SV200 R200
4/2007© by GLOBAL GARDEN PRODUCTS
Intake problems
Air filter is clogged up
Carburation problems
Carburettor dirty
Poor seal of carburettor needle
valve
Choke blocked
Lawnmower problems
The lawnmower traction cable
(if present) is bent, jammed or
poorly adjusted
Engine block problems
Oil in the cylinder head
Pressure reducer fault
The clogged filter can thicken the mixture flood-
ing the engine
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 pressure reducer is a device with counter-
weights whose task is to keep the exhaust valve
slightly open when starting to reduce compres-
sion and make starting easier. If this does not
happen, starting will require greater force being
applied to the rope to overcome the increased
compression.
Check and clean the
air filter [
6.3.A
]
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]
Check the pressure
reducer and couter-
weights [
6.10.B
]
5.1.1
TROUBLESHOOTING
3 / 7
SERVICE MANUAL
page
from
2007 to ••••
C) Starting is difficult and strains the rope
Probable cause Comment Solution
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