GGP Mountfield SV-150, Workshop Manual, Page: 24 / 35

6.5 GOVERNOR SYSTEM OF THE CARBURET-
TOR
GENERAL INFORMATION
The carburettor’s governor system consists of a
lever system mounted on a support attached to the
engine’s cylinder head, with a built-in pneumatic
device.
This device consists of a fin disc which tends to
close the carburettor’s choke under the pressure of
the flywheel air, against the main spring of the con-
trol lever. The balance between the throttle control
and the push of air on the fin disc adapts the flow of
mixture into the engine depending on the power
required.
The governor system can malfunction in the follow-
ing ways:
• difficult or failed start or insufficient power (if not
due to other causes):
= Incorrect adjustment of the throttle cable
[
6.5.A] ;
= rods bent or deformed [ 6.5.B] ;
= pneumatic device broken or blocked [
6.5.B] .
• Engine runs irregularly (if not due to other caus-
es):
= pneumatic device broken or blocked
[
6.5.B] .
A visual inspection allows you to rapidly identify any
broken or deformed parts, which should always be
replaced.
SERVICING PROCEDURES
A) Adjusting the throttle cable
1 Loosen the screw (1) of the clamp (2) so that the
cable sheath (3) runs freely.
2 Set the throttle control lever to “SLOW”.
3 Push the speed governor lever forward as far as
reaching the end of stroke (4), keep it in this
position and secure the cable sheath (3) by
tightening the screw (1) of the clamp (2).
SLOW
CHOKE
FAST
SV 150
6.5 .
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GOVERNOR SYSTEM OF THE CARBURETTOR
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