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Honda Nighthawk 750





himanshu750.jpgThe Honda Nighthawk 750 is the grandson of the most significant motorcycle ever made-- the 1970 Honda CB750.
The Nighthawk stays true to its heritage: Air cooled 750cc inline-four engine, double-cradle frame, single disk front and drum rear brake, and chain drive. The differences are ones of evolutionary refinement. It has hydraulic valve adjusters for zero-maintenance valves. Electronic ingition means there's no more fiddling with the idle speed. The engine's width is narrower as Honda has relocated the alternator behind the cylinders. They also added a small oil cooler to supplement the air cooling. Wheels are cast aluminum rather than spoked. The exhaust is a more modern four-into-two variety.

This is a do-it-all bike. It doesn't do anything with exquisite skill but it does everything reasonably well and for that it deserves a lot of credit. In stock form it's a nimble commuter. Attach a windscreen and luggage and you've got a lightweight touring bike. It's fun to drive too. Though it's no racer it is quick enough and the handling is reasonable and responsive. It feels lighter than it really is. The Nighthawk's reliability is legendary. It demands as little attention as any motorcycle and maintenance is cheap. Change the oil regularly and it will run forever.
(The above taken from
David's Motorcycle Reviews)

Unfortunately the last production year for the Nighthawk 750 was 2003.





Specs & Performance


1982 CB750SC
MSRP -- $3098
PERFORMANCE

Standing Start 1/4 mile
13.109 seconds_@_102.62 mph
Engine rpm @ 60 mph, top gear
4344
Average fuel consumption rate
42.2 mpg (17.9 km/l
Cruising range, main / reserve
139 / 55 miles
Load capacity (GVWR less curb weight)
371.5 lbs. (168.5 kg)
Maximum speed in gears @ engine redline
(1) 49.9 (2) 70.7 (3) 90.9 (4) 109.0 (5) 131.2
ENGINE
Type
4 Stroke, transverse four cylinder with two overhead camshafts, chain-driven
Bore and stroke
62.0 x 62.0 mm (2.44 x 2.44 in.)
Piston displacement
749cc (45.7 cu. in.)
Compression ratio
9.0:1
Carburetion
4 Keihin 30mm constant-vacuum with accelerator pump.
Exhaust system
Four into four
Ignition
Battery-powered, inductive, magnetically triggered and electronically advanced.
Air filtration
Paper element disposable
Oil filtration
Paper element disposable
Oil capacity
4.8 qts (4.5 liters)
65.57 @ 9000
41.54 ft. lbs @ 7500
TRANSMISSION
Type
Five-speed, constant-mesh, multi-plate wet clutch
Primary drive
Hy-Vo chain and spur gears, 2.38:1
Final drive
# 530 sealed O-ring chain, 2.39:1
Gear ratios, overall
(1) 14.40 (2) 10.17 (3) 7.91 (4) 6.59 (5) 5.48
CHASSIS
Type
Dual downtube, full-cradle, mild steel frame
Suspension, front
Leading-axle coil / air spring fork with anti-dive yielding 154mm (6.1 in.) travel
Suspension, rear
Swing arm, (2) VHD (Variable Hydraulic Damping) shocks with five spring preload adjustments yielding 93mm (3.7 in.) travel
Wheelbase
60.8 in. (1545mm)
Rake / trail
29.5 degrees / 4.7 in. (120mm)
Brake, front
Hydraulic, dual disc, (2) 276mm (10.87 in.) rotors with dual-piston calipers
Brake, rear
Rod-actuated drum
Wheel, front
Cast, 2.50 x 18
Wheel, rear
Cast, 3.00 x 16
Tire, front
MT 120/90 x 18 Dunlop Qualifier F11
Tire, rear
M140 x 16 Dunlop Qualifier K127
Seat height
31.2 in. (792mm)
Ground clearance
6.4 in. (163mm)
Fuel capacity, main / reserve
3.3 / 1.3 gal. (12.5 / 4.9 liters)
Curb weight, full tank
573.5 lbs. (260.1 kg)
Test weight
733.5 lbs. (332.7 kg)
ELECTRICAL
Power source
Three-phase AC generator
Charge control
Solid state
Headlight beams, high / low
60 / 55 watts
Tail / stop lights
(2) 8 / 27 watts
Battery
12 V 14 AH
INSTRUMENTS
Includes:
Speedometer, odometer, tripmeter, tachometer, fuel gauge. Indicators for low oil pressure, neutral, high beam and turn indicators
Speedometer error
30mph indicated, actual 29.43
60mph indicated, actual 58.74

91-97 Nighthawk 750
Specifications

Dimensions
Overall length
86.0 in.
Wheel base
59.3 in.
Overall width
31.5 in.
Ground clearance
5.5 in.
Overall height
44.7 in.
Dry weight
463 lb.
Seat height
30.7 in.
Curb weight
498 lb.
Footpeg height
12.6 in.
Max weight capacity
364 lb.
Frame
Frame type
Double cradle
Fuel tank capacity
4.76 US gal (18 liters)
Front suspension
Telescopic fork
Reserve capacity
0.79 US gal. (3.0 liters)
Front wheel travel
5.5 in.
Front Brake
Hydraulic disc brake
Rear suspension
Swingarm
Rear brake
drum
Rear wheel travel
4.3 in.
Caster angle
29 °
Rear damper
Dual spring & shock
Trail length
4.6 in.
Engine
Bore & stroke
2.6 x 2.1 in. (67 x 53 mm)
Lubrication system
Forced pressure & set sump
Displacement
45.6 cu-in. (747cc)
Oil pump type
Trochoid
Compression ratio
9.3:1
Cooling system
Air cooled
Valve train
DOHC chaindrive with rocker arm
Air filtration
Paper filter
Intake valve opens at
0 ° BTDC
Oil filter
Paper filter (Fram PH6017A)
Intake valve closes
35 ° ABDC
Engine weight
179.2 lb.
Exhaust valve opens
30 ° BBDC
Firing order
1-2-4-3
Exhaust valve closes
-5 ° ATDC
Cylinder arrangement
Inline 4 L1-2-3-4R
Carburetor
Carburetor type
4 CV (constant vacuum)
Throttle bore
1.3 in. (34mm)
Drive Train
Clutch system
Multi-plate wet
Gear ratio 1st
3.00:1 (42/14)
Clutch operation
manual
Gear ratio 2nd
2.056:1 (37/18)
Transmission
5 speed
Gear ratio 3rd
1.545:1 (34/22)
Primary reduction
1.780 (73/41)
Gear ratio 4th
1.240:1 (31/25)
Secondary/third reduction
N/A