1981 CB900C OEM Specifications
CB900C specs courtesy of Fernando Malvestuto (fmalve@mcg.org.ar)
| Engine | Four-stroke transverse four, air-cooled with dual chain-driven overhead camshafts and four valves per cylinder. | |
| Bore x Stroke | 64.5 x 69.0mm (2.54 x 2.72 in.) | |
| Displacement | 902cc (55.0 cu. in.) | |
| Compression Ratio | 8.8:1 | |
| Carburetion | (4) Keihin 32mm constant-vacuum | |
| Exhaust System | Four into four | |
| Air Filter | Dry cartridge, disposable | |
| Oil Filter | Paper element, disposable | |
| Ignition | Battery-powered inductive, magnetically triggered | |
| Oil Capacity (engine) | 4.5 liters (4.7 qts) | |
| Oil Capacity (transfer case) | 0.6 liters (0.6 qts) | |
| Oil Capacity (final drive) | 0.2 liters (0.2 qts) | |
| Fuel Capacity | 13.6/3.0 liters (3.6/0.8 gal) | |
| Electrical Power | Three-phase A.C. generator, 266 watts, solid-state regulator | |
| Battery | 12V 14Ah | |
| Headlight (high/low) | 60/55 watts | |
| Tail/stop lights | 8/23 watts | |
| Transmission | Dual-range five-speed, constant-mesh, wet clutch | |
| Primary Drive | Hy-Vo chain and straight-cut gear, 2.04:1 | |
| Secondary Drive | low..............Straight-cut
gear, 0.72:1
high..............Straight-cut gear, 0.62:1 |
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| Tertiary Drive | Shaft and spiral-bevel gear, 1.20:1 | |
| Final Drive | Shaft and spiral-bevel gear, 3.091:1 | |
| Gear Ratios, overall | low
range...........(1) 12.96 (2) 9.77 (3) 7.59 (4) 6.33 (5) 5.26:1
high range..........(1) 11.09 (2) 8.36 (3) 6.50 (4) 5.42 (5) 4.50:1 |
|
| Suspension | ||
| Front | Coil/air-spring leading-axle fork | |
| travel: | 154mm (6.1 in.) | |
| Rear | Swing arm with (2) coil/air-spring shocks | |
| travel: | 95mm (3.8 in.) | |
| Tires | ||
| Front | Tubeless 110/90-19 62H Dunlop Qualifier F11 | |
| Rear | Tubeless 130/90-16 67H Dunlop Qualifier 67H | |
| Brakes | ||
| Front | Hydraulic, dual disc, 276mm (10.9 in.) rotor with single-piston calipers | |
| Rear | Hydraulic, single disc, 296mm (11.7 in.) rotor with single-piston caliper | |
| Wheelbase | 1585mm (62.4 in.) | |
| Rake/Trail | 28.5º /114mm (4.5in.) | |
| Seat Height | 782mm (30.8 in.) | |
| Ground clearance | 160mm (6.3 in.) | |
| Weight with tank full | 276.4 kg (610 lbs) | |
| Load Capacity | 208.6 kg (460 lbs.) | |
| Performance | ||
| Standing 1/4 mile | 12.76 sec. @ 104.89 mph | |
| Fuel consumption | 27.2 mpg (15.8 km/l) | |
| Range (main/reserve) | 133.9/29.8 mi. (214.9/47.4 km) | |
| Calculated speed in gears | ||
| 9500 RPM (low/high) |
low range ..................(1) 52.8 (2) 70.1 (3) 90.2 (4) 108.2 (5) 130.2 mph high range .................(1) 61.8 (2) 81.9 (3) 105.4 (4) 126.4 (5) 152.2 mph |
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