MAINTENANCE
Carburettor
Your Jonsered product has been designed and manufactured to specifications that reduce harmful exhaust fumes. The engine will be run in after it has used
Function, Basic settings, Fine adjustment
WARNING! Do not start the chain saw unless
!the bar, chain and clutch cover (chain brake) are fitted, otherwise the clutch may come loose and cause personal injury.
Function
•The carburettor governs the engine’s speed via the throttle control. Air and fuel are mixed in the carburettor. The air/fuel mixture is adjustable. Correct adjustment is essential to get the best performance from the machine.
•Adjusting the carburettor means that the engine is adapted to local operating conditions, e.g. climate, altitude, petrol and the type of
•The carburettor has three adjustment controls:
-L = Low speed jet
-H = High speed jet
-T = Idle adjustment screw
LH
T
•The L and
•The
WARNING! The catalytic converter muffler
!gets very hot during and after use. This also applies during idling. Be aware of the fire hazard, especially when working near flammable substances and/or vapours.
Basic settings and running in
The basic carburettor settings are adjusted during testing at the factory. The basic settings are H = 1 turn and L = 1 turn.
To provide the engine’s components with good initial lubrication (during running in) the carburettor should be set for a richer fuel mixture for the first
If you are unable to check the fast idle speed using a tachometer the
Fine adjustment
When the machine has been
| Max. fast idle speed, rpm | Idle speed, rpm |
CS 2147 | 14200 | 2700 |
CS 2152 | 13000 | 2700 |
Changing the type of fuel
Fine tuning may be required if the chain saw, after changing the type of fuel, performs differently with regard to starting, acceleration, max. speed, etc.
Conditions
•Before any adjustments are made the air filter should be clean and the cylinder cover fitted. Adjusting the carburettor while a dirty air filter is in use will result in a leaner mixture next time the filter is cleaned. This can give rise to serious engine damage.
•Carefully turn the L and
•Now start the machine according to the starting instructions and let it warm up for 10 minutes. CAUTION!
If the chain rotates while idling the
•Place the machine on a flat surface so that the bar points away from you and so that the bar and chain do not come into contact with the surface or other objects.
Low speed jet L
+ 1/4
L
Try to find the highest idle speed by turning the low speed jet L clockwise then
CAUTION! If the chain rotates while idling the
30 – English