Four stroke, twin cylinder, OHC,
2 valve per cylinder
Capacity
249 cc / 12.2 cuin
Bore x Stroke
56 x 50.6 mm
Cooling System
Air cooled
Compression Ratio
9.5:1
Induction
Keihin carburettor
Lubrication
Forged and wet sump
Ignition
2 sets points, bobine
Starting
Kick
Max Power
30 hp / 21.9 kW @ 10500 rpm
Max Torque
21 Nm / 15.5 lb-ft @ 9500 rpm
Clutch
Wet, multi plate type
Transmission
5 Speed
Final Drive
Chain
Frame
Semy double cradle steel frame.
Front Suspension
Telescopic forks
Rear Suspension
Swinging arm pre-load adjustable schocks
Front Brakes
Drum
Rear Brakes
Drum
Front Tyre
3.00-18
Rear Tyre
3.25-18
Rake
63.0°
Trail
85 mm / 3.3 in
Wheelbase
1320 mm / 52.0 in
Wet Weight
160 kg / 352 lbs
Fuel Capacity
12 Litres / 3.1 US gal
A drastic restyling of Honda's
250 in the late 1960s indicated new thinking at Hamamatsu coincident with
the introduction of the CB450 and, later, the 750-4. The tall, narrow look
of the CB72, with its humped petrol tank, spine frame and orward-inclined
engine, was abandoned.
The new CB250, first shown in
Europe at the Earls Court show of 1967, was much more in the western
tradition, in looks, although still possessing above-average performance.
Running through several model
numbers over the years, it long retained the essential specification of an
upright parallel-twin engine of 56 x 50.6mm bore and stroke housed in a
full-loop, tubed frame and driving the rear wheel by exposed chain via a
five-speed integral gearbox.
The petrol tank was broader,
more rounded, than on the CB72, and because the machine was longer and lower
than before, the riding position lost its cramped but speed-suited layout
Heavier than the original 250, but with no additional power to match, the
CB250 was not quite the speedy performer that the CB72 had been.
For this reason it had something
of a lukewarm reception from sport devotees in the UK, though its sales
among people who wanted a reliable, economical workhorse for daily commuting
far exceeded those of the previous
model, which had been unashamedly slanted at the 'enthusiast' market.
Successor to the CB72/73 series,
the CB250 was by comparison of orthodox design, aimed to appeal to a bigger
market
Specification
CB250K3: Twin-cylinder, ohc, 248cc (56 x 50.6mm). 30bhpl 10,500rpm.
Five-speed gearbox. Coiligni'alternator. 2.5g petrol, 33Apt oil. Telescopic
I pf. Tyres, 3.00 x Win (fr), 3.50 x Win (r). 3501b. 95mph.