Jonsered CS 2156 manual Maintenance, Carburettor

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MAINTENANCE

Carburettor

Your Jonsered product has been designed and manufactured to specifications that reduce harmful emissions.

After your unit has been run 8-10 tanks of fuel the engine has broken in. To ensure that your unit is at peak performance and producing the least amount of harmful emissions after break in, have your authorized servicing dealer, who has a revolution counter at his disposal, to adjust your carburetor for optimum operating conditions..

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.

•The setting of the carburetor means that the engine is adepted to local conditions, for example, the climate, altitude, fuel and the type of 2-stroke oil.

•The carburettor has three adjustment controls:

-L = Low speed jet

-H = High speed jet

-T = Idle adjustment screw

LH

T

•The L and H-jets are used to adjust the supply of fuel to match the rate that air is admitted, which is controlled with the throttle. If they are screwed clockwise the air/fuel ratio becomes leaner (less fuel) and if they are turned anti- clockwise the ratio becomes richer (more fuel). A lean mixture gives a higher engine speed and a rich mixture gives a lower engine speed.

•The T-screw regulates the throttle setting at idle speed. If the T-screw is turned clockwise this gives a higher idle speed; turning it anti-clockwise gives a lower idle speed.

Basic settings and running in

The carburettor is set to its basic setting when test run at the factory. The basic setting is richer than the optimum setting and should be maintained for the first hours that the machine is in use. The carburettor should then be finely adjusted. Fine adjustment should be carried out by a suitably trained person.

CAUTION! If the chain rotates while idling the T-screw must be turned anti-clockwise until the chain stops.

Rec. idle speed: 2700 rpm

WARNING! Contact your service agent, if the

!idle speed setting cannot be adjusted so that the chain stops. Do not use the chain saw until it has been properly adjusted or repaired.

Fine adjustment

When the machine has been ”run-in” the carburettor should be finely adjusted. The fine adjustment should be carried out by a qualified person. First adjust the L-jet, then the idling screw T and then the H-jet.

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 H needle to the mid point.

•Do not attempt to adjust the L and H jets beyond either stop as this could cause damage.

•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 T-screw must be turned anti-clockwise until the chain stops.

•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

Turn the low speed jet L clockwise until it stops. If the engine accelerates poorly or idles unevenly, turn the low speed jet L anticlockwise until good acceleration and idling are achieved.

CAUTION! If the chain rotates while idling the T-screw must be turned anti-clockwise until the chain stops.

Final setting of the idling speed T

Adjust the idle speed with the T-screw. If it is necessary to re- adjust, turn the T-screw clockwise while the engine is running, until the chain starts to rotate. Then turn counter-clockwise until the chain stops. A correctly adjusted idle speed setting occors when the engine runs smoothly in every position. It should also be good margin to the rpm when the chain starts to rotate.

WARNING! Contact your service agent, if the

!idle speed setting cannot be adjusted so that the chain stops. Do not use the chain saw until it has been properly adjusted or repaired.

High speed jet H

The high speed needle H influence the power of the machine. A too lean adjusted high speed (high speed needle H turn too much clockwise) gives overrevs and damages the engine. Do not allow the engine to run at full speed for more than 10 seconds. Turn the high speed needle H counter- clockwiseuntil the stop. If the engine runs roughly, turn the high speed needle slowly the minimum amount clockwise

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Contents EPA KEY to Symbols Key to symbolsContents EPA Safety Instructions Machine′s safety equipmentPersonal protective equipment Chain brake and front hand guard Chain catcher Stop switchThrottle lock Right hand guardMuffler Checking brake band wearChecking the front hand guard Throttle lock Checking the inertia brake releaseChecking the brake trigger Chain catcherGeneral rules Stop switchCutting equipment Vibration damping systemChain Cutting equipment designed to minimise kickbackBar Some terms that describe the bar and chainSharpening cutting teeth Sharpening your chain and adjusting raker clearanceGeneral information on sharpening cutting teeth With a badly sharpened chainTensioning the chain General advice on setting raker clearanceSetting the raker clearance If the raker clearance is too largeFilling with chain oil Lubricating cutting equipmentChain oil Checking chain lubricationNeedle bearing lubrication Checking wear on cutting equipmentChain drive sprocket How to avoid kickback What is kickback?Do not let go of the handles General safety precautions StartingGeneral working instructions Fuel safetyBasic safety rules Transport and storageBasic cutting technique GeneralTerms Cutting LimbingFelling direction Tree felling techniqueSafe distance Clearing the trunk and preparing your retreatFelling cut Cutting the trunk into logs General adviceFreeing a tree that has fallen badly Freeing a trapped treeWhat is WHAT? What is what on the chain saw?Assembly Fitting the bar and chainFuel Handling FuelFollowing applies to chain saws with catalytic converters Chain oil FuellingCold engine Starting and StoppingStarting and stopping Warm engineStopping Maintenance CarburettorChanging a broken or worn starter cord Correctly adjusted carburettorStarter Tensioning the recoil springMuffler Air filterSpark plug Fitting the starterWhen making adjustments Adjustment of the oil pumpCentrifugal cleaning Turbo Needle bearing lubricationHeated handles CS 2156W, CS 2159W Temperature 0 C 32 F or colderTemperature -5C 23 F or colder Electrical carburettor heating CS 2156WH, CS 2159WHDaily maintenance Weekly maintenance Monthly maintenanceBelow you will find some general maintenance instructions Technical Data Technical dataBar Length Pitch, inch Max nose Chain Inches Radius 050/1,3 mm 20BP063/1,6 mm 22BP Federal Emission Control Warranty Statement Your Warranty Rights and Obligations1088891-95
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