32
Series 4137 Components - HT
The carburetor’s throttle lever must
butt against the stop on the
carburetor cover when the throttle
trigger is fully depressed (full
throttle) and against the idle speed
screw (
LA
) (only with control handle
from 2002) when the throttle trigger
is released (idle position).
Adjustments are carried out on the
tensioner.
– Remove the shroud,
Version with Control Handle
up to 2002 only
– To adjust, squeeze the throttle
trigger as far as stop (full throttle
position).
:
Turn the adjusting screw (1)
VA
932RA314
2
3
1
4
clockwise until the throttle lever
(2) butts against the stop (3) on
the carburetor cover.
:
Release the throttle trigger (idle
position). The throttle lever must
butt against the idle speed screw
(4).
Version with Control Handle
from 2002 only
:
Check adjustment range of the
idle speed screw. Before starting
the adjustment, center the
adjusting screw (1) as shown.
VA
936RA377
1
– Install the shroud,
Dirty air filters reduce engine power,
increase fuel consumption and
make starting more difficult. The air
filter must be cleaned if there is a
noticeable loss of engine power.
– Close the choke shutter.
– Remove all loose dirt from
around the filter housing.
:
Push back the tab on the filter
housing.
:
Pull of the filter cover.
VA
936RA156
:
Remove the foam element (1)
and felt element (2).
VA
936RA157
1
2
8.4
Adjusting the Throttle
Cable
9.
Fuel System
9.1
Air Filter