1968 Honda CB250


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1968-1973 Honda CB250 Full Specifications

Get to know the 1968-1973 Honda CB250 in exquisite detail with our meticulously crafted motorcycle specifications tables.

Click or tap on a navigation pane below to find your way through our highly detailed, categorised 1968-1973 Honda CB250 specifications.


1968-1973 Honda CB250 Performance Specifications Table

Climbing ability20 o
Fuel consumption127 mpg (average)
Braking distance14.5 m @ 31 mph
Minimum turing radius4,200 mm

1968-1973 Honda CB250 Dimensions Specifications Table

Overall length2,090 mm
Overall width775 mm
Overall height1,075 mm
Wheelbase1,320 mm
Ground clearance150 mm
Wet weight160 kg (fuel and fluids)

1968-1973 Honda CB250 Frame Specifications Table

Frame typeSemi-double, cradle
Rake / Caster angle63 °
Trail length85 mm

1968-1973 Honda CB250 Engine Specifications Table

Power30 bhp @ 9,500 rpm
Torque20.9 Nm @ 9,500 rpm
Engine capacity / displacement249 cc
Engine configurationTwin cylinder, OHC
ArrangementVertical, twin parallel
Bore and Stroke56.0 mm x 50.6 mm
Compression ratio9.5 : 1
Electric startno
Engine weight52.5 Kg (dry)

1968-1973 Honda CB250 Valves and Springs Specifications Table

Intake valve clearance0.01 mm - 0.035 mm
Intake valve lift6.876 mm
Intake valve concentricty of valve facewithin 0.03 mm
Intake valve stem diameter6.975 mm - 6.99 mm
6.955 mm (service limit)
Intake valve guide diamater7.00 mm - 7.01 mm (bore)
Intake valve guide diameter7.05 mm (bore service limit)
12.56 mm - 12.57 mm (outer)
Intake valve length98.05 mm - 98.35 mm
97.65 mm (service limit)
Intake valve head thickness0.85 mm - 1.15 mm
0.6 mm (service limit)
Exhaust valve clearance0.03mm - 0.046 mm
Exhaust valve lift6.869 mm
Exhaust valve concentricty of valve facewithin 0.03 mm
Exhaust valve stem diameter6.955 mm - 6.97 mm
6.935 mm (service limit)
Exhaust valve guide diameter7.00 mm - 7.01 mm (bore)
7.05 mm (bore service limit)
12.56 mm - 12.57 mm (outer)
Exhaust valve length96.63 mm - 96.93 mm
96.23 mm (service limit)
Exhaust valve head thickness0.85 mm - 1.15 mm
0.6 mm (service limit)
Intake valve spring free length49.0 mm (outer spring)
47.8 mm (outer spring service limit)
39.8 mm (inner spring)
39.3 mm (inner spring service limit)
Intake valve fitted load62.6 kg - 72.0 kg (valve closed)
Exhaust valve spring free length49.0 mm (outer spring)
47.8 mm (outer spring service limit)
39.8 mm (inner spring)
39.3 mm (inner spring service limit)
Exhaust valve fitted load30.5 kg - 35.1 kg (valve closed)

1968-1973 Honda CB250 Valve Train Specifications Table

Layoutoverhead camshaft
Drive typechain driven
Rocker diameter13.0 mm - 13.027 mm (bore)

1968-1973 Honda CB250 Cylinder and Piston Specifications Table

Cylinder bore diameter56.01 mm - 56.02 mm (bore)
56.11 mm (bore service limit)
Cylinder out of round0.05 mm (service limit)
Cylinder taper0.05 mm (service limit)
Piston diameter55.97 mm - 55.99 mm (outer)
Top piston ring to groove clearance0.03 mm - 0.06 mm
0.18 mm (service limit)
Second piston ring to groove clearance0.015 mm - 0.045 mm
0.165 mm (service limit)
Piston pin diameter14.994 mm - 15.00 mm
Piston pin bore diameter15.002 mm - 15.008 mm
15.05 mm (service limit)
Piston ring oil groove width0.01 mm - 0.045
Top piston ring end gaps0.15 mm - 0.35 mm
0.075 mm (service limit)
Second piston ring end gaps0.15 mm - 0.35 mm
0.075 mm (service limit)

1968-1973 Honda CB250 Clutch and Primary Drive Specifications Table

Reduction ratio3.714 : 1
Clutch typeMulti-plate, wet
Clutch spring free length35.5 mm
34.2 mm (service limit)
Plate warpage0.3 mm (service limit
Friction plate thickness2.62 mm - 2.78 mm
2.3 mm (service limit)

1968-1973 Honda CB250 Transmission Specifications Table

Type5 speed, constant mesh
Gear ratio1st gear = 2.353 : 1
2nd gear = 1.636 : 1
3rd gear = 1.269 : 1
4th gear = 1.036 : 1
5th gear = 0.900 : 1

1968-1973 Honda CB250 Final Drive Specifications Table

Final driveChain
Final drive ratio2.375

1968-1973 Honda CB250 Lubrication Specifications Table

System typeForced pressure and wet sump
Oil capacity2.0 litres (dry fill)

1968-1973 Honda CB250 Cooling System Specifications Specifications Table

System typeAir cooled

1968-1973 Honda CB250 Fuel System Specifications Table

Fuel typeunleaded 95 RON
Fuel tank capacity12.0 litres

1968-1973 Honda CB250 Carburetion Specifications Table

Carburetor typeConstant velocity
Carburetor manufacturerKeihin

1968-1973 Honda CB250 Ignition System Specifications Table

Spark plug typeNGK B-8ES

1968-1973 Honda CB250 Front Suspension and Steering Specifications Table

TypeTelescopic fork

1968-1973 Honda CB250 Rear Suspension Specifications Table


1968-1973 Honda CB250 Front Brake Specifications Table

Front brake typeInternal expansion

1968-1973 Honda CB250 Rear Brake Specifications Table

Rear brake typeInternal expansion

1968-1973 Honda CB250 Wheels and Tyres Specifications Table

Front wheel size18 inch
Front tyre size3.00-18 (4PR)
Rear wheel size18 inch
Rear tyre size3.25-18 (4PR)

1968-1973 Honda CB250 Electrical Charging Specifications Table

Battery voltage rating12 volts DC
Battery capacity12 ampere hour (Ah)



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