Jonsered 2095 Workshop Manual

49
4
1–1 1/4
1–1 1/4
Fuel system
!
Fit the metering diaphragm. Place the gasket on the carburettor
housing followed by the metering dia-
phragm.
Check that the air hole in the cover is
open and screw tight the cover.
Carburettor setting
WARNING!
When test running the engine in connection with adjusting the carburettor, the
clutch and clutch cover must without exception be fitted.
Otherwise there is a risk that the clutch can come loose and cause serious
personal injury.
Function
The purpose of the carburettor is to deliver a combustible mixture of air and fuel to the
cylinder.
The quantity of this mixture is regulated with the throttle control.
The composition of the mixture of petrol and air is regulated by means of the adjustable
nozzles ”H” and ”L”.
In order for the engine to provide maximum power at different speeds, run smoothly at
idling speed and respond quickly to the throttle, it is necessary for the nozzles to be
correctly adjusted.
The adjustment of the carburettor can vary somewhat depending on humidity, tempera-
ture and air pressure.
L = Low speed nozzle
H = High speed nozzle
T = Adjuster screw for idling speed
● With the L- and H-nozzles the required fuel quantity is adjusted to the air flow which
the opening of the throttle control permits. If they are screwed clockwise the air/fuel
mixture becomes lean (less fuel), and if they are screwed anti-clockwise the air/fuel
mixture will be rich (more fuel). A
lean mixture gives higher speed and a rich mixture
gives
lower speed.
● The T-screw regulates the throttle control’s position at idling speed. If the T-screw
is screwed clockwise a higher idling speed is obtained, and if it is screwed anti-
clockwise a lower idling speed is obtained.
Basic setting
The carburettor is given a basic setting during test running at the factory. The basic
setting is ”richer” than the optimum setting (the overspeed lies at 600-800 rpm below
the recommended max. overspeed) and should be retained during the first hours the
engine is in operation. After this the carburettor should be fine adjusted. The basic
setting can vary between:
H = 1 to 1 1/4 turn.
L = 1 to 1 1/4 turn.
Fine adjustment
When the engine is ”run in” the carburettor should be adjusted.
● During all adjustments the air filter should be clean and the cylinder cover fitted.
The L-nozzle is adjusted first, followed by the H-nozzle and finally the idling screw T.

Jonsered 2095 Specifications

General

Brand	Jonsered
Model	2095
Category	Chainsaw
Language	English