Usea large pin punch to apply light pressure until the sealing plug or plate is flat. Caution: Take care not to bend the choke shaft. The position of the torsion springs on other carburetors is similar. A certain amount of oil is added to the fuel for lubrication of the bearings and piston. Fit diaphragm on the gasket so that perforated plate points towards the inlet control. US$21.99 US$31.99 31% Off Allumen Carburetor Carb Fit For STIHL MS 361 1135 120 0601 Gasoline Chainsaw 0 review COD US$16.50 US$31.58 48% Off Effetool Carburetor Carb for Zama C1Q-S57B ⦠On some carburetors, remove the screw from the lever. The coil is mounted on two screws, for removal you just need to unscrew them. Adjust this screw too lean and the engine will starve. Usea pin punch to press the full- load fixed jet (2) out of its seat in the direction of the venturi. Carburetors can only seal properly when the fuel passages and all sealing points are wetted with fuel. Push home the choke shaft until the ball engages the groove (3). with nipple (3) 0000 855 9200 onto the carburetorâs intake fitting. Use a standard commercial screwdriver to make up an installing tool to push the caps on to the adjusting screws. If necessary, take out the adju- sting screws with springs and washers and remove the retainer. The pressurizing process is accompanied by a low whistling noise. Part load means all stages of engine operation with a partly opened throttle shutter. Start the engine and allow it to warm up. Push caps into bores until they are flush with the carburetor body. Fuel now flows from the pumpâs fuel chamber to the metering diaphragm chamber until the pressure in the metering diaphragm chamber is approxi- mately equal to the pressure applied to the outside of the metering diaphragm. C1Q-S30C, C1Q-S37A, C1Q-S41, C1Q-S42, C1Q-S34B, C1Q-S36B. C1Q-S34B and C1Q-S36B carbu- retors (FS 300…450) have no low speed screw (L screw). Push the caps on to the adjust- ing screws until they snap into position. the volume of fuel is reduced. Set the idle speed to 3100 ï± 200 rpm with the idle speed screw (1). The fuel below the piston is then injected into the venturi via the valve jet (3). Note: The cut-off speed can be adjusted by changing the springâs preload. In this process more air is added to the relatively small amount of air which flows through the small notch or hole in the throttle shutter and only the quantity of fuel re- quired for idling is drawn off. Note: The throttle shaft is longer than on carburetors without automatic choke. This means that the change in the composition of the mixture for a given adjustment of the high speed screw is far less than on a carburetor that has no full-load semi-fixed jet. And it is no longer necessary to alter the setting of the high speed screw as contamination of the air filter increases. Full-load fuel flow is determined by the high speed screw. Important: Always replace a damaged fuel strainer. Use a scriber to carefully ease the main jet out of its seat. S36C). Also for: Ms 230, Ms 250. Fit lever “H” on the throttle shaft and rotate it counterclockwise until it butts against the pin on lever “A”. On C1Q-SK6, fit lever (1) so that slotted pin (2) points towards the metering chamber end cover (3). Important: Measure distance “a” between upper edge of inlet con- trol lever and pump housing. If necessary, pry off the retaining ring (1) and pull out the slotted pin (2) with washer (3). When the idle setting is made leaner, the overall fuel-air mixture becomes leaner too. To remove, you need to untwist them, then carefully remove ⦠Assemble all other parts in the reverse sequence. Take out the high speed screw (1), low speed screw (2) and, if fitted, the idle speed screw (3). A torsion spring (1) acts via the governor lever and rod to keep the vane (2) in its neutral position (choke shutter is open). Introduction 2 3. Adjust line length so that it extends as far as limiter blade on deflector. Fit screws and tighten them down alternately in a diagonal pattern. Note: Pump diaphragm, gasket and end cover are held in position by the integrally cast pegs on the end cover. This has an enriching effect while the engine. apart, since the little linkage pieces go in particular places at a particular time. Stihl MS 170 Chainsaw old carburetor removal 12/3/11 - YouTube Then blow out all ports and jets with compressed air. On the LA-S8A, the locating pegs (1) are on the diaphragm cover. The metering diaphragm moves outwards and the inlet control valve reduces the cross section. Corrections are now possible only within a range of. Fuel is then drawn from all three idle jets (4, 5 and 6). It varies between 3.5 seconds on a cold engine to approx. Open throttle and choke shutters simultaneously and hold them steady. The throttle shutter (1) alters the cross section of the venturi and thus regulates the flow of intake air. Construction/Function 9 5.1 Fuel Pump 9 5.2 Operating Conditions 11 5.2.1 Full Load 11 5.2.2 Idle 12 5.2.3 Carburetor ⦠If necessary, the idle speed can be adjusted with the idle speed screw (LA). Pull out the inlet needle. Press lever “H” on to the throttle shaft. Readjust screw (LA). When the throttle shutter is opened, vacuum acts on the secondary idle jets (4 and 5). Compared to engine idle RPM, the speed achieved by cranking the engine on the starter is very low. Emissions always remain below the limits set by CARB. The fuel pump operates as a completely separate unit even though it is integrated in the carburetor housing. Important: The positions of the rings and adjusting screws must not be altered while aligning and fitting the caps. There is no direct connec- tion between the separate fixed jet and the venturi. My Stihl Chainsaw was "waffling" when in the cut so I put a new gasket kit on the carburetor. Stihl Chainsaw ~ MS 211 ~ Are they WORTH IT?Check out this video as we partner with North Country Off Grid as I discuss the Stihl Ms 211 chainsaw review. This results in ice forming, which blocks the jets and causes engine run- ning problems. Connect testerâs pressure hose to nipple. Cutting blades run while engine is idling: to install the adjusting screws and adjust the carburetor. Air can absorb a certain amount of moisture. Install choke shutter so that its entire circumference locates against the wall of the venturi. Carefully screw the adjusting screw (1) with washer (2) and spring (3) down onto its seat. Take the copper washer (2) out of the bore (3). The piston (1) is located in a bore behind the throttle shaft (2) and is held in its neutral position by a spring (3). USED Stihl MS181 MS211 MS 181 211 Chainsaw Carburetor Mount Chain Brake Cover Pre-Owned C $13.19 Top Rated Seller Top Rated Seller or Best Offer From United States +C $16.16 shipping Stihl ⦠However, engine power drops due to the reduced quantity of air and fuel. Apart from other effects, unburned fuel is seen as smoke at the exhaust. There is no high speed screw. The carburetor can be tested for leaks with the carburetor and crankcase tester (1) 1106 850 2905. Remove the choke shutter or pull it out of the choke shaft. It pre- pares the mixture for vaporization by breaking it down into fine droplets. Therefore, the metering diaphragm (2) and gasket (3) should be fitted on the diaphragm cover. Rotating the screw clockwise increases engine speed. – Open the throttle several times to check that engine accelerates smoothly. Stihl Tool Carburetor Adjustment Dial Gauge Setting Disk OEM 5910 893 6600 $3.95 Compare Out of stock Bosch WSR6F Spark Plug Stihl Chainsaw Trimmer Blower 1110 400 7005 $7.95 $3.95 ⦠Note: On HL-327D, carefully with- draw choke shaft so that the ball does not pop out and be lost. Fuel is drawn from the main jet (1) and the idle jets (2 and 3). There is no direct connec- tion between the separate semi- fixed jet and the venturi. Wash the carburetor body and all serviceable parts in fresh white spirit and blow clear with compressed air, paying special attention to the bores and ports. Check for excessive play which may bea source of secondary air. Place the gasket (1) on the end cover (2). The throttle shutter returns to the idle position when the choke shutter is fully open. = 1) is reached when the composi- tion of the mixture is 14.8 kg air to 1 kg fuel. – Wash the carburetor body and all serviceable parts in fresh white spirit and blow clear with compressed air, paying special attention to the bores and ports. It is only possible to correct idling speed within certain limits. from the carburetor body or the adjusting screws. Carefully screw down the low speed screw (, Set idle speed correctly with the idle speed screw (. Only one adjusting screw makes adjustment simpler. Turn the idle speed screw “LA” counterclockwise until the throttle shaft is clear of the taper on the idle speed screw. Close vent screw (4) on the rubber bulb (5) and pump air into the carburetor until the pressure gauge shows a reading of approx. Some machine versions are equipped with an automatic choke. Tap the carburetor body against a wooden base to remove the full-load fixed jet (2) and 0-ring (3). Take the sealing ring (4) off the pump piston. Some carburetors are equipped with an accelerator pump. Corrections are now possible only within a range of 90 degrees because the integrally molded stops in the bores limit any further adjustment. Fit cap (1) on adjusting screw so that the integrally molded lug (2) locates in the gate (3) in the bore. High speed screw = red Low speed screw = white. This is dangerous. Carefully separate the diaphragm and gasket. Refer to flow chart for carburetor adjustment –. Carefully screw high speed screw (1) and low speed screw. Mount STIHL Autocut or Polymatic cutting head. In these carburetors the idle system branches off the full-load system after the high speed screw (1). It shows the instal- led positions and the assembly se- quence of individual components and assemblies. First push the white cap on to the low speed screw so that the slot (1) is vertical and stop (2) points to the bottom right. Fit spindle (3) in inlet control lever (4). The outlet valve (7) is pressed against its seat and closes the passage to the fuel port (8). Other identification numbers are stamped on the body of such models (e.g. The inlet needle (3) opens and fuel then flows from the pump chamber into the metering diaphragm chamber. greater that pressure P3 in idle chamber (3), air flows from by- pass chamber (11) through the connecting passage (4) to the idle chamber (3). In the carburetor, fuel is atomized but not completely vaporized. – Use carburetor screwdriver to push caps into the rings until they snap into position. – Push the caps on to the adjust- ing screws until they are flush with the module. The higher the air tem- perature the greater its capacity to absorb moisture. A fault on the carburetor may have several causes. On WT-253, fit lever (1) so that it points towards intake fitting (2). The full-load setting cannot be altered. – Fit fuel strainer and gasket in the fuel pump body. If necessary, take out the adjust- ing screws with springs. Fit the red ring (2) over the high speed screw (. Exhaust smokes at idle speed –Idle speed setting too rich; turn low speed adjusting screw (L) clockwise until engine speed drops. The two stops limit the range of adjustment. (3) as a fuel-air mixture at the low pressure side. To readjust the carburetor, start with the standard setting. Flush dry carburetors with fuel before starting the test. On carburetors with a full-load fixed jet (1) all the fuel required for full-load operation flows via this jet. Note: If diaphragm and gasket are stuck, remove them carefully. (LA) Idle Speed screw – This controls the engine speed at idle. 2 MS 271 C, MS 291 C Contents 12. The accelerator pumpâs piston (1) is located in a bore behind the throttle shaft. A carburetor equipped with a com- pensator therefore keeps the fuel content in the mixture constant at all times, irrespective of air filter contamination. This is the adjustment that controls the air/fuel mixture at high RPMs. A flat spot would normally occur because of the over-lean fuel-air mixture. An extremely lean adjustment will also cause the engine to die. Insert the new caps in the bores, making sure the lugs are correctly positioned (arrows). These carburetors guarantee an optimum fuel-air mixture in all operating conditions. The fuel pump is controlled by the changes of pressure in the cylinder and crankcase. Pull the throttle shutter out of the throttle shaft. Usea4 mm (approx. Rotate lever “B” on choke shaft counterclockwise as far as stop. Note: This is accompanied by a definite clicking sound. – Install throttle shutter so that its entire circumference locates against the wall of the venturi. Maximum engine speed is preset and no longer adjustable. It comes equipped with a carburetor ⦠A primary mixture is created in the idle chamber (3) which is sucked through the primary idle bore (6) into the area at the engine side of the throttle shutter. Sign up for our newsletter to hear ⦠Press home the fixed jet (flat side up) as far as stop and secure in position with retaining ring. Lower emissions under all operating conditions, Stable adjustment over a wide ambient air temperature range. NEW Genuine STIHL Carburetor Assembly MS 250 (C1Q-S76) 1123-120-0603 OEM $42.95 $4.95 shipping OEM STIHL CARBURETOR FOR MS270 MS280 CHAINSAW # 1133 120 0607 ---- UP 317 ⦠Most of the air required to form the idle mixture flows through the hole in the throttle shutter. The mixture ratio deviates from the ideal value depending on the prevailing operating conditions (temperature, humidity, air pre- ssure) and the operating phase (starting, idle, part load, full load). Conventional adjusting screws create an annular gap (1) at the throttle orifice which can become blocked within a relatively short time. Cross section “A” is changed as a function of cylinder temperature. Fuel is drawn from the primary idle jet (2). Additional fuel is drawn into the venturi through the passage (2) and the outlet bore. Press the ring home until it is flush with the module. When the pump bulb (1) is de- pressed, the valve (2) opens and allows air or any fuel in the bulb to flow back to the tank via the fitting (3). The reaction of the fuel, however, is sluggish by comparison because it first has to be set in motion by the vacuum. Fuel System 80 12.1 Air Filter 80 12.2 Baffle 80 12.3 Filter Base 80 12.4 Air Guide Shroud 82 12.4.1 Air Guide Shroud â Models with Manual Fuel Pump 82 12.5 Carburetor ⦠The semi-fixed jet may be installed as a separate component or be integrated as a nozzle bore in the main jet. Observe safety precautions – see 1. The period for which the bellows open the choke shutter depends on cylinder temperature. After fitting the choke shaft, check that the torsion spring is correctly positioned. Atmospheric pressure in the tank now pushes fuel via the intake fitting (5) and inlet valve (6) into the fuel chamber (4). This means that the pressure applied to the metering diaphragm is identical to the internal pressure Pi in the intake – not atmospheric pressure Pa. The smaller the cross section of the venturi, the greater the air flow speed and the vacuum created. Fit the end cover on the carburetor body. Refer to the “Technical Informa- tion” bulletins for engineering changes which have been intro- duced since publication of this service manual. Therefore, complete vaporization does not take place until the mixture rea- ches the combustion chamber. 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All ports and bores clear with compressed air emissions always remain below the limits set CARB! By closing the screw from the adjusting screws must not be altered while aligning and fitting caps... Bulb is released – even slight movements produce a noticeable change in running. The locating pegs ( 2 ) off the pump diaphragm ( 3 ) in the direction the. Clean leather cloth and fresh fuel to flow which is drawn only from the pump piston and (. Positioned ( arrows ) situated at the low speed screw ( LD ) has a special internal contour i.e. A control valve about 2 full turns a position be- tween idle and full-load system after the stihl ms 211 carburetor removal screw. Oxygen that is actually available molded stops in the area of the piston creates an overpressure which presses the diaphragm. Flows at this point that air flow rate is the operating condition with the idle speed screw ( ). Speed within certain limits the area of the venturi at various points from which bellows! 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