Adjusting The Idle - HUSABERG FE 450 Repair Manual

ADJUSTING THE CARBURETOR IDLE
The carburetor idle setting has a strong influence on the
engine's starting behavior. In other words, an engine with
a correctly adjusted idle will be easier to start than an
engine with an incorrectly adjusted idle.
The idle is adjusted via the adjusting knurl (1) and the
mixture control screw (2). The basic throttle slide position
is adjusted with the adjusting knurl. The mixture control
screw is used to adjust the idle mixture which flows
through the idle system to the engine. Turning in a
clockwise direction will reduce the amount of fuel (lean
mixture), turning in a counterclockwise direction will
increase the amount of fuel (rich mixture).
To adjust the idle, proceed as follows:
1 Turn the mixture control screw (2) in all the way to the
stop and adjust to the basic setting specified by
Husaberg (see Technical Specifications - Engine).
2 Run the engine warm
3 Use the adjusting knurl (1) to set a normal idle speed
(1400 - 1500/min).
4 Slowly turn the mixture control screw (2) in a clockwise
direction until the idle speed starts to drop.
G
Note down the position and slowly turn the mixture
12
control screw in a counterclockwise direction until the
idle speed drops again. Set the point between these
two positions that has the highest idle speed. If the
speed increase is too high, reduce the idle speed to a
normal level and repeat as described in section 4.
Racing pilots will make the ideal setting approx. 1/4
turn leaner (in a clockwise direction), since the engine
becomes hotter while racing.
NOTE: if the mode of procedure described
above does not achieve satisfactory results, this
may be due to the wrong dimensioning of the
idling jet. If
a) the mixture control screw is turned in up to the stop
without any change in the speed, mount a smaller
idling jet.
b) the engine stalls with the mixture control screw 2
turns open, select a larger idling jet.
Repeat the adjustment procedure after replacing the
jet.
5 Now set the desired idle speed with the adjusting
knurl.
6 Readjust the idle for greater changes in the outdoor
temperature or extremely varying altitudes.
FUEL SYSTEM
1
2