The Suzuki DR 750S Big, produced in 1987, is a four-stroke, single cylinder motorcycle with a capacity of 727cc. It has a compression ratio of 9.5:1 and is air/oil cooled, with a wet sump lubrication system. Electronic ignition by Suzuki PEI and a 12V 50.4kC, 14Ah battery give an output of 37kW/50hp at 6800 rpm with max torque of 55Nm/5.6kgf-m/40.6lb-ft at 5600 rpm. The transmission is a five-speed wet, multi-plate clutch with a chain final drive ratio of 3.200 (48/15) and a DAIDO DID520VL2 chain.
Front and rear suspension are comprised of telescopic, coil spring, air-damped and full floater rising-rate monoshock respectively, with 38mm and 220mm of travel. Braking is 280mm single disc with two piston caliper on the front, and a 160mm drum on the rear. Cast with 39-degree trail and 138mm steering angle, it has a turning radius of 2.3m/7.5ft.
At full capacity, the fuel tank carries 29 liters, consuming an average of 5.9 L/100 km. The bike is 2270mm long, 925mm wide and 1310mm in height, with a wheelbase of 1505mm and a ground clearance of 262mm. It weighs 175kg dry and 195kg wet with a maximum speed of 168.1km/h. In a quarter-mile sprint, it can reach 151.2km/h in 13.6 seconds. This model was reviewed by Adventure Group Test Motosprint in 1988 and 1989.
Technical specifications:
Make Model: Suzuki DR 750S Big
| Year | 1987 |
|---|---|
| Engine | Four stroke, single cylinder, SOHC, 4 vaves |
| Capacity | 727 cc / 44.4 cu in |
| Bore x Stroke | 9.5:1 |
| Compression Ratio | 105 x 84 mm |
| Cooling System | Air/oil cooled |
| Lubrication System | Wet sump |
| Induction | 33 mm Mikuni BST 33 SS carburetors |
| Ignition | Electronic, Suzuki PEI |
| Starting | Electric |
| Battery | 12V 50.4kC, 14Ah |
| Spark Plug | NGK DPR9EA-9 |
| Max Power | 37 kW / 50 hp @ 6800 rpm (rear tyre: 34.1 kW / 45.7 hp/6500 rpm ) |
| Max Torque | 55 Nm / 5.6 kgf-m / 40.6 lb-ft @ 5600 rpm |
| Clutch | Wet, multi-plate |
| Transmission | 5 Speed |
| Primary Reduction Ratio | 1.937 (62/32) |
| Gear Ratios | 1 st 2.461 (32/13) / 2nd 1.578 (30/19) 3rd 1200 (24/20) / 4th 0.956 (22/23) / 5th 0.800 (20/25) |
| Final Reduction Ratio | 3.200 (48/15) |
| Final Drive | Chain, DAIDO DID520VL2, 116 links |
| Front Suspension | 38mm Telescopic, coil spring, air damped |
| Front Wheel Travel | 240 mm / 9.4 in |
| Rear Suspension | Full floater rising-rate monoshock with adjustable preload. |
| Rear Wheel Travel | 220 mm / 8.7 in |
| Front Brakes | Single 280 mm disc, 2 piston caliper |
| Rear Brakes | 160 mm Drum |
| Front Tyre | 90/90-21 54S |
| Rear Tyre | 130/80-17 65S |
| Caster | 39 degrees |
| Trail | 138 mm / 5.4 in |
| Steering Angle | 43 degrees |
| Turning Radius | 2.3 m / 7.5 ft |
| Dimension | Length: 2270 mm / 89.4 inWidth: 925 mm / 36.4 in Height: 1310 mm / 51.6 in |
| Wheelbase | 1505 mm / 59.3 in |
| Ground Clearance | 262 mm / 10.3 in |
| Seat Height | 876 mm / 34.5 in |
| Dry Weight | 175 kg / 389 lbs |
| Wet Weight | 195 kg / 430 lbs |
| Fuel Capacity | 29 Litres / 7.7 US gal / 6.4 Imp gal |
| Consumption Average | 5.9 L/100 km / 17 km/l / 40 US mpg / 48 Imp mpg |
| Braking 60 km/h – 0 | 14.3 m / 46.9 ft |
| Braking 100 km/h – 0 | 42.0 m / 137.8 ft |
| Standing 1/4 Mile | 13.6 sec / 151.2 km/h / 94 mph |
| Top Speed | 168.1 km/h / 104.5 mph |
| Road Test | Adventure Group Test Motosprint 1988 Adventure Group Test Motosprint 1989 |
