Suzuki GS500E (1989-1997) [31/221] Non scheduled maintenance

Suzuki GS500E (1989-1997) [31/221] Non scheduled maintenance
1-18 Non-scheduled maintenance
25.5 Remove the vacuum take-off C8p (arrow)
must be replaced. Note that in very ~ c-.
the fault could lie in the carburettors rather
than the cable, necessitating the removal of
the carburettors and inspection of the choke
valves (see ~.. 3).
Note: T1Je carbu,.uors will go out of
synchronlsation over 8 period of time,
resulting In decf88sed fuel mileage, Increased
engine temperature, less than Ideal throttle
response and higher vibration /e~.
.&. Werning: Petrol (ga.ollne) ,.
extremely flammable, .0 take
. extra precautions when you
worlc on any part of the fuel
system. Don't smoke or allow open frames
or bare light bulbs near the worlc area, and
don't worlc in a garage where a natural
gas-type appliance Is present. "you spill
any fuel on your skin, rinse it off
immediately with soap and water. When
you perform any kind of work on the fuel
system, wear safety glasses and have a fire
extinguisher suitable for a Class B type fire
(flammable liquids) on hand.
.&. Warning: Take great care not to
, burn your hand on the hot
. engine unff when accessing the
gauge take-off points on the
intake manifolds. Do not allow exhaust
gases to build up In the worlc .rea; either
perform the ChKk outside or use an
.m.ust gas utractlon system.
1 Carburettor synchronisation is simply the
process of adjusting the carburettors so they
pass the same amount of fueVair mixture to
each cytinder. This Is done by measuring the
vacuum produced In each cylinder. Before
25.8 Catb~or syndvonisatlon 8CNW (arrow)
8 The carburettors are adjusted by turning
the synchronlslng screw situated In-between
the carburettors, in the throttle linkage (see
illustr8tion). The screw Is accessed using a
long screwdriver. Turn the screw until the
reading on each gauge Is the same. Note: Do
not p~ down on the screw whilst adjusting
It, otherwise a false reading will be obtained.
When the carburettors are synchronlsed,
open and close the throttle quickly to settle
the linkage, and recheck the gauge reedings,
readjusting If necessary.
8 When the adjustment is ~ete, recheck
the vacwm readings, then adjust the idle
speed by turning the throttle atop screw until
the Idle speed listed In this Chapter'.
Specifications is obtained.
10 Stop the engine. Remove the gauge
hoses and replace the take-off caps. Detach
the temporary fuel supply Md install the fuel
tank (see Chapter 3).
synchrmslng the C8burettors, m8ce atn the
valve Cleerances are properly set.
2 To properly synchronlse the carburettors,
you win need some sort of v.:wm gauge set-
up with a gauge for each cylinder, or a
manometer, which is a calibrated tube
arrangement that utilises columns of mercury
or steel rods to indicate engine vacuum. If
using a m.-cury manometer, extra
precautions must be taken during use and
storage of the instrument as mercury Is a
liquid, and extremely toxic. Because of the
nature of the synchronlsation procedure and
the need for special Instruments, most 0WI'*8
leave the task to a Suzuki dealer.
3 Start the engine and let It run until It reaches
normal ~ng tempereture, then shut It off.
4 ~ the fuel tank (s. Chapter 3).
5 Remove the vacwm take-off cap from the
top of each carburettor (8.. IlIu8tratlon).
Connect the gauge hoses to the take-off
adapt«s. Make S(Q there .-e no air leaks as
false reedings will ~It.
8 Arrange a temporary fuel supply, either by
using a small temporary tank or by using extra
long fuel pipes to the now remote fuel tank.
Alternatively. poeitIon the tank on a suitable
base on the motorcycle, taking care not to
scratch any paintwork, and making sure that
the tank Is safely and securely supported.
7 Start the 8ngN 81d ~ the lcIe speed
to 1750 rpm using the throttle stop screw
under the right-hand carburettor (...
11IU8tr8t1on 8.3). If the gauges are fitted with
damping adjustment. set this so that the
needle flutter is just eliminated but 80 that
they can stili respond to small changes in
pressure. The vacuum readings for both of the
cylinders should be the same. If the vacuum
readings VaIY. proceed as follows.
Caution: Do not .llow th. engine to
overiIHt "n8C8a8ry, stop the engine end
allow It to cool b8foN starting 8g8/n.
Note: An improperly adjusted headlight may
cause problems for oncoming traffic or
provide poor, unsafe illumination of the road
afield. Sefora adjusting the hMcI#ght 8m, be
sure to consult with local trafflc laws and
regulations. For UK models, refer to 'MOT
Test Checks' in the Refetence section on this
Manual.
1 The headlight beam C8I be adjusted both
horIzontally ~ vertic81y. Check ftm that the
tyre preeaur88 are correct and the IUSpension
is adjusted as~ulred. The machine must be
off its stand 81d on level ground, with the fuel
tank half full and with an assistant sitt'ng on
the seat. If the bike Is usually ridden with a
passenger on the back, have a second
assistant to do this.

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