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

Gear ratio 5th

1.074:1 (29/27)

Final reduction

2.533 (38/15)

Gearshift pattern

1-N-2-3-4-5

Oil

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

Wheels/Tires/Chain

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

Electrical

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

Ignition System

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

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