Oil pump capacity at 9,000 rpm, ml/min 5 - / 9 / 5-- - - - 17
Oil tank capacity Litres/US pints 0,28 / 0,59 0,25 / 0,53 0,28 / 0,59 0,28 / 0,59 0,38 / 0,80 0,38/ 0,80

Automatic oil pump

Yes Yes Yes Yes Yes Yes
Weight without bar and chain kg / lbs CS 2149: 4,9 / 10,8 CS 2149 W: 5,0 / 11,0 CS 2141/CS 2145/ CS 2150: 4,9 / 10,8 CS 2147/C: 5,0 / 11,0 CS 2147 WH/CWH: 5,1 / 11,2 CS 2152/C: 5,0 / 11,0 CS 2152 W/WH/ CW/CWH: 5,1 / 11,2 CS 2156/W/H: 5,6 / 12,4 CS 2156 C/CWH: 5,7 / 12,6 CS 2159/C: 5,6 / 12,4 CS 2159 W/H: 5,7 / 12,6
Weight with bar and chain kg / lbs 5,7 / 12,4 5,8 / 12,4 5,7 / 12,4 5,8 / 12,6 5,9 / 13,0 5,8 / 12,6 5,9 / 13,0 6,4 / 14,1 6,5 / 14,3 6,4 / 14,1 6,5 / 14,3
Heated hand grips Yes Yes Yes Yes Yes Yes Yes

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Carburettor
The carburettor consists of three sub-systems: The carburettor works in different ways depending on the setting: Cold start mode Idling mode Part throttle mode Full throttle mode
The metering unit (A) which contains the jets and the fuel control mechanism. This measures out the right amount of fuel to suit the speed of the saw and the power demand.
The mixing unit (B) consists of the choke, diffuser jets and throttle valve. This is where the air and fuel are mixed to create a ammable mixture.
In the cold start mode the choke valve (D) is completely closed. This increases the vacuum in the carburettor so that fuel is sucked through the diffuser jets faster (E).
The pump unit (C) pumps fuel from the tank to the metering system inside the carburettor. One side of the pump diaphragm is connected to the crankcase and pulses as a result of pressure changes in the crankcase. The other side of the diaphragm sucks in the fuel.
In idling mode the throttle valve (F) is closed. Air is sucked through an aperture in the throttle valve and a small amount of fuel is supplied through the diffuser jet (E).

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In part throttle mode the throttle valve (F) is partially open. Fuel is supplied through the diffuser jets (E).
In full throttle mode both valves are open and fuel is supplied through all the diffuser jets (E).

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The various faults that can affect a chainsaw are divided into four groups. In each group the likely symptoms are given on the left and possible causes are listed on the right. The most likely faults are given rst, and so on. Starting Difculty starting Adjust L screw Air lter blocked Choke not working Worn choke pivot Worn choke valve Fuel lter blocked Fuel line blocked Piston ring seized Blocked impulse channel Loose or faulty fuel pipe Hole in diaphragm Worn needle valve Needle valve assembly sticking Needle valve set too high Leak in metering system (air or fuel) Loose cover on carburettor pump side Worn needle valve Needle valve set too high Needle valve assembly sticking Idling (low rpm) (cont.) Idles when L screw closed Worn needle valve Leaking control diaphragm/ cover plate Needle valve assembly sticking Worn needle valve lever Faulty diffuser jet Fuel lter blocked Fuel line blocked Leaking air intake hose (rubber) Loose carburettor mounting bolts Worn throttle valve pivot Loose throttle valve screw Worn throttle valve Needle valve assembly sticking Leak in metering system (air or fuel) Metering system centre knob is worn Hole in diaphragm Leaking control diaphragm/ cover plate Crankcase leaking Fuel line blocked Needle valve set too high Needle valve assembly sticking Leak in metering system (air or fuel) Leaking control diaphragm/ cover plate Faulty diffuser jets Crankcase leaking Needle valve set too high Needle valve assembly sticking Metering system damaged Worn needle valve Leaking control diaphragm/ cover plate Metering system incorrectly assembled

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Stop switch retting

Choke control removal

1 Remove the cylinder cover, air lter and stop switch. Disconnect the fuel hose from the carburettor. NOTE! Do not use knurled pliers to disconnect or reconnect the fuel hose. This could damage the hose and lead to leakage or fracture.
2 Carefully press the new stop switch into place. Check that the switchs upper mounting clips over the air lter holder. 2
Disconnect the pushrod from the carburettor by rst carefully prising up the spring over the end of the rod, where it connects to the throttle lever (A). Then press the throttle lever forwards (B) while pressing the throttle pushrod backwards (C) and lifting it off the lever. Withdraw the throttle pushrod from the tank and lift it upwards without pulling it through the rubber inlet manifold. Carefully release the carburettor assembly from the right-hand rubber mounting and lift it upwards. Ret the stop plate. Engage the stop plate in the front slot rst then lift the rear edge onto the stop switch. Slide the stop plate in as far as it will go. 3 Ret: the leads to the stop plate and stop switch air lter cylinder 3
Compress the clip that holds the choke control to the carburettor while pulling it out at the same time. Disconnect the choke control from the air lter holder.

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Choke control retting
First reattach the choke control to the air lter, then press it onto the carburettor so that the clips engage. Then ret: stop switch carburettor into its rubber mountings throttle pushrod into the fuel tank and connect to throttle lever. lift the spring arm over the throttle pushrod fuel hose to the carburettor air lter and cylinder cover
Clean and inspect all parts carefully. If there are any cracks or other defects replace the damaged parts with new ones. Always use original parts. Lubricate the throttle lock with oil. Check that the spring is not broken and has not lost its tension.
Throttle lock, throttle trigger and return spring retting
Throttle lock, throttle trigger and return spring removal
Ret the return spring to the throttle trigger as shown. Make sure the spring is correctly positioned by engaging one end in the slot in the throttle trigger (A). 2 First insert the rear edge of the throttle trigger into the tank. Then push/clip the front edge into the two clips on the tank with the aid of a combination tool, for example. Drive in the steel pin from the clutch side. Use a 2.5 mm/0.1" diameter drift.
Remove the throttle lock by pressing it to the left (A) and carefully levering it up with a screwdriver on the clutch side (B) of the saw to disengage the lugs on either side of the throttle lock from the fuel tank. When both lugs are clear of the tank, pull the lock backwards (C). 2

Drive out the steel pin using a 2.5 mm/0.1" diameter drift (A). Push it out from the ywheel side of the saw. Remove the throttle trigger by rst pressing it towards the clutch side of the saw (B) until it clicks, then towards the ywheel side until it clicks again. Remove it from the tank and lift out the return spring.
3 Then press down the return spring while pressing the throttle lock forwards/upwards into the retaining clip in the fuel tank until you hear a click. Release the return spring in the throttle lock, then press the lock down onto the tank. 4 Check the operation of the throttle lock by trying to press the throttle trigger without pressing down the throttle lock. Also check that the throttle lock and throttle trigger return freely to their original positions when released.

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Hand grip heater on model CS 2147 W, CS 2149 W, CS 2152 W, CS 2156 W, CS 2159 W removal
No heating or heating only in front hand grip Front hand grip troubleshooting 1
2 Reconnect the lead and ret the hand grip cover and cylinder cover. Switch troubleshooting 1 Carefully free the switch and frame from the front hand grip using a screwdriver. 2 Disconnect the leads from the switch and connect a multimeter to it. The meter should read over 1000 ohm when the switch is in the 0 position. The meter should read no higher than 0.1 ohm with the switch in the 1 position. Replace the meter if the readings are outside these limits. Rear hand grip heater not working Rear hand grip heater troubleshooting 1 Remove the cylinder cover, air lter and cover from the rear hand grip.
Remove the three bolts that secure the cover over the front hand grip. Disconnect the leads from the switch and generator and measure the resistance of the hand grip heater, which should be 34 ohm. Replace the front hand grip if the resistance is higher. 2
2 Disconnect the red lead from the heater and connect a multimeter between it and the black earth lead that is bolted to the bottom of the carburettor on the clutch side of the saw. The meter should read 0.71.2 ohm. If the reading is higher replace the heater element. 3 Remove the air lter, throttle pushrod, rubber diaphragm and carburettor, see Carburettor removal. 4 Remove the bolt from the plate at the base of the carburettor to release the lead for the heater element. 5
Reconnect the leads and ret the cover. 3 Push the switch back into place and reconnect the leads. 4 Bolt the cover back onto the hand grip. Generator troubleshooting 1 Remove the cylinder cover and cover from the front hand grip. Disconnect the black lead from the generator and connect a multimeter between it and a clean area on the cylinder. The multimeter should show a resistance of 0.91.3 ohm. If the reading is higher or lower, replace the generator, see Replacing the generator. 20 English
Unscrew the three bolts from the front hand grip and remove the cover to reveal the leads. Disconnect the red lead.

Loosen the ywheel nut using a suitable socket and unscrew it until it is ush with the end of the shaft.

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Repair instructions 4
Replacing the generator, model CS 2147 W, CS 2149 W, CS 2152 W, CS 2156 W, CS 2159 W
1 Remove the cylinder cover. Disconnect the HT lead, remove the spark plug and t piston stop 15-01 in its place. Take off the starter assembly, release the leads from the cable guide and remove it. Remove the cover from the hand grip. 2
Position puller 90-02 over the magnets and counterweight on the ywheel. Tighten 23 turns and tap the head of the puller with a metal mallet to release the ywheel. Remove the puller, nut and washer. Lift off the ywheel.
Clean all parts, especially the tapers on the ywheel and shaft. Check that the ywheel is not cracked or damaged in any other way. Loosen the ywheel nut using a suitable socket and unscrew it until it is ush with the end of the shaft. Position puller 90-02 over the magnets and counterweight on the ywheel. Tighten 23 turns and tap the head of the puller with a metal mallet to release the ywheel. Remove the puller, nut and washer. Lift off the ywheel. 3
Unscrew the two bolts from the generator but leave the generator in place.

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Repair instructions 4 Remove the fuel hose and throttle pushrod from the carburettor. Unbolt the rear tank mounting from the crankcase, i.e. the rear vibration damping spring, and both stops. Lower the tank as far as it will go to allow access to the heater lead where it is connected to the tank. 5 Disconnect the generator lead from the hand grip and unclip it from the tank. Remove the generator and lead.
Ignition module and ywheel retting

Generator retting

1 Feed the generator lead through the holes in the crankcase and hand grip. Bolt the generator in position, tightening the bolts to a torque of 5 Nm. Clip the lead to the tank. NOTE! The lead connector must be positioned on the right of the clip, see diagram. Connect the lead to the connector on the hand grip. 2 Ret: fuel tank with both stops and rear vibration damping spring fuel hose to carburettor, hose length between tank and crankcase: 43 mm/1.69 inches and between crankcase and carburettor: 53 mm/2.09 inches throttle pushrod to carburettor ywheel with nut and washer cable guide, leads and starter assembly Remove the piston stop and reconnect the HT lead and cylinder cover. To ret the ignition module proceed as follows: Turn the ywheel so that the magnets are in line with the ignition module. Fit the ignition module with the plastic feeler gauge (34-01) held in position at the same time, without tightening the bolts. Connect the black earth lead to the front screw on the ignition module. Adjust the gap between the ignition module and magnet to 0.3 +/- 0.1 mm. The gap must be measured at either of the two lowest pegs on the ignition module. Tighten the bolts to 4.56 Nm. Connect the blue lead to the ignition module. Place the ywheel on the crankshaft. Turn the ywheel so that the key lines up with the keyway in the shaft. Fit the washer and nut on the shaft and tighten to a torque of 25-30 Nm. 2

0,3 mm

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Repair instructions 3

Centrifugal clutch removal
1 Remove the cylinder cover. Disengage the chain brake by pushing the kickback guard backwards. Undo the guide bar bolts and remove the clutch cover, chain and guide bar. 2
Then ret: cable guide and press the leads into position HT lead starter assembly, tighten to a torque of 2.53.5 Nm cylinder cover Disconnect the HT lead. Remove the spark plug and t piston stop 15-01 in its place. 3 Models CS 2141, CS 2145, CS 2147, CS 2149, CS 2150, CS 2152
Unbolt the clutch using tool 16-02 and a suitable socket or combination spanner. Turn the nut clockwise to remove it. Model CS 2156, CS 2159
Use clutch tool 22-English
Repair instructions 4 Models CS 2141, CS 2145, CS 2147, CS 2149, CS 2150, CS 2152 NOTE! Handle the clutch springs carefully. If they are opened up too much they could damage the saw. Model CS 2156, CS 2159

Min 65 mm

Centrifugal clutch retting
1 Model CS 2141, CS 2145, CS 2147, CS 2149, CS 2150, CS 2152 NOTE! Handle the clutch springs carefully. If they are opened up too much they could damage the saw.
Carefully prise out the clutch springs with a screwdriver. Model CS 2156, CS 2159

Inspection and cleaning

Clean and inspect all parts carefully. If there are any cracks or other defects replace the damaged parts with new ones. Always use original parts. Models CS 2141, CS 2145, CS 2147, CS 2149, CS 2150, CS 2152 Insert the clutch springs in the shoes using circlip pliers. Model CS 2156, CS 2159

Min 65mm

Check the thickness of the clutch shoes by using vernier callipers to measure the diameter of the clutch. If the diameter is less than 65 mm the clutch assembly must be replaced. Fit the clutch springs in the shoes using circlip pliers and a screwdriver.

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Repair instructions 2 Models CS 2141, CS 2145, CS 2147, CS 2149, CS 2150, CS 2152
Oil pump removal CS 2147, CS 2149, CS 2150, CS 2152, CS 2156, CS 2159
1 Empty and clean the oil tank. 2
Fit the clutch onto the crankshaft and tighten anticlockwise as far as it will go. Then tighten to a torque of at least 20 Nm using tool 16-02 and a suitable socket or combination spanner. Model CS 2156, CS 2159

Remove the cylinder cover. Disengage the chain brake by pushing the kickback guard backwards. Undo the guide bar bolts and remove the clutch cover, chain and guide bar. Disconnect the HT lead. Remove the spark plug and t piston stop 15-01 in its place. Unscrew the clutch (clockwise) using clutch tool 16-02 and a suitable socket spanner or combination spanner (use tool 22-02 for model CS 2159). 3 Models CS 2141, CS 2145, CS 2147, CS 2149, CS 2150, CS 2152

D C B A

Fit the clutch and tighten anticlockwise as far as it will go. Then tighten to a torque of at least 20 Nm using tool 22-02. 3 Remove the piston stop. Fit the spark plug, tightening it to a torque of 15 Nm, then connect the HT lead. Then ret: cylinder cover guide bar chain clutch cover Unbolt and remove the clutch drum (A), RIM chain sprocket (B) if tted, needle bearing (C) and pump drive wheel (D).

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Remove the oil hose and lter (A). Model CS 2159 has two oil hoses. Model CS 2150: Push the housing up a little from the fuel tank and remove the lter (A) from underneath, see the diagram under Oil pump removal CS 2141, CS 2145. 7 Remove the pin (B) from the adjuster screw, using a small drift to press it out. 8 Press in the pump piston (C) so that the adjuster screw (D) can be removed. Remove the pump piston.
Loosen the chain guide plate, one or two bolts depending on the model. Model CS 2150: Remove the bolts on the anti-vibration elements on the same side. 5
Oil pump removal CS 2141, CS 2145
1-4 See Oil pump removal, models CS 2147, CS 2149, CS 2150, CS 2156, CS 2159points 1-4. Remove the bolts on the anti-vibration elements on the same side. 5
Unbolt the oil pump from the crankcase.
Carefully lift out the oil pump from the crankcase.

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Repair instructions 6
Oil pump retting CS 2147, CS 2149, CS 2150, CS 2152, CS 2156, CS 2159
Push the crankcase up a little from the fuel tank and remove the lter (A) from underneath. Lubricate the pump piston (C) with chain oil and t the pump piston and washers. 2 Press down the pump piston (C). Fit the adjuster screw and spring so that the pin (B) can be pressed into position. 3 Reconnect the oil hose and lter (A). Model CS 2150: Push the crankcase up a little from the fuel tank and screw on the lter (A) from underneath. WARNING! Poor chain lubrication can result in failure of the chain, which could cause serious or fatal injury. 4
Clean and inspect all parts carefully. If there are any cracks or other defects replace the damaged parts with new ones. Always use original parts. Lubricate all moving parts with chain oil.

Bolt the oil pump to the crankcase. The adjustable oil pump must be bolted to torque of 23 Nm.

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Repair instructions 5 Lubricate the needle bearing with grease. Fit the pump drive wheel (D), needle bearing (C), chain sprocket (B), if tted, and clutch drum (A). 7 Fit the clutch onto the crankshaft and tighten anticlockwise as far as it will go. Then tighten to a torque of at least 20 Nm using tool 16-02 and a suitable socket spanner or combination spanner (use clutch tool 22-02 for model CS 2159). 8 Remove the piston stop. Fit the spark plug, tightening it to a torque of 15 Nm, then connect the HT lead. Then ret the cylinder cover, guide bar, chain and clutch cover. Fit the chain guard plate, tightening the bolts to a torque of 23 Nm. Model CS 2150: Fit the bolts on the anti-vibration elements on the same side. 6 Models CS 2141, CS 2145, CS 2147, CS 2149, CS 2150, CS 2152
9 Rell the tank with oil. For more information see the user instructions for this model for the recommended grade of oil.
Oil pump retting CS 2141, CS 2145
Lubricate the piston pump (C) with chain oil and t the pump piston. 2 Fit the pump. A round pin secures its position. Model CS 2156, CS 2159
Push the crankcase up a little from the fuel tank and screw on the lter (A) from underneath.

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Repair instructions 3 Fit the chain guide plate (one bolt), tightening torque 2-3 Nm. NOTE! Check that the chain tensioner is in position. Fit the bolts on the anti-vibration elements. Note. Models CS 2145 and CS 2150 have another type of chain tensioner, which is adjusted from the side. 4 See Oil pump Retting, models CS 2147, CS 2149, CS 2150, CS 2156, CS 2159 pos. 6-9.

Carburettor removal

Adjustable oil pump adjustment CS 2147, CS 2149, CS 2150, CS 2152, CS 2156, CS 2159
Use a screwdriver or adjustable spanner to turn the adjuster screw on the pump. Turning the screw clockwise decreases the oil ow and turning it anticlockwise increases the oil ow. NOTE! Do not use knurled pliers to disconnect or reconnect the fuel hose. This could damage the hose and lead to leakage or fracture. Remove the cylinder and air lter. Disconnect the leads from the stop switch and the fuel hose from the carburettor. 2
Recommended setting: 1315" bar Min. setting 1518" bar Midway setting 1820" bar Max. setting
Disconnect the pushrod from the carburettor by rst carefully prising up the spring over the end of the rod, where it connects to the throttle lever (A). Then press the throttle lever forwards (B) while pressing the throttle pushrod backwards (C) and lifting it off the lever. Withdraw the throttle pushrod from the tank and lift it upwards without pulling it through the rubber inlet manifold. Carefully release the carburettor assembly from the right-hand rubber mounting and lift it upwards.

Carburettor heater CS 2147 H, CS 2149 H, CS 2152 H, CS 2156 H, CS 2159 H Retting

Heating element

Connect the leads to the stop switch.
Carburettor heater CS 2147 H, CS 2149 H, CS 2152 H, CS 2156 H, CS 2159 H Removing
Remove: carburettor 1 Remove the two screws from the clip above the carburettor. 1 Fit the heating element between the air lter connection and the carburettor as well as above the carburettor. 2 Tighten the bracket above the carburettor using the two bolts. 3 Connect the leads to the carburettor heater. Ret: carburettor
2 Disconnect the leads from the carburettor heater and remove the heating element. Heating element

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Air intake system removal
The air intake system comprises: inlet manifold insulating plate with clip carburettor ange impulse hose support ring 1 Remove: cylinder cover air lter carburettor HT lead starter assembly (CS 2141, CS 2145) Fuel tank (CS 2141, CS 2145) 2
Unscrew and remove the bolt from the silencer support. 4
Unscrew the four cylinder bolts. Lift up the cylinder so that the intake system insulating plate is free of the crankcase.
Unbolt the vibration damping spring between the cylinder and hand grip.
On models CS 2141 and CS 2145 there are cylinder bolts on the underside.

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Air intake system retting
Fit the inlet manifold (A) through the insulating plate in the carburettor ange cut-out (B), and check that the insulating plates impulse tube sits correctly in the inlet manifold. Fit the perforated brass support ring in the inlet manifold. Free the insulating plate from the cylinder by releasing the clamp using pliers. Remove the complete air intake system. 6 Remove: support ring carburettor ange from the inlet manifold insulating plate 2
Clean and inspect all parts carefully. If there are any cracks or other defects replace the damaged parts with new ones. Always use original parts. NOTE! When replacing the impulse hose it must not be lubricated with oil or grease.
Fit the air intake system on the cylinder and snap the insulating plate into position. Check carefully that the impulse tube is correctly seated against the cylinders impulse channel. 3
Position tool 17-01 between the carburettor ange and the insulating plate.

Connect pressure gauge 38-01 to the fuel hose. Pump the pressure up to 50 kPa (0.5 bar). The pressure should drop to 20 kPa (0.2 bar) within 60 seconds. 2

Replacing the fuel hose

NOTE! Do not use knurled pliers to disconnect or reconnect the fuel hose. This could damage the hose. 1 Before replacing the fuel hose, measure the length of hose between the crankcase and carburettor and between the tank and crankcase. The correct hose length between the tank and crankcase is 43 mm (1.69 inches). The correct hose length between the crankcase and carburettor is 53 mm (2.09 inches). 2 Remove the fuel hose from the fuel tank using tool 83-01. Trim off 5 mm (0.20 inches) from the mitred end of the hose. Fit the fuel lter and reinsert the hose in the tank.
Use gauge 37-01 to measure vacuum. Readings should be as follows: the vacuum should increase from 30 to 15 within 30 seconds. If readings are outside this range the vyon plugs must be replaced.

Fuel tank retting

1 Insert the fuel hose into the carburettor chamber. Ret the fuel tank. 2
Bolt the front vibration damping spring into position, followed by both stops and the remaining two vibration damping springs. Tighten to a torque of 23 Nm. Check that both vibration damping springs and the stops are correctly seated on the crankcase. Incorrect tting may result in higher vibration levels.

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Piston and cylinder removal
1 Remove: cylinder cover carburettor (see Carburettor removal) silencer spark plug fuel tank (applies to CS 2141, CS 2145)
Fit the throttle pushrod in the tank and connect it to the carburettor. Ret the spring. 4
Connect the fuel hose to the carburettor. Check that the hose is not kinked or too long to be clamped between the crankcase and tank. The correct hose length between the tank and crankcase is 43 mm (1.69 inches). The correct hose length between the crankcase and carburettor is 53 mm (2.09 inches) excluding the mitred section. 5
Unbolt the vibration damping spring from the hand grip. 3
Undo the four cylinder bolts and lift the cylinder off carefully. Models CS 2141, CS 2145
Connect the fuel hose to the carburettor. 6 Then ret: cable guide starter assembly (2.53 Nm) chain and guide bar clutch cover air lter cylinder cover 46 English
Undo the four cylinder bolts from the underside and lift the cylinder off carefully.
Repair instructions 4 Cover the opening in the crankcase. 5 8
When replacing the cylinder CS 2141, CS 2145: Unscrew the decompression valve. (CS 2145) Remove the intake system, see Air intake system removal. Remove the circlips from the ends of the gudgeon pin and press it out. Then lift off the piston. 6 Model CS 2150 is tted with a spacer, which is secured using four bolts from the underside. The spacer does not however need to be removed when removing the cylinder.

Remove the bearing from the little end of the connecting rod. 7 Clean all the components, scraping off all traces of old gasket and carbon from the following places: Piston crown Top of the cylinder bore Cylinder exhaust port Decompression valve channel (CS 2145, CS 2149, CS 2150, CS 2152) Cylinder base and/or crankcase Check the following: The surface coating of the cylinder is not worn through, especially in the upper part of the cylinder. If replacing the cylinder: Unscrew the decompression valve. Remove the intake system, see Air intake system removal. The cylinder is free from score marks and areas of wear. The piston is free from score marks. Small scratches can be polished out with ne emery paper. The piston ring is not burnt into its groove.

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Piston and cylinder retting CS 2147, CS 2149, CS 2150, CS 2152, CS 2156, CS 2159
Measure piston ring wear. This should not exceed 1 mm. Use the piston to push down the piston ring. The needle roller bearing is undamaged. The inlet manifold is undamaged. Pressure test the decompression valve. Also refer to Jonsereds Analysis guide for piston failures, art. no. 01-01. Lubricate the little end bearing with two-stroke oil and insert it in the connecting rod. 2
Decompression valve pressure testing
Connect tool 38-01 to the decompression valve. 2 Pump up the pressure to 80 kPa (0.8 bar). 3 Wait 30 seconds. 4 The pressure should not be less than 60 kPa (0.6 bar).
Fit the piston with the arrow pointing towards the exhaust port. Push in the gudgeon pin and t the circlips. If replacing the cylinder, t the decompression valve, tightening to a torque of 1214 Nm.

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Repair instructions 3 6
Fit the inlet manifold 63-01 to the cylinder. Check that the impulse tube is correctly seated in the impulse channel. NOTE! It is very important that there are no leaks in the inlet system, otherwise the engine may seize. 4 Fit a new cylinder base gasket. Compress the piston ring with tool 70-01 and lower the cylinder over it carefully. 7
Press the insulating plate 62-01 onto the cylinder. Check that the impulse tube connected to the insulating plate is seated correctly in the inlet manifold and lock the clamp over the manifold. 5 Lubricate the piston ring and piston with two-stroke oil.
Fit the cylinder bolts, tightening them in diagonal pairs to a torque of 810 Nm.

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Piston and cylinder retting CS 2141, CS 2145, CS 2152, CS 2159
1-5 See Piston and cylinder CS 2147, CS 2149, CS 2150, CS 2152, CS 2156, CS 2159 Retting points 1-5. 6 Apply silicone adhesive/sealing compound (037062) to the crankcases contact surfaces with the cylinder. Carefully slide the cylinder down over the piston towards the big end bearing. Note! Work is facilitated if the crankshaft complete with bearing and piston is released from the crankcase and the piston is pushed into the cylinder. The unit is then retted in the crankcase. 7

Crankcase and crankshaft reassembly CS 2156, CS 2159
Place the ywheel side of the crankcase over the crankshaft and pull the two crankcase halves together using assembly tools 30-18. 4
Hold the clutch side of the crankcase in a vice. Pull the crankshaft into its bearing using assembly tools 30-16. 2 Fit and tighten the six crankcase bolts to a torque of 810 Nm. Check that the crankshaft rotates freely. 5 Ret the following parts: bark rest oil pump* chain tensioner centrifugal clutch* 54 English Check that the guide pins are in place. Fit a new gasket to the mating surface of the clutch side of the crankcase.
Repair instructions 3 ignition system, 8-10 Nm, see Ignition module and ywheel - retting starter assembly, 2,5-3,5 Nm, see Starter assembly - retting cylinder cover clutch cover guide bar and chain NOTE! If a new crankshaft has been tted the saw must be run in for 3-4 hours with the carburettor adjusted to the factory settings.
Crankshaft complete CS 2141, CS 2145, CS 2150 reassembly
Place the ywheel side of the crankcase over the crankshaft and pull the two crankcase halves together using assembly tools 30-16. 4
1 Fit the crankshaft complete in the crankcase. Fit and tighten the six crankcase bolts to a torque of 810 Nm. Check that the crankshaft rotates freely. 5 Ret the following parts: bark rest, 8-10 Nm oil pump, 3-4 Nm, see Oil pump - retting chain tensioner centrifugal clutch, min 20 Nm, see Centrifugal clutch - retting fuel tank, see Fuel tank - retting piston and cylinder, see Piston and cylinder - retting generator, see Replacing the generator carburettor base, 3-4 Nm carburettor, 1-1,5 Nm, see Carburettor - retting throttle pushrod silencer, 12-14 Nm, see Silencer - retting CS 2150: Fit and tighten the four bolts holding the spacer from underneath and t the crankshaft complete in the crankcase. Ret the following parts: piston and cylinder* fuel tank* silencer* carburettor* throttle pushrod centrifugal clutch* generator* ignition system* starter assembly* cylinder cover clutch cover chain and bar * See special instructions.

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Repairing damaged threads
A repair kit, 33-01, is available for repairing damaged threads. First drill out the hole using: 6.1 mm drill bit for magnesium crankcase Then screw in the thread insert using a suitable bolt and spanner.

Guide bar bolts replacement
1 Drain the oil tank. 2 Knock through the old guide bar bolt so that it falls into the oil tank. 3 Remove the bolt from the oil tank. 4

Thread insert

A damaged thread can be repaired using a thread insert. The slotted part of the thread insert is screwed in rst, as this is the cutting part. To repair a thread that was originally designed for a PL5 screw: rst drill out with a 6.1 mm diameter drill bit, then screw in the thread insert using a suitable screw and spanner. To repair a thread that was originally designed for a MT6 screw: rst drill out with a 7.1 mm diameter drill bit, then screw in the thread insert using a suitable screw and spanner. This type of thread insert is best suited for use in plastic and magnesium, but not for repairing threads in aluminium. In that case use a helicoil insert with metric screw. New part no. 39-27 40-01 Description PL5 MT6 Fasten a steel wire to the thread of the new bolt, feed the steel wire into the oil tank and out through the bolt hole in the crankcase. 5 Pull the steel wire until the bolt comes out through its hole. 6 Pull through the bolt with its nut. Place a spacer between the nut and crankcase. 7 Check that the square shoulder of the bolt is correctly seated in the recess in the crankcase. 8 Rell with chain oil.

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Appendix A

Carburetors - EPA-models

Basic adjustment for EPA II carburetors valid from January 2002 After replacing the carburetor or high speed and/or low speed needle on an EPA (The US Environmental Protection Agency) certied product a basic adjustment must be carried out as described below in order to meet the EPA-requirements. This to achieve as low emissions as possible. This instruction is made for USA & Canada only. On EPA carburetors both the H- and L-needles are tted with caps to prevent the chain saw operator from changing the adjustment above EPA standard. The caps can be removed to achieve richer or leaner adjustments. To set the needles correctly an adjustment sleeve is tted from the factory over the caps to lock them in maximum allowed settings. When correctly set the caps must be xed on the needles. The adjustment sleeve then can be removed. NOTE! Before making any adjustments the following must be done! Mount, for this model, approved bar & chain combination (See Technical data in the Operators manual). Model CS 2141/CS 2145/CS 2150 Model CS 2149/CS 2152 Model CS 2147/CS 2156/CS 2159 15" 15" 16" 5. Let the engine run at B rpm ~ 1 minute, until warm. 6. Adjust the H-needle to a top speed of C rpm. Model CS 2141/CS 2145/CS 2150 Model CS 2149/CS 2152 Model CS 2156 Model CS 2147 Model CS 2159 C = C = C = C = C = 14 000

E = E = E = E = E = 13 500
2. Check that: The H-cap is adjusted to its richest setting. (Turned counterclockwise to stop.). The cap is not xed to the needle, it should rotate independently. Adjust the L-cap to a center position (1/4 turn counterclockwise = minimum, 1/4 turn clockwise = maximum). 3. Start the engine. If necessary, adjust the idling speed with the T-screw until the chain stops. 4. Adjust the H-needle to give a top speed of B rpm. Model CS 2141/CS 2145/CS 2150 Model CS 2149/CS 2152 Model CS 2159 Model CS 2147 Model CS 2156 B = B = B = B = B = 13 500
Use a narrow blade screwdriver (Ref.no. 48-63) and insert it through the hole in the cap (max. blade width 2 mm/0.08 inch).

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English 59

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