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In addition to cars, all-terrain vehicles and motorcycles, Suzuki produces a range of four-stroke outboard motors. Beginning with the development of the D55 motor model in 1965, Suzuki has consistently improved their motors with the introduction of elements such as the magnetic ignition switch and electronic fuel injection. Suzuki's outboard motors vary in levels of torque, which, powered by the engine or motor, is a vector that measures the amount of rotational effort exerted at the crankshaft.
DF300 and DF250SS
Suzuki's DF300 is a four-stroke, six-cylinder, 300 horsepower motor that is the first of its kind in the marine industry. It has four valves per cylinder and a self-adjusting, oil-bathed chain drive with variable valve timing. It has a displacement of 245.6-cubic-inches and a bore and stroke of 98-by-89 mm. The operating range of this motor is 5,700-to-6,300 rpm. The 250SS motor model shares the specifications of the DF300 model but is less powerful at 250 hp.
DF250, DF225 and DF200
Suzuki's 250 outboard motor model is 250 hp, with six four-valve cylinders and a self-adjusting, oil-bathed chain drive with variable valve timing. With an operating range of 5,500-to-6,100 rpm, the displacement is 220.5 cubic inches, and the bore and stroke measure 95 by 85mm. The 225 model has identical torque-related specifications but is less powerful, at 225 hp. It has an operating range of 5,000-6,000 rpm. The 200 model motor is identical to the 225 but is 200 horsepower.
DF175 and DF150
These two models are among the largest four-stroke, four-cylinder motors. With four valves for each inline cylinder, the DF175 is 175 horsepower and the DF150 is 150 horsepower. These motors have self-adjusting, oil-bathed chain drives with variable valve timing. The bore and stroke of both is 97 by 97mm, and the displacement is 174.9-cubic-inches. This added displacement increases the velocity and acceleration of these motors. The DF175 operates at a range of 5,500-6,100 rpm, and the DF150 operates within the less powerful range of 5,000-6,000 rpm.
DF140, DF115 and DF100
Suzuki's outboard motors steadily decrease in power and torque. The 140 hp DF140 has four in-line cylinders with four valves each, a 124.7 cubic inch displacement and an 86-by-88 bore and stroke. This motor operates between 5,600 and 6,200 rpm and has a self-adjusting, oil-bathed timing chain train drive.
The DF115 and DF100 are 115 and 100 hp. These outboard motors have identical torque and power specifications, with four in-line four-valve cylinders, a 118.9-cubic-inch displacement, 84-by-88mm bore and stroke and self adjusting oil-bathed timing chain train drives. Both of these models have a 5,000-6,000 rpm operating range.
DF90, DF80 and DF70
The DF90, DF80 and DF70 Suzuki outboard motors are 90, 80 and 70 horsepower and share nearly identical power and torque specifications. With a displacement of 91.7-cubic-inches, these motors have four in-line four-valve cylinders, self-adjusting, oil-bathed timing chain train drives and 75-by-85mm bore and stroke. While the DF90 operates between 5,300 and 6,300 rpm, the DF80 and DF70 have ranges of 5,000-6,000 rpm.
DF60, DF50 and DF40
Suzuki's DF60 model is 60 horsepower and has three, four-valve cylinders. The displacement is 57.4-cubic-inches, and the bore and stroke measure 72.5 by 76mm. This motor has an operating range of 5,300-6,300 rpm.
The DF50 and DF40 motors are 50 and 40 horsepower and have three in-line four-valve cylinders. These motors are slightly smaller than the DF60, with a 49.7-cubic-inch displacement and 71-by-68.6mm bore and stroke. With self-adjusting, oil-bathed timing chain train drives, the DF50 operates at 5,900-6,500 rpm and the DF40 operates at 5,200-5,800 rpm.