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8 DIAGNOSIS
8.1 The engine does not start
6
Check if the fuel is not reaching the carburetor
because:
-
The tank is low on fuel: place fuel tap in
reserve position (lever pointing up) and
then refuel;
-
The fuel tap is closed;
-
The fuel line is clogged (by an air bubble,
for instance);
-
The carburetor or air filter is dirty.
6
Check the ignition:
-
With the spark plug removed and resting
with its metal portion lying on the fins of
the cylinder, check whether there is a
spark between the electrodes by
depressing the kick starter manually.
-
Check whether the spark plug is dirty (in
this case clean it thoroughly) and check
whether the gap of the electrodes is
correct (0.3 0.4 mm );
-
Check the spark plug cable and replace
if it is broken or poorly insulated;
-
Check the electric wiring (see diagram
fig. 22). Make sure that the ground
connection between the engine and the
frame is efficient.
÷
8.2 The engine does not run normally
The reason can be:
6
One of the reasons listed in sec. 8.1
6
Carbon deposit at the piston and cylinder
head, at the cylinder exhaust port, in the
exhaust pipe;
6
The spark plug or the cylinder head or the
induction manifold are not tightened.
8.3 Fouling at the electrodes
The reason can be a too poor carburation:
6
Clean the carburetor, the cylinder exhaust
port, the exhaust pipe;
6
Tighten the spark plug,the cylinder head, the
induction manifold;
6
Make sure that fuel is a mixture of regular
fuel with 2% oil.
8.4 Jamming of the expanding pulley
Disassemble and clean.
8.5 Jamming of the reduction unit
Replace the V-belt.