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Suzuki GS750 1976—1978
Suzuki GS750E 1979—1980
Suzuki GS750L 1979-1980
Suzuki GS750G 1980—1981
Suzuki GS750GL 1981


I have tried to tell the history of the different Suzuki GS750 models on this page. I would be grateful of any contributions — sales brochures, magazine ads, magazine articles, pictures, specs, facts, corrections etc. Please scan the material in JPEG format (large enough that all the details are visible) and send them to me. Please tell me the source and the publication date if possible. If you send me pictures of your own bike, please follow these instructions.

Suzuki GS750 '76

Suzuki 1976More Suzuki models from 1976
1976 Suzuki year code: A
 
Presented in October 1976, GS750 was the the first four-stroke engined Suzuki motorcycle after 22 years of only 2-stroke engines from Suzuki. The Colleda 90cc COX was the first, but the model was discontinued soon after its release in 1954 and after that Suzuki concentrated in deleveloping great two-stroke machines.

Although Suzuki had earlier been known as the home of two-strokes and for years let other manufacturors go ahead with their complicated and not-always-that-reliable four-strokes. Honda presented its CB750 already in the late sixties being a emmidiate success. Suzuki's answer, in form of the great new two-strokes in the T and later in the GT family were great bikes in the early seventies but were soon hopefully out-of-date. When even the RE5 with rotary engine turned out to be unsuccesful, it was time for Suzuki to think again. New harder emission regulations were arriving in the USA (California) killing the eventual plans of making even more powerful two-stroke machines. No, Suzuki had to swallow its pride and go with the flow. The name of the game was four-stroke.

Three four'strokes were introduced in the late '76: GS750, GS550 and GS400. All three of them had similar appearance and specification other than the GS400 had a cross-mount inline twin, six-speed gearbox and drum rear brake. The 550cc and 750cc versions had five speeds and disc brakes front and rear. All GS models had two valves per cylinder, double overhead camshafts, tubular double craddle frame, telescopic front and pivoted-fork rear suspension, fuel gauge, gear indicator and electric starter.

Suzuki Motor Company started the engineering of the four-stroke engine already in 1972 (some sources say 1973) and enormous sums of money was spent in designing a reliable and powerful engines. Today we know that the efforts paid off, the GS line had great engines that were durable and also beautiful.

At first the GS750 had a single disc brake at the front and steel wire wheels, but already in January 1977 the the model had double disc at the front. From the beginning the model had 5-speed gearbox, electric starter and 12V electric system with conventional battery and coil ignition (the CDI ignition wasn't introduced until to the GS750 until with the 16 valve models a couple of years later). The front suspension was conventional coil and oil-damped telescopic front fork, the rear suspension also conventional oil-damped swingarm with self-adjusting rear suspension. The swing arm had roller bearings instead of the bushings like in most other motorcycles, for durability.

The GSX750 engine with 65,0 mm bore and 56,4 mm stroke delivered 63—72 hp, depending on the export country. Even the restricted versions (for West-Germany etc.) were powerful enough to give the GS750 a top speed of 200 km/h, making the GS750 faster than any other Japanese motorcycle in 1976.
 
GS750 GS-750 GS750A GS-750AGS 750 1976
Overall Length: 2,225 mm (87.6 in)
Overall Width: 855 mm (33.7 in)
Overall Height: 1,170 mm (46.0 in)
Ground Clearance: 150 mm (5.9 in)
Wheelbase: 1,490 mm (58.7 in)
Dry Weight: 223 kg (492 lbs)
Engine type: Air-cooled 748 cc inline-4, DOHC, 8 valves. 72 hp/ 8,500 rpm, 60 Nm/ 7,000 rpm.

Click on the image for larger format.


Suzuki GS750 '77

Suzuki 1977More Suzuki models from 1977
1977 Suzuki year code: B
 
As already mentioned, the 1977 GS750DB had twin brake disc at the front, othervise the urgraded version (January 1977) shared the same specifications with the preview model of the GS750. Officially 1977 was the first model year for the GS750. I only presented the '76 GS750 because of the lack of the right side front disc.
 
'77 Suzuki GS750DBGS 750 1977
Overall Length: 2,225 mm (87.6 in)
Overall Width: 855 mm (33.7 in)
Overall Height: 1,170 mm (46.0 in)
Ground Clearance: 150 mm (5.9 in)
Wheelbase: 1,490 mm (58.7 in)
Dry Weight: 223 kg (492 lbs)
Engine type: Air-cooled 748 cc inline-4, DOHC, 8 valves. 72 hp/ 8,500 rpm, 60 Nm/ 7,000 rpm.

Click on the image for larger format.
Here's even larger picture.
See even the photo above.


Suzuki 1978More Suzuki models from 1978
1978 Suzuki year code: C
 
The GS750E (the correct model name for the '78 year's model is GS750EC) with star cast wheels was introduced in February 1978. The most obvious differences to the earlier model were new type of wheels. Otherwise the GS750E differed from the GS750 only in small details.
 

Suzuki GS750EGS 750 E 1978
Overall Length: 2 225 mm (87.6 in)
Overall Width: 870 mm. (34.3 in.)
Overall Height: 1 170mm (46.1 in)
Wheelbase: 1 490 mm (58.7 in)
Ground Clearance: 150 mm (5.9 in)
Dry Weight: 223 kg (492 lbs)
Engine type: Air-cooled 748 cc inline-4, DOHC, 8 valves. 72 hp/ 8.500 rpm, 60 Nm/ 7.000 rpm.

Click on the image for larger format.
Here's even larger picture.

Suzuki GS750EGS 750 E 1978
Overall Length: 2 225 mm (87.6 in)
Overall Width: 870 mm. (34.3 in.)
Overall Height: 1 170mm (46.1 in)
Wheelbase: 1 490 mm (58.7 in)
Ground Clearance: 150 mm (5.9 in)
Dry Weight: 223 kg (492 lbs)
Engine type: Air-cooled 748 cc inline-4, DOHC, 8 valves. 72 hp/ 8.500 rpm, 60 Nm/ 7.000 rpm.

Click on the image for larger format.
Here's even larger picture.


Suzuki 1979More Suzuki models from 1979
1979 Suzuki year code: N
 
The '79 GS750E was presented in December 1978 and was the last one of the eight-valve 750's (except for Japan, see further down on this page). The GSX750E with a 16-valve engine, released in January 1980, replaced the GS750E and the model was discontinued in August 1980. The bikes sold in 1980 were identical with the 1979 year's GS750EN and officially there wasn't any 1980 year's GS750ET model.

The '79 GS750EN (GS750E-II in Japan) was almost identical with the '78 year's GS750EC. The only differences I know of was that the choke handle was moved to the handlebars anf of course the flashier paintjob.

Here I will remind that the model name was never changed in the Northern America although the introduction of the 16-valve engine. For some reason, the ”X” that told about the new 4-valve cylinder head didn't find its way to the model names in USA and Canada and all the GSX models (with exception of the GSX-R series) remined GS ”over there”.
 

-78 GS750E GS-750E GS750 GS-750GS 750 E 1979
Overall Length: 2,225 mm (87.6 in)
Overall Width: 870 mm. (34.3 in.)
Overall Height: 1,170 mm (46.1 in)
Wheelbase: 1,490 mm (58.7 in)
Ground Clearance: 150 mm (5.9 in)
Dry Weight: 223 kg (492 lbs)
Engine type: Air-cooled 748 cc inline-4, DOHC, 8 valves. 72 hp/ 8,500 rpm, 60 Nm/ 7,000 rpm.

Click on the image for larger format.

Suzuki GS750EGS 750 E 1979
Overall Length: 2,225 mm (87.6 in)
Overall Width: 870 mm. (34.3 in.)
Overall Height: 1,170 mm (46.1 in)
Wheelbase: 1,490 mm (58.7 in)
Ground Clearance: 150 mm (5.9 in)
Dry Weight: 223 kg (492 lbs)
Engine type: Air-cooled 748 cc inline-4, DOHC, 8 valves. 72 hp/ 8,500 rpm, 60 Nm/ 7,000 rpm.

Click on the image for larger format.
Here's even larger picture.


Suzuki introduced a custom styled GS750L in 1979. It had same specifications as the GS750E but had high handlebars, stepped seat, leading axle front fork, smaller fuel tank (13 l/ 3.4 US gal) and short cut silencers. Sorry, no pictures available for the moment. See the 1981 GS750GL picture further down on this page. The model was sold until 1980 and was discontinued after the presentation of the 16-valve engined GSX750L.

Seat height: 793 mm (31.2 in), dry weight: 233 kg (514 lbs), 19-inch front tire, 17-inch rear tire.
 

'79 GS 750 N GS-750

A nice looking 1979 GS750N, sent by Neil Harding, Middlesbrough, England.

Photgraphed in Yorkshire, England.



Suzuki 1980More Suzuki models from 1980
1980 Suzuki year code: T
 
The GS750 engine lived on in Japan where it wasn't allowed to sell motorcycles larger than 750 cc piston displacement. Basically the GS750G was GS850G with a 748 cc engine and different handlebar, both models were sport tourers with shaft drive. The GS750G was presented in December 1979.
   
Suzuki GS750GGS 750 G 1980
Overall Length: 2,215 mm (87.2 in)
Overall Width: 875 mm (34.4 in)
Overall Height: 1,175 mm (46.3 in)
Wheelbase: 1,490 mm (58.7 in)
Dry Weight: 249 kg (548 lbs)
Engine type: Air and oil-cooled 748 cc inline-4, DOHC, 8 valves. 68 ps/ 8,500 rpm, 6.0 kg-m/ 6,500 rpm. Shaft drive. Available only in Japan.

Click on the image for larger format.
Suzuki GS750GGS 750 G 1980
Overall Length: 2,215 mm (87.2 in)
Overall Width: 875 mm (34.4 in)
Overall Height: 1,175 mm (46.3 in)
Wheelbase: 1,490 mm (58.7 in)
Dry Weight: 249 kg (548 lbs)
Engine type: Air and oil-cooled 748 cc inline-4, DOHC, 8 valves. 68 ps/ 8,500 rpm, 6.0 kg-m/ 6,500 rpm. Shaft drive. Available only in Japan.

Click on the image for larger format.


Suzuki 1981More Suzuki models from 1981
1980 Suzuki year code: X
 
Suzuki presented the second and final version of the GS750G in February 1981. Cosmetic changes only. This was the last model year for the GS750G.
 
Suzuki GS750GGS 750 G 1981
Overall Length: 2,215 mm (87.2 in)
Overall Width: 875 mm (34.4 in)
Overall Height: 1,175 mm (46.3 in)
Wheelbase: 1,490 mm (58.7 in)
Dry Weight: 249 kg (548 lbs)
Engine type: Air and oil-cooled 748 cc inline-4, DOHC, 8 valves. 68 ps/ 8,500 rpm, 6.0 kg-m/ 6,500 rpm. Shaft drive. Available only in Japan.

Click on the image for larger format.

The GS750GL was another Japanese home market model with the reliable eight-valve engine and shaft drive. The design of the GL was obviously more chopper influenced but mechanically the GS750G and GS750GL were similar. The model was introduced in May 1981.

I haven't found info of any other model years. It's possible that the '81 was the only model year for GS750GL. Probably the model until 1983.
 
GS750GL GS750L GS-750 GS750GS 750 GL 1981
Overall Length: 2,225 mm (87.6 in)
Overall Width: 855 mm (33.7 in)
Overall Height: 1,190 mm (46.9 in)
Wheelbase: 1,510 mm (59.4 in)
Dry Weight: 241 kg (530 lbs)
Engine type: Air and oil-cooled 748 cc inline-4, DOHC, 8 valves. 68 hp/ 8,500 rpm, 6.0 kg-m/ 6,500 rpm.

Click on the image for larger format.


GS750 specifications
Overall length: 2,225 mm (87.6 in.)
Overall width: 870 mm (34.3 in.)
Overall height: 1,170 mm (46.1in.)
Wheelbase: 1,490 mm. (58.7 in.)
Ground clearance: 150 mm (5.9 in.)
Dry weight: 223 kg (492 lbs.)
Fuel tank capacity: 18 l (4.8 gal.)
Reserve: 2 lt. (0.5 gal.)
Engine type: Air cooled inline-4, DOHC, 2 valves per cylinder
Bore x stroke 65,0 x 56,4 mm
Piston displacement: 748 cc
Compression ratio/test range: 8.7 :1 / 128—171 psi (15 psi var.)
Maximum opwer output: 72 hp/ 8,500 rpm
Maximum torque: 60 Nm/ 7,000 rpm
Carburetors: Mikuni VM26SS x 4
Carburetor settings: 1000 rpm. pilot air 1 1/4 T.
Carburetor float height: 0.98—1.1 in.
Main/pilot/needle/jet: 105 /22.5 /P-1 /5F21-3
Starter system: Electric and kick start
Lubrication type: wet sump, 3,400 cc. 10W-40 (20W-50) preferred
Oil pressure: 1.42 psi @ 3,000rpm.
Clutch type: Wet multi-plate
Transmission: 5-speed
Primary reduction: 2.152 (99/46)
Final reduction: 2.733 (41/15)
Gear ratios:
  Low 2.571 (36/14)
  2nd 1.777 (32/18)
  3rd 1.380 (29/21)
  4th 1.125 (27/24)
  5th 0.961 (25/26)
Top speed: 125 mph
Drive chain: 630SO 96 link, O-ring .8 - 1.2 in. free-play
Steering angle: 40 degrees
Caster: 63 degrees
Trail: 107 mm (4.21 in.)
Turning radius: 2.6 m (8.5 ft.)
Front brake: Disc
Rear brake: Disc
Front tyre: 3.25H X 19 4pr.
Rear tyre: 4.00H X 18 4pr. 120/18
Ignition type: Battery/coil
Ignition timing: 17° BTDC at 1500 rpm
Points settings: 0,35 mm / .014" point gap
Spark plug type: NGK B8ES
Spark plug gap: .024—.028"
Battery: 12V 14AH/10 hr.
Generator: 3 ph. AC





More: Suzuki GS750 brochures & adverts

More: Suzuki GS750 magazine articles

More: Suzuki GS750E brochure

More: Suzuki GS750E adverts

More: Suzuki GS750G brochures & adverts

More: Suzuki GS750GL brochures & adverts

More: Suzuki GS series

More: All Suzuki models


Sources: Aki Ainetdin (thanks for scanning photos), several Japanese websites (can't read or write their names), Michael's GS Classic, Ron Hurd's Website (the black '78 GS750E is his bike) etc.


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