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The YamahaXS400 A motorcyclewith a split-personality
!
The YamahaXS400 is very definitely a mororcycle
with a split-personality-butnot in the infamous
"Dr jekyll and Mr hyde" sense.
Both sidesof the
XS400 character are good sides, for the motorcycle is truly one that is hard to fault.
One side of the XS4O0characteris the longdistancetouring machine.A 90 mph cruisercapable of gobbling up the motorway miles at a more
than respectable
rateand still returningeconomical
fuel consumptionfiguresevenwhen well-loaded.
A bigger 16 litre tank is fitted (5 litres more than
last year'smodel) for the long-distancemen.
The other facetof the machine'spersonalityis
its role as an about-town commuter bike. the
XS400 is designedto trickle through the tramc ar
little morethan enginetickover speedand then to
respondto the throttle with a quick, smoothsurge
of accelerationwhen a gap in the traffic appears.
It is also designedto cover high mileagewith
simpleservicingand the minimum of maintenance.
For example,a special three-phase,electromagneticfield coil systemwill keep the battery
fully-chargedeven if the bike spendsthe whole
week running in "stop-go" traffic in short runs.
And a singlescrewwill synchronise
both Mikuni
constant-velocity
carburettors.
It's attentionto this kind of detail which makes
the XS400 so attractiveto motorcyclistwanting
the bestfrom both two-wheeledworlds-in traffic
or oul I
IRstrumentation
The Yamaha XS-series all have
full instrumentation -speedometer.
tachometer and warning lights for
gearbox neutral position and low
oil pressure.Unique Yamaha selfcancellingturn indicatorsare timed
to switch themselvesoff once the
rider has completed his turn !
Fingertip Switches
The essential control switches are
placed within a fingertip's reach
of the handlebar grips so that
their operation becomesvirtually
"second-nature" thinking on the
part of the rider. A great aid to
saferidins.
Transmission
The six-speed gearbox means that
the XS rider can always be in the
right gear at the right time. The
multi-plate clutch runs in oil and
is well up to the abusesof riding
in heavy traffic.
Wet Sump Lubrication
Engine and transmission oil is
contåined in a wet sumD at the
base of the engine crankcase.It is
then led under pressure into engine and gearbox.
Control Levers
The brake and clutch leverson the
XS models are of the "bell-crank"
variety. These give extra leverage
and so place less strain upon the
rider's hands, even after reDeated
use.
Cylinder Head
Valve operation is via a single
overhead camshaft driven by
a chain from the centre of the
crankshaft.
Pistons
The pistons of the twin-cylinder XS engine rise and fall
alternately, due to the "180
degree" opposite positioning
of the crankshaft bearing
journals. This makes for
smooth-rewing engine performance.
Starting System
For thosepeoplewho preferto be "old fashioned"a kick starter
is fined, but it is not really necessary
with the strongelectric
starterwhich quickly spinsthe engineinto life at the pushof a
button.
Cast Alloy Wheels and Disc Brake
Cast alloy wheelsare fitted as standard to the XS-seriesand contribute greatly to the clean, modern styting. Stronger. easier to
maintain and more eye-catchingthan the old spoked variety, they
are also dynamically-balancedfor smoother-running and better
tire wear. A big, powerful,267 mm disc brake is fitted to the front.
Forks and Suspension
Soft suspensiongives a comfortable ride but the triangulated,
cradle frame ensuresgood handling along with it. Rear shock
absorbershave five adjustmentsettingswhile the front forks have
140mm oftravel and a smooth action guaranteedby specialteflon
anti-friction bushes.
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xs400
SPECIFICATIONS
Type. i .
4-stroke, Twin, OHC
Displacement
391cm3
Bore& S rro ke .
. . . . . . 69. 0x 52. 4m m
C ompressionratio
. . . . 9. 2:l
M ax. horsep owe r..... .... 27. 9k W ( 38. 0HP) @ 8, 800r ev / m i n
Max. torque
. . . . .32.3 Nm (3.3kg-m) @8,000revlmin
Lubrication system.
wet sump
.... Pressure-fed
Startingsystem.
. .. .. . Electric& Kick starter
Primaryt r a nsmission
... Gear
F inal transmission
. . . . Cha i n
Gearbox
. . .. .. 6-speed
Carburettor.
Mikuni, BS34(X2)
C lut ch .
. . . . . . M ult i- plat e,we t
Battery.
. . lz V, 12AH
C hargingsyste m.
. . . . . 4. C. G ener ato r
l gnitiont y pe ..
. . . . . Bat t er y , CB/ Coil
YAMAHA MOTORN.V.
Postbus7829 PROF.E. M. Meyerslaan3
(Amsterdam),
Amstelveen
Holland
LIT-3MC-0107255-79BK.E/53.1Ox249OPrinted in Japan lt - F yzrl
DIMENSIONS
O v e r a l ll e n g t h
overan wiJttr..
Overallheight.
Wh e e l b a s e
Seatheight
Fuel tank capacity
Oil capacity
Tire front
rear...
Brakes front
rear....
.....2,080mm
z +s . .....1,065mm
..1,380mm
...780mm
. . . . l 7 . 0 l it.
....2.61it.
3.00S-18-4pR
. . . . . 3 . 7 5 S - 1 8 - 4 PR
. . . . Hyd. disc. 6267 mm
Drum
..::.:.::::::::::.:::......
* Specifcations subject to change without notice.
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