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Suzuki DR 750S Big

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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°
Trail 138 mm / 5.4 in
Steering Angle 43°
Turning Radius 2.3 m / 7.5 ft
Dimension Length: 2270 mm / 89.4 in
Width:     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 ¼ 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

No standard bike has the larger cylinder displacement than DR Big. The engine is although narrower than any twin offroad engine. The enormous single suits well for those who think twins are too clumsy and need more power than the smaller singles can offer. Naturally, no large single cylinder like low. But slow cruising with the highest gear is not what DR Big was meant to. That’s the limitation you have to live with if you buy a DR Big.

No, DR Big is a bike for riders who don’t want to ride fast, and not just on the tarmac. DR Big is a mass production model of the DR-Z, rode by Gaston Rahier at the Paris-Dakar rally
If you have long legs, the form of the gasoline tank could make your life a bit miserable. You knees simply wouldn’t fit into the sunken tank sides. The problem was solved in 1991 year’s model when the gasoline tank was totally redesigned.

DR800 replaced the DR750 in 1990. The engine got six mm longer stroke (the bore was unchanged 105 mm), the cylinder displacement increased from 727 cc to 779 cc. Otherwise it was still just about the same bike.

DR Big saw a major update in 1991. The gasoline tank was decreased with five Litres , now being ”only” 24 Litres . The form of the tank was also new; the scooping on the sides of the tank was made wider for riders with long legs. The saddle was wider and more comfortable and even the suspension was upgraded.

For being a large offroad bike the DR Big has always had an unusually well balanced suspension and long suspension travel. You can actually take it for a spin on a cross circuit without risking a heart attack.

The models before 1991 are the best choice for really long distances with their enormous gasoline tank and the possibility of getting lots of packing with you. The exhaust was placed relative low that makes it possible for fastening saddlebags without risking burning them up. On the other hand, the saddle is not that comfortable on the older models.

Although the models after 1991 were more comfortable and perhaps better looking, the new exhausts (now two pipes instead of one) were not as practical and even raised the weight balance.