Suzuki DR750S Big

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Suzuki-DR750S-88.jpg
Suzuki DR750S Big
Manufacturer
Also called DR 750 S Big, DR750SE
Production 1987 - 1989
Class Dual purpose
Successor Suzuki DR800S Big
Engine
Four stroke, single cylinder, SOHC, 4 vaves
Compression ratio 105 x 84 mm
Top Speed 168.1 km/h / 104.5 mph
Horsepower 48.95 HP (36.5 KW) @ 6800RPM
Ignition Electronic, Suzuki PEI
Spark Plug NGK DPR9EA-9
Battery 12V 50.4kC, 14Ah
Transmission 5 Speed
Suspension Front: 38mm Telescopic, coil spring, air damped
Rear: Full floater rising-rate monoshock with adjustable preload.
Brakes Front: Single 280 mm disc, 2 piston caliper
Rear: 160 mm Drum
Front Tire 90/90-21 54S
Rear Tire 130/80-17 65S
Wheelbase 1505 mm / 59.3 in
Seat Height 876 mm / 34.5 in
Weight 175 kg / 389 lbs (dry), 195 kg / 430 lbs (wet)
Oil Filter K&N KN-137
Recommended Oil Suzuki ECSTAR 10w40
Fuel Capacity 29 Liters / 7.7 US gal / 6.4 Imp gal
Manuals Service Manual

The Suzuki DR Big750S was a single cylinder, four-stroke standard produced by Suzuki between 1988 and 1989. It could reach a top speed of 168.1 km/h / 104.5 mph. Claimed horsepower was 48.95 HP (36.5 KW) @ 6800 RPM.


From 1987-1990, the Suzuki DR-750 was the largest model in the DR line. Later replaced by the Suzuki DR800SE, it was too heavy for any serious off-roading, though it still was created with nods toward the DR-650. The bike's overall look is more like that of a street bike, but it's often seen with dirt-bike things such as a skid plate or hand guards.


Engine[edit]

The engine was a Air/oil cooled cooled Four stroke, single cylinder, SOHC, 4 vaves. The engine featured a 105 x 84 mm compression ratio.

Drive[edit]

Power was moderated via the Wet, multi-plate.

Chassis[edit]

It came with a 90/90-21 54S front tire and a 130/80-17 65S rear tire. Stopping was achieved via Single 280 mm disc, 2 piston caliper in the front and a 160 mm Drum in the rear. The front suspension was a 38mm Telescopic, coil spring, air damped while the rear was equipped with a Full floater rising-rate monoshock with adjustable preload.. The DR750S Big was fitted with a 29 Liters / 7.7 US gal / 6.4 Imp gal fuel tank. The bike weighed just 175 kg / 389 lbs. The wheelbase was 1505 mm / 59.3 in long.

Photos[edit]

Suzuki DR750S Big Suzuki DR750S Big Suzuki DR750S Big Suzuki DR750S Big

Overview[edit]

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 Liters , now being ”only” 24 Liters . 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.





Specifications[edit]

Make Model Suzuki DR 750S Big
Year 1987
Engine Type Four stroke, single cylinder, SOHC, 4 vaves
Displacement 727 cc / 44.4 cu in
Bore X Stroke 9.5:1
Compression 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 tire: 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 Tire 90/90-21 54S
Rear Tire 130/80-17 65S
Caster 39°
Trail 138 mm / 5.4 in
Steering Angle 43°
Turning Radius 2.3 m / 7.5 ft
Dimensions 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 Liters / 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

Videos[edit]