Honda C90 K3 - Specifications & Review

C90 K3

Article Complete Info

Articleid43877
CategoryScooter
MakeHonda
ModelC90 K3
Year1978

Chassis, Suspension, Brakes & Wheels

Frametypepressed steel monoque with engine part of loadbearing
FrontbrakesExpanding brake (drum brake). twin expanding shoe
Frontbrakesdiameter110 mm (4.3 inches)
Frontsuspensionhydraulically dampened leading link forks
Frontwheeltravel75 mm (3.0 inches)
Rake27.0°
RearbrakesExpanding brake (drum brake). twin expanding shoe
Rearbrakesdiameter110 mm (4.3 inches)
Rearsuspensionhydraulically dampened with compression spring
Rearwheeltravel100 mm (3.9 inches)
Trail75 mm (3.0 inches)

Engine & Transmission

Borexstroke50.0 x 45.6 mm (2.0 x 1.8 inches)
Clutchmulti plate wet automatic
Compression8.2:1
CoolingsystemAir
Displacement89.00 ccm (5.43 cubic inches)
EnginedetailsSingle cylinder, four-stroke
Exhaustsystemsinle stainless steel pipe
Fuelconsumption2.50 litres/100 km (40.0 km/l or 94.09 mpg)
FuelsystemCarburettor. keihin seiki
Gearbox3-speed
Greenhousegases58.0 CO2 g/km. (CO2 - Carbon dioxide emission)
Ignitioncontact breaker points
LubricationsystemWet sump
Maxrpm10000
Power7.50 HP (5.5 kW)) @ 9500 RPM
Topspeed80.0 km/h (49.7 mph)
Torque0.67 Nm (0.1 kgf-m or 0.5 ft.lbs) @ 6000 RPM
TransmissiontypefinaldriveChain
Valvespercylinder2

Other Specifications

ColoroptionsBRIGHT RED. METALLIC SAVANNAH GREEN. METALLIC STRATO BLUE. METALLIC DARK GREY
CommentsDURING 1978 HONDA WAS ALREADY LEGENDARY FOR THEIR STEP THRU SCOOTER BIKES. THE PERFORMANCE THEY ACHIEVED THROUGH TECHNICAL ADVANCMENTS FROM THEIR SMALL OVERHEAD CAMSHAFT MOTORS WAS INCREDIBLE. SIMILIAR MODELS ARE STILL AVALIABLE TODAY
StarterKick

Physical Measures & Capacities

Dryweight85.0 kg (187.4 pounds)
Frontpercentageofweight40
Fuelcapacity5.50 litres (1.45 gallons)
Groundclearance130 mm (5.1 inches)
Overallheight995 mm (39.2 inches)
Overalllength1,830 mm (72.0 inches)
Overallwidth640 mm (25.2 inches)
Powerweightratio0.0882 HP/kg
Rearpercentageofweight60
Reservefuelcapacity1.00 litres (0.26 gallons)
Seatheight790 mm (31.1 inches) If adjustable, lowest setting.
Weightincloilgasetc91.6 kg (201.9 pounds)

About Honda

Country of Origin: Japan
Founder: Soichiro Honda (with Takeo Fujisawa as business architect)
Best Known For: From Super Cub ubiquity to RC-era racing dominance; CB/CRF/Gold Wing families and bulletproof reliability

Company History

No marque has touched more riders than Honda. The Super Cub rewrote mobility—tens of millions built, step-through convenience, engines that survive astonishing neglect. Behind the charm sat ruthless engineering: metallurgy, tolerances, and manufacturing systems that made reliability a baseline, not a feature. Honda raced to learn: from Isle of Man to modern MotoGP, RC machines taught lessons in breathing, friction reduction, and chassis stiffness that flowed into streetbikes. The 1969 CB750 brought the superbike age; the Gold Wing defined long-distance civility; the Fireblade reinvented power-to-weight; and CR/CRF dirt bikes set standards for off-road agility. Corporate culture prized kaizen and respect for the user—controls that feel intuitive, parts support that keeps 1970s bikes alive, and engines that start after winters of silence. Honda also led in safety and emissions, pushing EFI, ABS, and catalytic solutions early and at scale. Historically, Honda democratized excellence: making the extraordinary ordinary so that a delivery rider in Delhi and a tourer in Denver share the same trust in their machines. The brand’s throughline is simple: engineer the friction out of ownership so the ride can take center stage.

Other Years

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