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Yamaha XJ 750E-II

Make Model	Yamaha XJ 750E-II
Year	1983
Engine	Four stroke, transverse four cylinder, DOHC, 2 valves per cylinder
Capacity	749 cc / 45.6 cu-in
Bore x Stroke	65 х 56.5 mm
Cooling System	Air cooled
Lubrication	Wet sump
Compression Ratio	9.8:1
Induction	HSC33 carburetors
Ignition	Transistorized
Starting	Electric
Max Power	87 hp / 64.8 kW @ 9000 rpm
Max Torque	7.1 kgf-m / 51.3 lb-ft @ 7000 rpm
Clutch	Wet multiplate
Transmission	5 Speed
Final Drive	Shaft
Primary Reduction Ratio	1.672
Secondary Reduction Ratio	3.984
Gear Ratio	1st 2.187 / 2nd 1.500 / 3rd 1.152 / 4th 0.933 / 5th 0.811
Frame	Double cradle
Front Suspension	36mm Showa forks adjustable air pressure anti-dive resistance
Front Wheel Travel	150 mm / 5.9 in
Rear Suspension	Dual dampers adjustable for spring preload rebound damping
Rear Wheel Travel	97.5 mm / 3.8 in
Front Brakes	2x 300mm disc 2 piston calipers
Rear Brakes	Single disc
Front Tyre	100/90-18
Rear Tyre	120/90-18
Rake	27°
Trail	114 mm / 4.4 in
Wheelbase	1480 mm / 58.2 in
Seat Height	785 mm / 31 in
Dry Weight	214 kg / 471.4 lbs
Wet Weight	241 kg / 531.3 lbs
Fuel Capacity	22 Litres / 5.8 US gal

In 1983, the XJ750E-II was updated. It was built on a XJ900 frame, and the engine was updated with new technical developments.

The displacement is 749 cc with a bore x stroke of 65 x 56.5 mm, a stroke increase of 0.4 mm from the 1982 model. The DOHC engine was completely redesigned and the exhaust and intake valves were increased by 1 mm. It is also equipped with the YICS system.

This XJ750 breathes better thanks to a larger air filter and exhaust system borrowed from the XJ900 and 33mm diameter carburetors. The compression ratio goes from 9.2 to 1 to 9.8 to 1. All these modifications lead to an increase of 10% of the maximum power, which leads Yamaha to use the transmission by shaft and universal joints of the XJ900 , better adapted to these performances.

The chassis of this XJ750 uses the same rear suspension with programmed damping and spring preload settings, as well as the same axially ventilated disc brakes. On the other hand, the fork differs slightly with a larger diameter of the tubes, but without anti-dive device or pneumatic assistance.

The biggest innovation visible from the outside on the XJ900 and XJ750 is the fairing, no longer mounted on the fork, but fixed directly to the frame, and completed by an engine spoiler. Freed from the weight of the fairing and the dashboard, no longer supporting the wind pressure, the steering gains in precision and stability while the new fork crown provides more effective protection for the rider.

The fuel tank was increased to 22 litres.