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Routine maintenance and servicing procedures
1.31
14.2 Fuel tap union clip (A), fuel hose
(6) a
present. If you spill any fuel on your skin,
rinse it o f f immediately with soap a n d
water. When you perfonn any kind o f work
on the fuel system, wear safety glasses and
have a fire extinguisher suitable for a Class
B
type
fire (flammable liquids) on hand.
1 Remove the body panels as necessary to
access the fuel tank, tap and carburettor (see
Chapter 7). Check the fuel tank, the tap and
the fuel
hose for
signs of
leakage,
deterioration or damage; in particular check
that there is no leakage from the fuel hose.
Replace the fuel hose if it is cracked or
deteriorated.
2 lnspect the fuel tap to tank union and
ensure that the hose clip around the union is
tight (see illustration). If the union is leaking,
remove the tank and check the condition of
the fuel tap O-ring (see Chapter 4).
3 The fuel tap is vacuum operated and should
be closed when the engine is not running.
Disconnect the hose from the tap to check
that the valve inside is not leaking (see
illustration 14.2). If the valve is leaking, fit a
new tap (see Chapter 4).
4 Cleaning or replacement of the fuel filter is
advised after a particularly high mileage has
been covered or if fuel starvation is suspected
(see Chapter 4).
5 Check that the fuel tank cap breather hole
is clear. If the hole becomes blocked, fuel
starvation will occur.
15.4b
. . .
and on the Trekker and Vivacity
~ n d vacuum hose (C)
15.4a Adjusting the idle speed screw on the Speedfight.
. .
6 If the carburettor gaskets are leaking, the
recheck the throttle cable freeplay (see
carburettor should be disassembled and rebuilt
Section 10).
using new gaskets and seals (see Chapter 4).
7 If the fuel gauge is believed to be faulty,
check the operation of the sender (see
Carburettor-
Chapter 9).
cleaning
15 Idle speed
-
check and adjustment
Q
P
1 The idle speed (engine running with the
throttle twistgrip closed) should be checked
and adjusted when it is obviously too high or
too low. Before adjusting the idle speed, make
sure the throttle cable is correctly adjusted
(see Section 10) and check the spark plug gap
(see Section 17).
2 The engine should be at normal operating
temperature, which is usually reached after 10
to 15 minutes of stop-and-go riding. Place the
machine on its stand and make sure the rear
wheel is clear of the ground.
A
Warning: Do n o t allow exhaust
gases to build up in the work area;
either perform the check outside
or use an exhaust gas extraction system
3 No tachometer is fitted as standard equip-
ment to enable the idle speed to be compared
with that specified. However, it is sufficient to
ensure that at idle the engine speed is steady
and does not falter, and that it is not so high
that the automatic transmission engages.
4 The idle speed adjuster screw is located on
the carburettor (see illustrations). With the
engine running, turn the screw clockwise to
increase idle speed, and anti-clockwise to
decrease it.
5 Snap the throttle open and shut a few
times, then recheck the idle speed. If
necessary, repeat the adjustment procedure.
6 If a smooth, steady idle can't be achieved,
the fuellair mixture may be incorrect (see
Chapter 4) or the carburettor may need
cleaning (see Section 16)
7 With the idle speed correctly adjusted,
1 Provided the air filter element is kept clean
(see Section 1) the carburettor will give many
thousands of miles of satisfactory service.
However, dirt particles and varnish which
gradually accumulate inside the carburettor
will eventually lead to running problems and
necessitate that the carburettor be removed
as described in Chapter 4, Section 9, then
dismantled and cleaned as described in
Section 10 of the same Chapter. Note that a
new carburettor gasket set will be required if it
is to be dismantled.
2 Note that the exterior of the carburettor
should be kept clean and free of road dirt.
Remove the air filter housing cover and the air
intake duct (see Chapter 4) for access.
17 Spark plug
-
gap check and adjustment
&
h . .
1 Make sure your spark plug socket is the
correct size (14 mm) before attempting to
remove the plug. Open the engine access
panel in the bottom of the storage compart-
ment and pull off the spark plug cap (see
illustrations).
2 Ensure the spark plug socket is located
correctly over the plug and unscrew the plug
from the cylinder head.
3 lnspect the electrodes for wear. Both the
centre and side electrode should have square
edges and the side electrode should be of
uniform thickness.
Look for excessive
deposits and evidence of a cracked or
chipped insulator around the centre electrode.
Compare your spark plug to the colour spark
plug reading chart at the end of this manual.
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