Jonsered CS 2152 C Manual
Jonsered CS 2152 C Chainsaw, size: 2.4 MB
Jonsered CS 2152 CWH
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Comments posted on www.ps2netdrivers.net are solely the views and opinions of the people posting them and do not necessarily reflect the views or opinions of us.
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).
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).
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
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.
Repair instructions 6 Rear handle heater Measure the resistance between F and Z. It should be 1 0.5 ohm. If not, replace the rear handle heater. Generator Measure the resistance between G and H. It should be between 0.31.3 ohm. If not, replace the generator. Carburettor heater Disconnect the lead at X and clean the connectors. Measure the resistance between X and G. The reading should be between 310 ohms. If not, disconnect the lead at Y and clean the connectors. Measure the resistance between X and Y, if the reading is not between 37 ohms replace the carburettor heater.
Unscrew the two bolts from the right side of the rear hand grip. Remove the throttle lock and throttle handle, see Throttle trigger. Pull out the heater element with the leads still connected.
Troubleshooting carburettor heater (CS 2147 W, CS 2149 W, CS 2152 W, CS 2156 W, CS 2159 W)
Operation The carburettor temperature is controlled by an electronic thermostat to eliminate the risk of ice formation in the carburettor. The thermostat switches on/off at 12C/54F. This means that the saw operator does not need to remember to switch the carburettor heater on or off. Troubleshooting Front handle heater Remove the side cover from the handle. Disconnect the leads at F and G (see diagram). Clean the connectors. Turn the switch on. Measure the resistance between F and G. The reading should be 41 ohms. If not, disconnect the lead at O and remove the switch. Measure the resistance between O and F. The reading should be 41 ohms. If the resistance is incorrect, replace the front handle. Disconnect the lead at N and G and measure the resistance between these points. The reading should be no higher than 0.1 ohm. If it is too high, replace the lead. Switch Measure the resistance between N and O with the switch turned off. The reading should be ohms or higher. Repeat the measurement with the switch turned on. The reading should be no higher than 0.1 ohm. If it is too high, replace the switch.
Heater element and rear hand grip removal
1 Remove the cylinder cover, hand grip cover, hand grip and right-hand stop. Then remove: throttle lock, throttle trigger and recoil spring, see Throttle trigger. 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. Ret: fuel tank with both stops and the rear vibration damping spring throttle lock, throttle trigger and recoil spring, see Throttle trigger. fuel hose and throttle pushrod to the carburettor (check that the hose is not trapped between the tank and crankcase, measurement 43 mm/1.69 inches) hand grip cover, air lter and cylinder cover
Hand grip heater on model CS 2147 W, CS 2149 W, CS 2152 W, CS 2156 W, CS 2159 W retting
1 Feed the leads into the rear hand grip and insert the heater element in the hand grip. Screw in the two bolts through the right side of the hand grip to secure the heater. 2
Press the black lead into the base of the carburettor and connect it with the bolt. Tighten to a torque of 34 Nm. 3 Run the red lead to the front hand grip and connect it. 4 Press the throttle trigger and throttle lock into position and check that they work correctly, see Throttle trigger. 5
1 Screw the heater element into place using the two screws and feed the leads through the rear hand grip. Secure the red lead in the clip on the tank and connect it. Feed the black lead through crankcase and secure/earth it to the base of the carburettor using the bolt at the front on the clutch side of the saw. Tighten to a torque of 34 Nm. 2 Ret: fuel tank with both stops and the rear vibration damping spring throttle lock, throttle trigger and recoil spring, see Throttle trigger. fuel hose and throttle pushrod to the carburettor (check that the hose is not trapped between the tank and crankcase, measurement 43 mm/1.69 inches) hand grip cover, air lter and cylinder cover
Bolt the vibration damping springs that hold the tank unit back in place and ret the cover over the front hand grip.
Starter assembly removal
Clean the parts and check the following: The starter cord. The teeth on the pulley, lubricate with oil. That the pawls on the ywheel are undamaged, i.e. that they spring back towards the centre and move freely. Lubricate the return spring with light oil.
Replacing a broken or worn starter cord
Undo the four bolts that fasten the starter assembly to the crankcase and lift off the starter assembly. 2
Before replacing a worn starter cord the tension in the recoil spring must be released. Pull the starter cord out through the notch in the pulley rim and wind the pulley anti-clockwise to release the tension in the spring. 2 Remove the bolt from the centre of the pulley and lift off the pulley. 3 Models CS 2141, CS 2145, CS 2147, CS 2149, CS 2150, CS 2152
Pull out about 30 cm of the cord and fasten it in the notch in the pulley rim. Release the tension in the return spring by letting the pulley wind backwards slowly. 3 WARNING! If the recoil spring is still under tension when the pulley is removed it can y out and cause injury. Wear eye protection.
Remove the bolt from the centre of the pulley and lift off the pulley.
Fit a new cord through the hole in the pulley and tie a knot to secure it. Feed the other end of the cord through the hole in the starter housing and through the starter handle, then tie a double knot in the end. Wind about 3 turns of the starter cord onto the pulley. Fit the bolt through the centre of the pulley and tighten to a torque of 23 Nm.
Repair instructions Model CS 2156, CS 2159
Replacing a worn recoil spring
WARNING! Make sure the recoil spring does not y out and cause injury. Wear eye protection.
1 Remove the bolt from the centre of the pulley and lift off the pulley and spring. 2 Remove the broken recoil spring. For model 2159: remove the recoil spring cassette. Cleaning and inspection: Clean and inspect all parts carefully. If there are any cracks or other defects replace the damaged parts with new ones. Lubricate the return spring with light oil. 3 Models CS 2141, CS 2145, CS 2147, CS 2149, CS 2150, CS 2152
Tensioning the recoil spring
1 Models CS 2141, CS 2145, CS 2147, CS 2149, CS 2150, CS 2152 Fasten the starter cord in the notch in the pulley rim and wind the pulley about 2 turns clockwise. Check that the pulley is free to rotate at least another half turn when the starter cord is fully extended. Model CS 2156, CS 2159
Fit a new recoil spring, with the retaining wire still in place. Do not remove the wire until the spring is in position. If the spring comes loose when you put it in place wind it up from the outside working inwards. Lubricate the recoil spring with light oil. 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
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.
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).
Push the crankcase up a little from the fuel tank and screw on the lter (A) from underneath.
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.
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.
Remove the rubber inlet manifold using a large screwdriver. 4
When replacing the thermostat: Disconnect the cable from X and V. Trouble shooting, see page 20. On saws with carburettor CS 2147 H, CS 2149 H, CS 2152 H, CS 2156 H, CS 2159 H Replacing the heating element: Lower the rear section of the tank by removing the bolt between the hand grip cover and vibration damping springs. Remove the starter and then loosen the stop screws on both sides (one is located under the starter and this must be removed rst). Now disconnect the cable from X and Y. Dismantling the carburettor: Loosen the high, low and idling jet screws.
Undo and remove the carburettor bolts. Lift off the carburettor. On saws with a carburettor heater CS 2147 H, CS 2149 H, CS 2152 H, CS 2156 H, CS 2159 H Heating element
Remove the brackets two bolts above the carburettor. Disconnect the cable connections to the carburettor heater and remove the heating element.
Clean all the carburettor components in petrol. Use an airline to dry off the petrol from all components. Blow through all the channels in the carburettor body and check that they are not blocked. Check that: The gasket, pump diaphragm and metering diaphragm are undamaged. There is no play in the throttle and choke valves.
The needle valve and its lever arm are not worn. The fuel lter is undamaged. The tips of the high and low speed jet screws are not damaged. The air intake duct is not cracked.
The item numbers in the diagram refer to the steps below (17). 1 Remove the cover from the metering unit and carefully remove the metering diaphragm and gasket. 2 Undo the screw and take out the needle valve, together with the lever arm, spindle and spring. 3 Remove the cover from the pump unit and carefully remove the gasket and pump diaphragm. 4 Remove the fuel lter. 5 Remove the high, low and idling jet screws. (HDA 159A high and low jet screws are protected by plastic caps which can be prised off with a screwdriver. Only on EPA, see appendix A.) 6 Remove the plug by rst drilling a hole in it and then prising it out with a screwdriver or the like. 7 If necessary remove the throttle and choke valves, and remove the spindles together with the lever arms and springs. 36 English NOTE! Cleanliness is very important when reassembling the carburettor. Tiny particles of dirt can cause operating problems.
The item numbers in the diagram refer to the steps below (18).
Repair instructions 1 If the throttle and choke butteries and their spindles were removed, these must be retted. Lubricate the spindle bearings with light oil. 2 Insert the plug in the hole with the convex side upwards and expand it by pressing downwards with a drift. 3 Ret the high and low speed jet screws and springs, plus the idling screw. Fit the plastic caps over the high and low speed screws. 4 Fit the fuel lter, using the handle of a small screwdriver. 5 Fit the pump diaphragm, gasket and cover to the pump unit. 6
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
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.
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.
For instructions on adjusting the EPA carburettor see appendix A. Adjusting the carburettor involves adjusting the engine to the local conditions e.g. climate, altitude, fuel and type of two-stroke oil. The carburettor is equipped with three adjustment options. L = Low speed jet H = High speed jet T = Idling adjustment screw
Basic requirements Before making any adjustments the air lter should be clean and the cylinder cover should be in place. If the carburettor is adjusted with a dirty air lter, the mixture will be too weak next time the air lter is cleaned. This can cause serious engine damage. Carefully screw in the L and H jets fully, then back them off 1 turn. The carburettor now has the settings H = 1 and L = 1. Start the chainsaw and allow it to warm up for 10 minutes. Place the saw on a at surface so that the guide bar is pointing away from you and the guide bar and chain are not touching the surface. Low speed jet L Find the highest idling speed by slowly screwing the L screw in and then out again. When the highest speed has been found, screw out the L screw 1/8 - 1/4 turn.
Fuel tank removal
WARNING! The fuel used in chainsaws is harmful if inhaled, may cause skin irritation and is highly ammable. 1 Empty the fuel tank. 2 Remove the following: cylinder cover air lter clutch cover chain and guide bar starter assembly cable guide 3 Disconnect the fuel hose from the carburettor. 4
Unscrew both stops and the three vibration damping springs from the ywheel side and clutch side of the engine. 6
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.
Disconnect and remove the fuel hose from the crankcase.
Carefully check that: there are no leaks from the fuel tank there are no leaks from the tank ller cap the fuel hose is undamaged and free from wear the fuel lter is not clogged the tank vent is not blocked or leaking the vibration damping springs and stops are not damaged
Tank vent testing
Replacing the fuel lter
NOTE! Do not use knurled pliers to disconnect or reconnect the fuel hose. This could damage the hose and lead to leakage or fracture. 1 First remove the old fuel lter from the tank unit using special tool 83-01. 2 Pull the fuel hose out of the tank and pull off the lter. 3 Fit the new fuel lter and feed the fuel hose back into position.
Cylinder pressure testing
Loosen the carburettor bolts so that the carburettor can be moved back about 4 mm. Insert cover plate 11-02 between the carburettor and the carburettor ange. Tighten the carburettor bolts to a torque of 11.5 Nm. Loosen the silencer bolts so that the silencer can be moved back about 4 mm. Insert cover plate 11-02 between the silencer and the exhaust ange on the cylinder ange. Tighten the silencer bolts to a torque of 810 Nm. Unscrew and remove the spark plug. Screw in pressure test nipple 40-02. Connect tool 38-01 to the nipple. The decompression valve must be closed. The decompression valve must be closed. To check the decompression valve itself, see Decompression valve pressure testing. Pump up the pressure to 80 kPa (0.8 bar). Wait 30 seconds. The pressure should not be less than 60 kPa (0.6 bar). Remove the cover plates from the silencer and carburettor, tighten the bolts to the specied torque. Remove the pressure test nipple 40-02 and ret the spark plug. WARNING! After pressure testing the cylinder, check that the inlet manifold is seated correctly, otherwise the saw may be damaged.
Fit the cylinder bolts, tightening crosswise to a torque of 1315 Nm. 8 Pressure test the cylinder. 9 Ret: spark plug, tighten to a torque of 15 Nm carburettor, see Carburettor retting, silencer, tighten to a torque of 810 Nm cylinder cover
NOTE! If a new piston or cylinder has been tted the saw must be run for the rst 34 hours with carburettor adjusted to the factory settings.
Crankcase and crankshaft dismantling CS 2147, CS 2149, CS 2152, CS 2156, CS 2159
1 Remove the following: guide bar and chain clutch cover cylinder cover starter assembly* ignition system* generator* centrifugal clutch* oil pump* bark rest chain tensioner throttle pushrod carburettor* carburettor base silencer* piston and cylinder* fuel tank* * See special instructions. NOTE! Take care to prevent dirt or foreign particles getting into the bearings. 2
Split the crankcase with the aid of tool 6101 (A) and stop plate 18-01 (B), working from the ywheel side of the saw. 4
Press the crankshaft out of the ywheel side of the crankcase using tool 61-01. 5 Do the same on the clutch side without using stop plate 18-01.
Unscrew the 6 bolts that hold the crankcase together.
Crankshaft complete - dismantling CS 2141, CS 2145, CS 2150
1 Remove the following: chain and bar clutch cover cylinder cover starter assembly* ignition system* generator centrifugal clutch* throttle pushrod carburettor* silencer* piston and cylinder* fuel tank* * See special instructions. 2
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.
7. Check that the H-cap is still adjusted to its richest setting. (Turned counterclockwise to stop). NOTE! The H-needle must not rotate! 8. Gently knock the H-cap into position. Use a 5 mm/0.2 inch mandrel (for ex. the locking pin for the bevel gear ref.no. 61-03). This is a basic carburetor adjustment. Further ne adjustments, within the limits the caps allow, may be necessary to achieve optimum performance. See the Operators manual. Replacement of the L-needle 1. Take off the cap from the L-needle using e.g. a pair of cutting pliers and unscrew the needle. 2. Screw the new L-needle to the bottom and then turn it counterclockwise 1 1/2 turns. 3. Press a new L-cap on the L-needle to the rst stop, which means that the cap is not xed to the needle, it should rotate independently. 4. Adjust the L-cap to the richest position (turned counterclockwise to stop) without turning the needle. 5. Let the engine run at ~ E app.1 minute until warm and then let it run on idle. Model CS 2141/CS 2145/CS 2150 Model CS 2149/CS 2152 Model CS 2159 Model CS 2147 Model CS 2156 6. Adjust the idle speed to rpm. 7. Adjust the L- needle until the highest possible idling speed is achieved and then turn the L-needle 1/2 turn counterclockwise. Use a narrow blade screwdriver w. ref.no. 48-63 and insert through the hole in the cap (max. blade width 2 mm/0.08 inch) NOTE! If the chain rotates, turn the idling speed screw (T) counterclockwise until the chain stops. 8. Check that the L-cap is still adjusted to its richest position. (Turned counterclockwise to stop) NOTE! The L-needle must not rotate! 9. Gently knock the L-cap into position. Use a 5 mm/0.2 inch mandrel (for ex. the locking pin for the bevel gear ref.no. 61-03). This is a basic carburetor adjustment. Further ne adjustments, within the limits the caps allow, may be necessary to achieve optimum performance. See the Operators manual.
The chain should not be tensioned more than that it remains ~0,2 inches to the bar. Mount a new air lter. Replacement of the H-needle or complete carburetor 1. Screw the new H-needle to the bottom and turn it counterclockwise A turns. Model CS 2141/CS 2145/CS 2150 Model CS 2149/CS 2152 Model CS 2147/CS 2156/CS 2159 A = 3/4 A = 3/4 A = 3/4
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
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