The Honda C90 K3 motorcycle specifications include a 89 cc (5.43 cu in) engine, a 3-speed gearbox, and a listed weight of 91.6 kg (201.9 lb).
Key specifications
How the Honda C90 K3 compares
This compares the motorcycle with all Honda models in this specifications database. The blue marker is this model and the grey line is the Honda database average.
About 84% lower than the Honda database average. Around the 6th percentile across Honda models.
About 54% lighter than the Honda database average. Around the 7th percentile across Honda models.
Very close to the Honda database average. Around the 58th percentile across Honda models.
About 59% smaller than the Honda database average. Around the 12th percentile across Honda models.
Honda database percentile rankings
Percentiles show where this motorcycle sits across the Honda specifications database. They are descriptive database rankings, not performance ratings.
89 cc — larger displacement than about 6% of Honda models.
91.6 kg — heavier than about 7% of Honda models, or lighter than about 93%.
790 mm — taller than about 58% of Honda models.
5.5 L — larger than about 12% of Honda fuel tanks in this database.
Dimensions compared with Honda average
Each measurement is compared with the average value across Honda models where that dimension is available.
1,830
2,078
12% below average.
640
827
23% below average.
995
1,161
14% below average.
1,190
1,431
17% below average.
790
780
Close to average.
130
184
29% below average.
Mechanical overview
Additional useful specifications
| Front tire size | 2.00-17 |
|---|---|
| Rear tire size | 3.00-17 |
| Estimated theoretical fuel range | 220 km |
| Bore/stroke ratio | 1.10:1 (Oversquare) |
Model information
| Year released | 1978 |
|---|
Engine specifications
| Engine type | Single cylinder, four-stroke |
|---|---|
| Displacement | 89 cc (5.43 cu in) |
| Torque | 6.0 Nm (0.6 kgf-m or 4.4 ft.lbs) @ 6,000 rpm |
| Bore × stroke | 50.0 x 45.6 mm (2.0 x 1.8 inches) |
| Compression ratio | 8.2:1 |
| Valves per cylinder | 2 |
| Cooling system | Air |
| Fuel system | Carburettor. Keihin seiki |
| Fuel control | Overhead Cams (OHC) |
| Ignition | contact breaker points |
| Starter | Kick |
| Lubrication | Wet sump |
Transmission and drivetrain
| Gearbox | 3-speed |
|---|---|
| Final drive | Chain (final drive) |
| Clutch | Multi plate wet automatic |
Chassis and suspension
| Frame | Pressed steel monoque with engine part of loadbearing |
|---|---|
| Front suspension | Hydraulically dampened leading link forks |
| Rear suspension | Hydraulically dampened with compression spring |
| Front wheel travel | 75 mm (3.0 inches) |
| Rear wheel travel | 100 mm (3.9 inches) |
| Rake | 27.0° |
| Trail | 75 mm (3.0 inches) |
Brakes, wheels and tires
| Front brakes | Expanding brake (drum brake). Twin expanding shoe |
|---|---|
| Rear brakes | Expanding brake (drum brake). Twin expanding shoe |
| Front tire | 2.00-17 |
| Rear tire | 3.00-17 |
Dimensions and weight
| Wet weight | 91.6 kg (201.9 lb) |
|---|---|
| Dry weight | 85 kg (187.4 lb) |
| Seat height | 790 mm (31.1 inches) |
| Overall length | 1,830 mm (72.0 inches) |
| Overall width | 640 mm (25.2 inches) |
| Overall height | 995 mm (39.2 inches) |
| Wheelbase | 1,190 mm (46.9 inches) |
| Ground clearance | 130 mm (5.1 inches) |
Fuel and emissions
| Fuel capacity | 5.50 L (1.45 US gal) |
|---|---|
| Reserve fuel capacity | 1.00 L (0.26 US gal) |
| Fuel consumption | 2.50 L/100 km (40.0 km/l or 94.09 mpg) |
| Greenhouse gases | 58.0 CO 2 g/km. (CO2 – Carbon dioxide emission) |
Performance
| Top speed | 80.0 km/h (49.7 mph) |
|---|---|
| Power/weight ratio | 0.0882 hp/kg |
Other specifications
| Color options | BRIGHT RED. METALLIC SAVANNAH GREEN. METALLIC STRATO BLUE. METALLIC DARK GREY |
|---|---|
| Exhaust system | Sinle stainless steel pipe |
| Comments | During 1978 Honda was already legendary for their step thru scooter bikes. The performance they achieved through technical advancements from their small overhead camshaft motors was incredible. Similar models are still available today. |
Disclaimer: Specifications may vary by market, trim, production date and optional equipment, and scraped or historical data can contain errors. Comparison and percentile values are calculated from Honda models in this specifications database. Always double-check important specifications against the motorcycle owner’s/service manual and official Honda information before relying on them. Visit the official Honda website.