GGP Mountfield SV-150, Руководство по ремонту, Страница: 10 / 35

Carburation problems
Carburettor is dirty
Poor seal of carburettor needle
valve
Choke blocked
Lawnmower problems
The lawnmower traction cable
(if present) is bent, jammed or
poorly adjusted
Problems caused by the
engine
Oil in the cylinder head
Supply problems
The tank cap has a clogged
breather pipe
If the jet and the pipes inside the carburettor clog
up, the petrol flow drops and the engine fails to
function correctly.
If the needle valve does not close, excess fuel in
the float chamber can reach the combustion
chamber through the intake manifold. This can
flood the engine and be hazardous as the petrol
can seep through the rings and reach the oil
sump. When mixed with petrol, oil loses its lubri-
cating properties and the engine deteriorates
rapidly.
The choke can get blocked in the closed posi-
tion if the mixture is too oily.
The engine must start with the lawnmower drive
completely disengaged; a poorly adjusted cable
can generate faulty resistance which makes
starting more difficult.
If the engine is tilted with the spark plug at the
bottom, oil may seep into the cylinder head
through the rings. This causes excess pressure
and a reduction of mixture in the combustion
chamber.
The clogged breather pipe in the tank stops the
regular flow of fuel into the carburettor float
chamber. When the fuel has run out in the float
Check and clean the
carburettor
[ 6.4.A]
Clean the carburettor
housing and needle
valve
[ 6.4.A] or
replace the carburettor
[ 6.4.B]
Check and clean the
carburettor
[ 6.4.A]
and the choke
Check and/or adjust
the lawnmower trac-
tion cable
Dismount the cylinder
head and clean it
[
6.9.A]
Clean and/or replace
the cap
[ 6.1.C]
01/2005
SV 150
5.1 .
0
TROUBLESHOOTING
2 / 5
WORKSHOP MANUAL
page
from
2004
to
••••
C) Starting is difficult and strains the cable
Probable cause Comment Solution
D) The engine starts but does not run
Probable cause Comment Solution
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