Yamaha XJ750: history, specs, pictures

The Yamaha XJ750 Maxim X was a four cylinder boxer, four-stroke Road motorcycle produced by Yamaha between 1981 and 1986. It could reach a top speed of 116 mph (186 km/h). Max torque was 54.60 ft/lbs (74 Nm) @ 8000 RPM. Claimed horsepower was 88.11 HP (65.7 KW) @ 9000 RPM.

Yamaha XJ750
Also called XJ750 Maxim X, XJ 750 Maxim X, XJ750S, XJ 750 S, XJ750 Seca, XJ 750 Seca, XJ 750
Production 1981 - 1986
Class Standard
four cylinder boxer, four-stroke
Bore / Stroke 68.0mm x 51.6mm
Top Speed 116 mph (186 km/h)
Horsepower 88.11 HP (65.7 KW) @ 9000RPM
Torque 5.46 ft/lbs (7.4 Nm) @ 8000RPM
Fuel System carburetor. (4) standard bs33mm mikuni cv
Ignition tci
Spark Plug NGK BP7ES '81-83
Battery YUASA YB14L-A2 '81-83
Transmission Gear box: 5-speed

Final Drive: shaft drive (cardan)

Clutch: wet / multidisc
Final Drive Shaft
Suspension Front: telescopic
Rear: swing arm
Brakes Front: double disc. 4 piston caliper
Rear: expanding brake (drum brake). drum brake
Front Tire 1/-19-57h
Rear Tire 1/-16-67h
Wheelbase 59.84 inches (1520 mm)
Length 87.99 inches (2235 mm)
Width 30.51 inches (775 mm)
Height 45.67 inches (1160 mm)
Seat Height 29.92 inches (760 mm)
Weight 473.99 pounds (215.0 Kg) (dry), 232.0 kg (wet)
Oil Capacity 0.92 Gallon (3.50 Liters)
Oil Filter K&N KN-144
Recommended Oil Yamalube 10w-40
Fuel Capacity 3.43 Gallon (13.00 Liters)
Fuel Consumption 5.70 liters/100 km (17.5 km/l or 41.27 mpg)
Manuals Service Manual


The engine was a liquid cooled four cylinder boxer, four-stroke. A 68.0mm bore x 51.6mm stroke result in a displacement of just 749.0 cubic centimeters. Fuel was supplied via a double overhead cams/twin cam (dohc).


The bike has a 5-speed transmission. Power was moderated via the wet / multidisc.


It came with a 1/-19-57h front tire and a 1/-16-67h rear tire. Stopping was achieved via double disc. 4 piston caliper in the front and a expanding brake (drum brake). drum brake in the rear. The front suspension was a telescopic while the rear was equipped with a swing arm. The XJ750 Maxim X was fitted with a 3.43 Gallon (13.00 Liters) fuel tank. The bike weighed just 473.99 pounds (215.0 Kg). The wheelbase was 59.84 inches (1520 mm) long.

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