Front Tire 3.25-19
Rear Tire 4.00-18
Wheelbase 54.69 inches (1389 mm)
Length 82.72 inches (2101 mm)
Width 35.0 inches (889 mm)
Seat Height 32.01 inches (813 mm)
Weight 122.0 kg (wet)
Manuals Service Manual

The Yamaha DT-3 250 was a Two stroke, single cylinder, air cooled Enduro motorcycle produced by Yamaha in 1975. Max torque was 17.7 ft/lbs (24.0 Nm) @ 6000 RPM. Claimed horsepower was 24.0 HP (17.9 KW) @ 7000 RPM.


A 71.1mm bore x 71.1mm stroke result in a displacement of just 246.0 cubic centimeters.


The bike has a 6-Speed transmission. Power was moderated via the Wet, multiplate.


It came with a 3.25-19 front tire and a 4.00-18 rear tire. Stopping was achieved via Drum in the front and a Drum in the rear. The front suspension was a Telescopic forks while the rear was equipped with a Dual shocks. The wheelbase was 54.69 inches (1389 mm) long.


  • Starting Engine#: DT1F-135101

1975 Yamaha DT-3 250

The DT's engine was your basic 250cc air-cooled two-stroke single that was dirt reliable plus dirt cheap to operate and maintain. Fed by a 26mm Mikuni carburetor and with 6.8:1 compression, the 246cc (15 seven ports on its "Torque Induction" two-stroke engines). Along with the standard intake, exhaust and transfer ports, Yamaha used an additional two transfer ports along with holes in the piston skirt. These ho would normally be covered by the skirt. This small detail resulted in a slight increase in power, and better throttle response than Yamaha's pre 1972 engines.