Jonsered CS 2145, CS 2141, CS 2150 manual Maintenance, Carburetor

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MAINTENANCE

Carburetor

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.

Functioning, Basic setting, Final setting

!WARNING! Do not start the saw without the bar, chain and clutch cover (chain brake) assembled. If you do, the clutch might come loose and cause severe injuries.

Operation

•The carburetor governs the engine speed via the throttle. Air/ fuel are mixed in the carburetor. The air/fuel mixture is adjustable. To take advantage of the engine’s optimal output the setting must be correct.

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

• The carburetor has three

L

H

adjustment possibilities:

 

 

T

 

 

L = Low speed jet.

 

 

H = High speed jet.

 

 

T = Adjustment screw for

 

 

idling.

H

 

•The fuel quantity required in relation to the air flow, provided by opening the throttle, is adjusted by the L and H-jets. If they are screwed clockwise the air/fuel ratio becomes leaner (less fuel) and if they are turned counter-clockwise the ratio becomes richer (more fuel). A leaner mixture gives a higher engine speed and a richer mixture give a lower engine speed.

•The T screw regulates the idling speed. If the screw T is turned clockwise this gives a higher idling speed; counter- clockwise a lower idling speed.

Basic setting and running in

The carburetor is set to its basic setting when test run at the factory. The basic setting should be kept during the machine‘s first working hours. Thereafter the carburetor should be finely adjusted. Fine adjustment should be carried out by a skilled technician.

NOTE! If the chain rotates while idling the T screw should be adjusted counter-clockwise until it stops.

Recommended idling speed: 2 700 rpm.

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

Fine adjustment

•When the saw has been ”run-in” the carburetor should be finely adjusted. The fine adjustment should be carried out by 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 carburetor while a dirty air filter is in use will result in a leaner mixture when the filter is finally cleaned. This can give rise to serious engine damage.

•Carefully turn the L needle to the mid point and H needle counter-clockwise against the stop.

•Do not attempt to adjust the needles beyond the stops as damage can occur.

•Now start the saw according to the starting instructions and run it warm for 10 minutes.

NOTE! If the chain rotates the T screw should be turned counter-clockwise until the chain stops.

•Place the saw 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 needle L

Turn the low speed needle L clockwise until the stop. If the engine has bad acceleration or erratic idling, turn the L needle counter-clockwise until good idling and acceleration.

NOTE! If the chain rotates in the idling position, turn the idling speed screw T counter-clockwise until the chain stops.

Final setting of the idling speed T

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

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

High speed needle H

 

 

 

 

 

 

 

 

 

The high speed needle H

 

 

 

 

 

 

 

 

 

influences the power of the saw.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A too lean adjusted high speed

 

 

 

 

 

 

 

 

 

needle H (high speed needle H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

turned 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-clockwise until the stop.

H

 

 

 

 

 

 

 

 

If the engine runs roughly, turn

 

 

 

 

 

 

 

 

 

the high speed needle slowly

 

 

 

 

 

 

 

 

 

the minimum amount clockwise

 

 

 

 

 

 

 

 

 

until the engine runs smoothly.

 

 

 

 

 

 

 

 

 

The high speed needle H is correctly set when the saw ”4-cycles” a little. If the saw ”whistles” the setting is too lean. If there is too much exhaust gas at the same time as the saw ”4-cycles” much, the setting is too rich. Turn the high speed needle H until the setting sounds correct. NOTE! For optimum setting of the carburetor, contact a qualified servicing dealer who has a revolution counter at his disposal.

Correctly adjusted carburetor

A correctly adjusted carburetor means that the saw accelerates without hesitation and the saw preferably 4-cycles a little at max speed. Furthermore, the chain must not rotate at idling. A too lean adjusted low speed needle L may cause starting difficulties and bad acceleration. A too lean adjusted high speed needle H gives lower power=less capacity, bad acceleration and/or damage to the engine. A too rich adjustment of the two speed needles L and H gives acceleration problems or too low working speed.

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Contents EPA Symbols KEY to SymbolsEPA ContentsPersonal Protective Equipment Safety Instructions3a Starting Chain brake and front hand guardRight hand guard Throttle lockChain catcher Muffler Stop switchVibration damping system Checking the front hand guard Checking brake band wearChecking the inertia brake release Checking the brake triggerThrottle lock 5 basic rules Cutting EquipmentBar Cutting equipment designed to minimise kickbackSaw chain Some terms that describe the bar and chainGeneral information on sharpening cutting teeth Sharpening your chain and adjusting raker clearanceSharpening cutting teeth Risk of kickback is increased with a badly sharpened chainTensioning the chain General advice on setting raker clearanceSetting the raker clearance Chain oil Lubricating cutting equipmentFilling with chain oil Never use waste oilChecking chain lubrication Needle bearing maintenanceChecking wear on cutting equipment Lubricating the bar tip sprocketWhat is kickback? HOW to Avoid KickbackNever use the saw one- handed General rulesDo not let go of the handles 10 ft Min mGeneral Working Instructions Basic safety rulesGeneral Basic cutting techniqueTerms CuttingSafe distance Tree felling techniqueLimbing Felling directionFelling Clearing the trunk and preparing your retreatFreeing a tree that has fallen badly = high accident risk General adviceCutting the trunk into logs Freeing a Trapped treeWhat is what? What is WHAT?Mounting guide bar and chain AssemblyFuelmix Fuel HandlingGasoline Two-stroke oilChain oil FuellingMin 3 m 10ftStart and stop Start and StopStart StopCarburetor MaintenanceStarter device Starter device assemblyChanging a broken or worn starter cord Tensioning the recoil springAir filter Needle bearing maintenanceMuffler Spark plugWinter use Adjustment of the oil pump Centrifugal cleaningCooling system Long-term storage Weekly maintenance Daily maintenanceMonthly maintenance Bar and chain combinations Technical DataRecommended original and replacement Your Warranty Rights Obligations Emission Control Warranty Statement2002W49 108 88

CS 2145, CS 2150, CS 2141 specifications

The Jonsered CS 2141, CS 2150, and CS 2145 chainsaws are renowned for their powerful performance and advanced technologies, making them the top choice for both professional loggers and enthusiastic DIYers. Each model shares a commitment to delivering reliability, efficiency, and precision in cutting, while still prioritizing user comfort and safety.

The CS 2141 model is designed with a robust 40.9 cc engine that provides strong power output while remaining lightweight, making it easy to maneuver. This chainsaw features a 15-inch guide bar, ideal for tackling small to medium-sized trees and clearing brush. The innovative fuel system ensures longer running times, reducing the frequency of refueling interruptions. A hallmark of this model is its Easy Start system, eliminating the hassle of hard starts to get you cutting quickly.

Moving up, the Jonsered CS 2150 boasts a slightly larger engine capacity of 50.2 cc, which translates to enhanced power, particularly useful for more demanding cutting tasks. This model is equipped with a 20-inch guide bar, allowing for efficient felling and limbing of larger trees. Its design incorporates the Air Injection air filtration system that separates debris from the air, extending the life of the air filter and reducing maintenance needs. The lightweight design coupled with anti-vibration technology makes operating this model comfortable, even during extended use.

The CS 2145 model is a versatile chainsaw that finds a perfect balance between power and weight. With a 45.7 cc engine, it provides excellent cutting performance for a range of applications. It features a 16-inch guide bar, making it adaptable for various tasks from pruning to more extensive logging work. Like its counterparts, the CS 2145 includes the Smart Start technology for effortless starting and an automatic oil pump to ensure a steady flow of lubrication to the chain, increasing the overall lifespan of the saw.

All three models utilize Jonsered's revolutionary X-Torq engine technology, which significantly reduces fuel consumption and emissions, underlining their commitment to environmentally friendly operation. Furthermore, each chainsaw is ergonomically designed, with focus on comfortable grip and controls that allow users to work with precision and ease.

In summary, the Jonsered CS 2141, CS 2150, and CS 2145 chainsaws combine cutting-edge technology with practical features that meet the needs of users in various cutting conditions. With powerful engines, advanced filtration systems, and user-friendly designs, these models set a high standard in the chainsaw market.
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