Suzuki DR 750 S Big (1987)

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.

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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