Honda C90 K3
1978Scooter

Honda C90 K3

Key specifications

Engine
89 cc
Power
8 HP
Torque
1 Nm
Weight
85 kg
Fuel type
petrol
Fuel capacity
1.5 L
Transmission
3-speed
Seat height
31 mm
Front brakes
Expanding brake (drum brake). twin expanding shoe
Rear brakes
Expanding brake (drum brake). twin expanding shoe

Overview

Introducing the 1978 Honda C90 K3, a stunning example of Honda’s mastery in the scooter category during the late 1970s. This model epitomizes the charm of classic Japanese engineering, combining practicality with an enduring style that has made it a beloved choice among enthusiasts and collectors alike. As part of Honda's acclaimed line of step-thru scooters, the C90 K3 was designed to cater to urban commuting needs while also providing a spirited ride that could handle the open road. With a compact stature and a lightweight frame, this scooter is perfect for both novice riders and experienced enthusiasts looking for a reliable and fun way to navigate city streets or weekend adventures. Under the skin, the C90 K3 boasts a lively 89cc single-cylinder four-stroke engine that delivers a respectable 7.5 horsepower at 9,500 RPM. Its spirited performance is matched by an impressive fuel efficiency of approximately 94.09 miles per gallon, making it an economical choice for riders who prioritize efficiency. The 3-speed gearbox and multi-plate wet automatic clutch work in harmony, ensuring smooth transitions and effortless acceleration. With a top speed of 49.7 mph, the C90 K3 is not just a scooter; it’s a gateway to exploration, whether you’re zipping through traffic or cruising along winding country roads. The C90 K3 shines with its innovative features and thoughtful design elements. The pressed steel monocoque frame, which integrates the engine as a load-bearing component, enhances rigidity while keeping the weight down to a nimble 187.4 pounds. The hydraulically dampened leading link front forks and rear suspension ensure a comfortable ride over uneven surfaces, while the twin expanding shoe drum brakes provide reliable stopping power. Versatile and stylish, the C90 K3 is available in vibrant color options like Bright Red, Metallic Savannah Green, and Metallic Dark Grey, appealing to riders with varied tastes. Honda's commitment to quality and performance in this model is a testament to their legacy in the scooter segment. **

Pros

  • Excellent Fuel Efficiency: With a consumption rate of 2.50 liters per 100 km, the C90 K3 is perfect for budget-conscious riders who want to maximize their mileage.
  • Lightweight and Maneuverable: Weighing just 187.4 pounds, this scooter is easy to handle in urban environments, making it ideal for both new and experienced riders.
  • Classic Design: The stylish aesthetics and vibrant color options will turn heads, offering a nostalgic nod to the golden age of scooters.

Cons

  • Limited Power for Highway Use: With a top speed of 49.7 mph, the C90 K3 may struggle on faster roads, making it less suitable for long highway journeys.
  • Basic Features: Compared to modern scooters, the C90 K3 lacks advanced technology and conveniences such as fuel injection or electronic ignition.
  • Kick Start Only: The traditional kick starter may be less convenient for some riders accustomed to electric start systems found on contemporary models.

Technical details

Source specification data

Make
Honda
Model
C90 K3
Category
Scooter
Starter
Kick
Comments
G
1978
S
.
E
.
Color Options
D
.
N
.
E
.
Power
7.50 HP (5.5 kW)) @ 9500 RPM
Clutch
multi plate wet automatic
Max Rpm
10000
Torque
0.67 Nm (0.1 kgf-m or 0.5 ft.lbs) @ 6000 RPM
Gearbox
3-speed
Ignition
contact breaker points
Top Speed
80.0 km/h (49.7 mph)
Fuel System
Carburettor. keihin seiki
Bore X Stroke
50.0 x 45.6 mm (2.0 x 1.8 inches)
Compression
8.2:1
Displacement
89.00 ccm (5.43 cubic inches)
Cooling System
Air
Engine Details
Single cylinder, four-stroke
Exhaust System
sinle stainless steel pipe
Fuel Consumption
2.50 litres/100 km (40.0 km/l or 94.09 mpg)
Greenhouse Gases
O2
g/km. (
O2
-
Carbon
dioxide emission)
Lubrication System
Wet sump
Valves Per Cylinder
2
Transmission Type Final Drive
Chain
Dry Weight
85.0 kg (187.4 pounds)
Seat Height
790 mm (31.1 inches) If adjustable, lowest setting.
Fuel Capacity
5.50 litres (1.45 gallons)
Overall Width
640 mm (25.2 inches)
Overall Height
995 mm (39.2 inches)
Overall Length
1,830 mm (72.0 inches)
Ground Clearance
130 mm (5.1 inches)
Power Weight Ratio
0.0882 HP/kg
Reserve Fuel Capacity
1.00 litres (0.26 gallons)
Weight Incl Oil Gas Etc
91.6 kg (201.9 pounds)
Rear Percentage Of Weight
60
Front Percentage Of Weight
40
Rake
27.0°
Trail
75 mm (3.0 inches)
Frame Type
pressed steel monoque with engine part of loadbearing
Rear Brakes
Expanding brake (drum brake). twin expanding shoe
Front Brakes
Expanding brake (drum brake). twin expanding shoe
Rear Suspension
hydraulically dampened with compression spring
Front Suspension
hydraulically dampened leading link forks
Rear Wheel Travel
100 mm (3.9 inches)
Front Wheel Travel
75 mm (3.0 inches)
Rear Brakes Diameter
110 mm (4.3 inches)
Front Brakes Diameter
110 mm (4.3 inches)

Available colors

BRIGHT RED. METALLIC SAVANNAH GREEN. METALLIC STRATO BLUE. METALLIC DARK GREY