Honda CB 750SC Nighthawk S

 

 

 

 

Make Model

Honda CB 750SC Nighthawk S

Year

1984 - 86

Engine

Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder.

Capacity

749 cc / 45.7 cu-in
Bore x Stroke 62 x 62 mm
Cooling System Air cooled,
Compression Ratio 9.3:1
Lubrication Wet sump

Induction

4x 30mm Keihin carburetors

Ignition 

CDI 
Starting Electric

Max Power

70 hp / 51.1 kW @ 7200 rpm

Max Torque

56.2 Nm / 41.5 ft-lb @ 7500 rpm
Clutch Wet plate

Transmission 

5 Speed
Final Drive Shadt
Frame Dual downtube, full cradle, mild steel

Front Suspension

37mm Air assisted forks
Front Wheel Travel 152 mm / 5.9 in
Rear Suspension Dual shocks
Rear Wheel Travel 93 mm / 3.6 in
Front Brakes 2x 276mm disc 2 piston caliper

Rear Brakes

180mm Drum

Front Tyre

110/90 H16

Rear Tyre

130/90 H16
Rake 29.6°
Trail 119 mm / 4.7 in
Dimensions Height  792 mm / 31.2 in
Length  2184 mm / 86.0 in
Width   800 mm / 31.5 in
Wheelbase 1544 mm / 60.8 in
Ground Clearance 163 mm / 6.4 in
Dry Weight 213 lg / 466 lbs

Wet Weight

226 kg / 497 lbs

Fuel Capacity 

16 Litres / US 4.2 gal

Consumption Average

42.2 mpg

Standing ¼ Mile  

13.1 sec / 102.6 mph

Top Speed

131.2 mph

The big 'Hawk incorporates all the high-performance/low-maintenance features which have made the Nighthawks so popular: a rubber-mounted in-line four-cylinder engine with oil cooler and 16 hydraulically adjusted valves, hydraulic clutch, automatic cam-chain tensioner and fully electronic ignition. The shaft drive is low on lash and maintenance free, and the 16-inch front. wheel, with TRAC anti-dive and an integrated fork brace, delivers nimble yet stable handling. The rear end is steadied by a pair of VHD shocks with four-way-adjustable rebound damping and box-section swingarm

Honda introduced the Nighthawk in the 1982 model year. It was initially produced in three sizes, the CB450SC, CB650SC & CB750SC models. All of these models borrowed heavily from the existing CB models, yet there were enough styling and substantive improvements to warrant designating them as new models. The CB450SC Nighthawk was an improvement upon the CB400, with an increase in engine size, improved internal lubrication system, hardened transmission gears, six speed tranmission, chain drive, cast wheels, disc front brake, air-adjustable fork, and VHD shocks. In it's first year, the 650 Nighthawk was equipped with Honda's last remaining SOHC in-line 4 cylinder engine, a 5 speed transmission, chain drive, and Comstar wheels. The CB750SC Nighthawk began it's run as a chain drive, 16 valve, DOHC in-line four cylinder, using the existing CB750 engine, but with everything else restyled and redesigned.

1983 brought many changes. The CB550SC Nighthawk , a cruiser styled Nighthawk, was introduced. The CB650SC Nighthawk was totally redesigned, producing a package which rivaled other companies 750's, including shaft drive, self adjusting cam chains, improved braking, handling, ergonomics, and visual appeal. The CB750SC was still offered but that would come to a hault when In 1983 the U.S. government, in an effort to keep Harley-Davidson afloat, imposed strict tariffs on imported motorcycles exceeding 700cc's. The 700 Nighthawk S was produced in 1984-86 in an effort to make a larger model Nighthawk that was still able to be sold in the U.S.

The 700s hit the showrooms with an all new engine, with DOHC and automatic cam chain tensioners. The bikes were shaft driven, and came standard with a small fairing, giving the bike a sportier appearance. This model remained until 1986, the last year of the Nighthawk's initial existence. The 550 was dropped after the 1983 model year. The 450 was not produced in 84, but was reintroduced in 1985 & 1986 model years. The 650 saw it's last production in the 1985 model year.

1987 brought sportier bikes, cruisers, and touring rigs, but no Nighthawks!! This intolerable situation persisted until 1990, when Honda, finally realizing the error of it's ways, resurrected the Nighthawk series in the 1991 model year. The bike was bike. The new version came in two sizes, a 250cc twin, and a 750cc inline 4 cylinder (size was not a problem now that Harley-Davidson was healthy again). Both of these machines were very well designed and affordable, a package hard to beat. Having achieved perfection at last, Honda has wisely left the design untouched , except for moving the location of the helmet lock in the 93 and later bikes, color changes, and a blacked out engine in 1997 and later bikes). The new 750 died off yet again leaving the Nighthawk name with the lesser 250cc. Today the "little bird" is used as a training bike for the MSF's(motorcycle safety foundation).