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The 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.

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

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

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

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)

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

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

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 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.

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 type

4 CV (constant vacuum)

Throttle bore

1.3 in. (34mm)

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	Gear ratio 5th	1.074:1 (29/27)
Final reduction	2.533 (38/15)	Gearshift pattern	1-N-2-3-4-5

Engine Oil Capacity at draining	2.8 U.S. quarts (2.7 liters)	Recommended Oil for various temperature ranges:
Engine Oil Capacity with filter change	3.1 U.S. quarts (3.0 liters)	32 ° F to >115 ° F	SAE 20W-50
Oil pressure @176 ° F	90 psi @ 6,000 rpm	32 ° F to >110 °F	SAE 20W-40
Recommended Oil	Honda 4-stroke oil or equivalent. API SF or SG, SAE 10W-40	5 ° F to 110 ° F	SAE 10W-40
		5 ° F to 90 ° F	SAE 10W -30

Min front tire tread depth	0.06 in. (1.5mm)	Drive chain slack	3/4 in. to 1-3/16 in. (20-30mm)
Min rear tire tread depth	0.08 in. (2.0mm)	Drive chain size/link:
Cold Tire pressure (up to 200 lb. load)	front 33 psi rear 33 psi	DID chain	DID 525 V9/110
Cold Tire pressure (up to max weight capacity)	front 33 psi rear 41 psi	RK chain	RK 525 SM4/110
Tire type, front	Dunlop K505F	Front tire size	110/80-18 58H
Tire type, rear	Dunlop K505	Rear tire size	140/70-17 66H

Alternator charging coil	0.4 - 0.6 ohms	Front turn signal/running light	12 V 32/3 CP
Alternator field coil	2.1 - 2.6 ohms	Rear turn signal/light	12 V 32 CP
Regulator / rectifier regulated voltage/amperage	13.0 - 15.0 V/below 0.5A/2,000 rpm	Instrument lights	3 x 12 V 1.7 W
Battery capacity	12V - 14 Ah	Oil warning light	12 V 3 W
Normal Batt charging rate	1.4 A / 10h	Side stand warning light	12 V 3 W
Main fuse	30 A	High beam indicator light	12 V 3 W
Other fuses	2 x 10 A, 1 x 15 A	Turn signal indicator light	12 V 3.4 W
Headlight (high/low beam)	12 V 60/55 W	Neutral indicator light	12 V 3 W
Tail / brake light	12 V 3/32 CP

Standard NGK	DPR 8EA-9	Advance Stop	33 ° / 4,000 rpm
High speed NGK	DPR 9EA-9	Full advance	33 ° / 4,000 rpm
Standard Nippondenso	X24EPR-U9	Ignition coil resistance:
High speed Nippondenso	X27EPR-U9	primary at 68 ° F	2.6 - 3.2 ohms
Spark Plug gap	0.03 - 0.04 in. (0.8 - 0.9mm)	secondary with plug cap	18 - 22 kohms
Ignition timing "F" mark	10 ° BTDC	secondary without plug cap	13 - 17 kohms
Advance Start	10 ° / 1,500 rpm	Ign. pulse gen. resistance	297 - 363 ohms