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1973 Yamaha DT3-250

Specifications and workshop reference information for the 1973 Yamaha DT3-250, including engine, chassis, service data and setup details.

Note: Specs are compiled from factory data, manuals and owner feedback. Bikes vary — if yours is different, jump into the forum and share it.

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1973 Yamaha DT3-250

General Specifications

ModelYamaha 250 DT3
Weight (net)258 lbs (117 kg)

Performance

Max speed75 mph (120 km/h) or more
Fuel consumption94.1 mpg @ 31 mph (40 km/L @ 50 km/h)
Climbing ability35°
Turning radius78.7 in (2000 mm)
Braking distance49 ft @ 31 mph (15 m @ 50 km/h)

Engine

ModelDT1-F
Type2-stroke, gasoline, torque induction
LubricationSeparate lubrication (Yamaha Autolube)
CylinderSingle, forward inclined, 7 port
Displacement246 cc
Bore x Stroke70 x 64 mm
Compression ratio6.8:1
Max power24 BHP @ 7000 rpm
Max torque18.3 ft-lbs @ 6000 rpm
Starting systemPrimary-coupled kick starter
IgnitionFlywheel magneto

Carburetor

TypeVM26SH x 1
Main jet#160
Jet needle5DP7-3

Transmission

ClutchWet, multiple-disk
Primary reduction63/21 (3.095)
GearboxConstant mesh, 5-speed
1st2.533
2nd1.789
3rd1.304
4th1.000
5th0.766
Final driveChain 44/14 (3.142)

Dimensions

Length2115 mm
Width890 mm
Height1170 mm
Wheelbase1390 mm
Ground clearance260 mm

Chassis

FrameTubular double loop
Front suspensionTelescopic fork
Rear suspensionSwinging arm
Front cushionCoil spring, oil damper
Rear cushionCoil spring, oil damper

Brakes & Wheels

Front brakeInternal expansion (right hand)
Rear brakeInternal expansion (right foot)
Front tire3.00-21-4PR
Rear tire4.00-18-4PR

Electrical

DynamoF2A-1B (Mitsubishi)
Battery6N4-2A-2
Capacity6V 4Ah
Headlight6V 35W/35W
Indicators6V 17W
Tail light6V 17W / 5.3W
Meter light6V 3W x2

Tanks

Fuel capacity2.5 US gal (9.5 L)
Oil capacity1.7 US qt (1.6 L)

250cc Other Specs

1968 Yamaha DT1 250
1971 Rickman Montesa 250
1971 Yamaha DT1E 250

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