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1993 GTS 1000
1992 TZ 250 D
1984 FJ 1200
1982 XJ 900
1982 XJ 650 Turbo Seca
1980 250 XT
1968 DT 1

  Yamaha XJ 900

EngineIn-line four-cylinder, tilted forward
Displacement (bore * stroke)853 cm³ (76,0 mm * 60,5 mm)
Compression9,6 : 1 (91 octane)
Engine controldohc, 4 V, bucket tappets
Mixture preparation4 SU-horizontal draught carburettor, Mikuni BS 35
IgnitionBattery transistor ignition
LubricationPressure circulation, oil cooler, wet sump, 2.8 litres incl. main filter, circulation with transmission
Torque80 Nm at 7500 rpm
Performance71 kW (97 HP) at 9000 rpm
ConstructionTransverse engine, cardan shaft drive
Clutch8 disks, wet
TransmissionFive-speed, synchronised, drum switch
Wheelbase1.480 mm
Front suspensionFork, telescopic
Rear suspensionDual swingarm
BrakesDisks, 2 front, 1 rear
Wheels f/r100/90 V 18 / 120/90 V 18
Length2.215 mm
Width735 mm
(Seat) height790 mm
Tank capacity22 litres
Kerb weight242 kg, fully fueled
Payload194 kg
Top speedApprox. 220 km/h
Years of manufactureFrom 1982
Electric system12 V/ 14 Ah/ 35 A

We have limited ourselves to the fullest possible data of the original version. There was still an increase in displacement to just under 900 cc. But the performance offer became rather lesser together with the rated speed in the last version from 1994. More wheelbase, weight and length at slightly taken back top speed. At the torque can be seen a somewhat more favourable distribution.

At 4 carburettors maintenance is generally somewhat more elaborate with adjustment and especially synchronisation work every 6000 kilometres, as well the change of service oils. The valve clearance must be adjusted every 12,000 km and a new oil filter is due. A change of brake hoses could also be good for the car, however, no longer every 4 years nowadays.

The transverse engine solves its width problem as it as usual the two camshafts drives via a chain in the middle, but affords no clutch at one of its ends. For this purpose, the torque between the left two cylinders (3 and 4) is transmitted to the clutch lying behind and then to the input shaft of the transmission. From its output shaft, it then goes via an intermediate transmission and a damping element to the cardanshaft staggered to the left.

It is not mentioned specifically in the maintenance works, but the telescopic fork also requires particularly associated with losses a kind of oil change also, in this case each a quarter litre per fork leg tube. For this are needed the dismantling of the handlebar and after opening the drain screws still certain pumping movements. At the end of the assembly is to generate the required air pressure.

The cardan drive turns out to be relatively low-maintenance once again, when one e.g. compares it with a possibly even open guided chain. Certainly, a part of the cardan shaft and the full weight of the end transmission contribute to the increase of the unsprung weight. Case of the XJ 900 it's done quite filigree. A single-arm swingarm for easier disassembly of the rear wheel does not exist here. The wheels are so narrow that a dynamic balancing by an the appropriate machine is not necessary. 10/15