Stihl MS 271 Manual
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Stihl MS 271 Manual

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STIH)
STIHL MS 271, 291
2010-06

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Summary of Contents for Stihl MS 271

  • Page 1 STIH) STIHL MS 271, 291 2010-06...

  • Page 2: Table Of Contents

    Tensioning the 5.4.2 Brake cable Rewind Spring Removing and Replacing the Installing Rewind Spring Cam Lever Pins Chain Tensioner 5.7.1 Quick chain tensioner 31 Bar Mounting Studs © ANDREAS STIHL AG & Co. KG, 2010 MS 271 C, MS 291 C...
  • Page 3 12.10.2 Removing and Installing 12.11 Fuel Intake 12.11.1 Pickup Body 12.11.2 Fuel Hose 12.11.3 Fuel Hose – Models with Manual Fuel Pump 12.11.4 Manual Fuel Pump 12.11.5 Tank Housing Special Servicing Tools Servicing Aids MS 271 C, MS 291 C...

  • Page 4: Introduction And Safety Precautions

    They must not be passed to third parties. Engage the bar mounting studs in the outer bores in the mounting plate and secure the machine in position with the M 8 nuts (arrows). MS 271 C, MS 291 C...

  • Page 5: Safety Precautions

    Install new fuel hoses either dry or Always wear suitable protective Always use original STIHL with the aid of STIHL press fluid, gloves for operations in which replacement parts. b 14. components are heated for They can be identified by the STIHL assembly or disassembly.

  • Page 6: Specifications

    0.20 (+ 0.1/- 0.05) mm Spark plug (resistor type): NGK BPMR 7 A Electrode gap: 0.5 mm Chain Lubrication Speed-controlled oil pump with reciprocating piston Oil delivery rate: 8.0 (+/2.0) cm /min at 10,000 rpm MS 271 C, MS 291 C...

  • Page 7: Tightening Torques

    P 4x12 Side plate/engine housing Collar nut Carburetor / collar screw, 1st stage, fan side Collar nut Carburetor / collar screw, 2nd stage, sprocket side Collar nut Carburetor / collar screw, 3rd stage, fan side MS 271 C, MS 291 C...
  • Page 8 Coat micro-encapsulated screws with medium strength Loctite 242 or 243 before reinstalling. Power screwdriver setting for polymer: DG and P screws max. 500 rpm Do not use an impact wrench for releasing or tightening screws. Do not mix up screws with and without binding heads. MS 271 C, MS 291 C...

  • Page 9: Troubleshooting

    Replace the clutch springs Loud noises Clutch springs stretched Replace all clutch springs Needle cage damaged Fit new needle cage Clutch shoe retainer broken Install new retainer or clutch Clutch shoes and carrier worn Install new clutch MS 271 C, MS 291 C...

  • Page 10: Chain Drive

    Saw chain does not stop Brake spring stretched or broken Fit new brake spring immediately when brake is activated Brake band stretched or worn Fit new brake band Clutch drum worn Install new clutch drum MS 271 C, MS 291 C...
  • Page 11 Adjust brake cable Coasting brake does not disengage lever properly even though lockout lever is depressed QuickStop Super Brake cable overtensioned Adjust brake cable Braking action of coasting brake inadequate – lockout lever not depressed MS 271 C, MS 291 C...

  • Page 12: Chain Lubrication

    Install new oil intake hose damaged Engine housing cracked Install new engine housing Oil pump delivers insufficient oil Oil pump damaged or worn Install new oil pump Worm driver is loose Install new worm MS 271 C, MS 291 C...

  • Page 13: Rewind Starter

    Install new carrier Spring loop in spring housing not Attach spring loop to carrier attached to carrier Starter rope is difficult to pull – Spring in spring housing fatigued Install new spring housing models with ErgoStart MS 271 C, MS 291 C...
  • Page 14 (spring windings degreasant (containing no stick together) or moisture has got chlorinated or halogenated onto the rewind spring (spring hydrocarbons), then pull rope windings frozen together) carefully several times until normal action is restored MS 271 C, MS 291 C...

  • Page 15: Ignition System

    Damaged insulation or break in ignition lead or short circuit Check ignition lead/module, replace ignition module if necessary Check operation of the spark plug, clean or replace spark plug if necessary. MS 271 C, MS 291 C...

  • Page 16: Carburetor

    Replace tank vent Leak in fuel hose from tank to Seal connections or install new fuel carburetor hose Engine loses power during Sealing ring or spring in accelerator Install new carburetor acceleration pump worn or damaged MS 271 C, MS 291 C...
  • Page 17 Saw chain rotates at idle speed Engine idle speed too high Readjust with idle speed screw LA (counterclockwise) Clutch springs stretched or fatigued Replace the clutch springs or install new clutch Clutch spring hooks broken Replace the clutch springs MS 271 C, MS 291 C...
  • Page 18 – key in flywheel has sheared off Engine running extremely rich, has Choke shutter does not open Check carburetor and choke shaft, no power and a very low maximum service or replace if necessary speed MS 271 C, MS 291 C...

  • Page 19: Engine

    Thoroughly clean all cooling air inlets in fan housing blocked or openings and the cylinder fins cooling fins on cylinder very dirty Air inlet in fan housing dirty Clean air inlet in fan housing MS 271 C, MS 291 C...

  • Page 20: Clutch

    – Reassemble all other parts in the – Remove the clutch drum, b 4.1 reverse sequence. : The locking strip (1) – Remove the shroud, b 6.4. 0000 893 5903 must butt against the cylinder wall (arrow) as shown. MS 271 C, MS 291 C...

  • Page 21: Chain Brake

    – the chain must come to an abrupt stop. : Take out the screws (2). : Remove the cover (1). MS 271 C, MS 291 C...
  • Page 22 – Reassemble all other parts in the reverse sequence. : Push the brake band (1) into its seat (arrow) as far as stop. : Fit the screw (2) on the underside of the machine and tighten it down firmly. MS 271 C, MS 291 C...

  • Page 23: Brake Lever

    : Take the brake lever (2) out of the hand guard (1). : Remove the retaining ring (1). – Inspect the pivot pins and replace if necessary, b 5.6 – Inspect the cam lever and replace if necessary, b 5.5 MS 271 C, MS 291 C...
  • Page 24 (arrows). the pivot pins. : Attach the brake spring (1) to the brake lever (arrow). : Fit the retaining ring (1). MS 271 C, MS 291 C...

  • Page 25: Brake Lever On

    The brake spring is now relaxed. – Inspect the cam lever and replace if necessary, b 5.5 : Use the assembly tool 1117 890 0900 to disconnect the brake spring (1) from the anchor pin (arrow). MS 271 C, MS 291 C...
  • Page 26 : Slip the spacer washer (1) onto the pin (2). : Push the brake cable nipple (1) into its seat (arrow). : Hold the brake lever (2) so that the brake spring attachment point (arrow) is at the top. MS 271 C, MS 291 C...

  • Page 27: Brake Cable

    A certain free travel is necessary to when the lockout lever is released. guarantee correct operation of the coasting brake. – Troubleshooting, b 3.2 : Attach the spring (1) to the brake lever (arrow). MS 271 C, MS 291 C...
  • Page 28 – Install the throttle rod, b 10.3.4 : Take out the screw (1). – Fit the handle molding, b 10.3 : Remove the brake cable retainer (2) with brake cable. – Reassemble all other parts in the reverse sequence. MS 271 C, MS 291 C...

  • Page 29: Installing

    : Pull out the brake cable (4). tighten it down firmly. : Push the brake cable nipple (1) into its seat (arrow). : Thread the brake cable (1) between the fuel hose (2) and fuel return hose (3). MS 271 C, MS 291 C...

  • Page 30: Cam Lever

    : Attach the spring (1) to the anchor pin (2). The cam lever is not yet under tension – the spring may become detached. – Reassemble all other parts in the reverse sequence. – Lubricate the cam lever, b 14 MS 271 C, MS 291 C...

  • Page 31: Pins

    : Drive home the pins (1 and 2) as specified below. : Pin (3) a = about 11.0 - 11.4 mm Pin (4) b = about 4.6 - 4.8 mm Pin (5) c = about 5.1 - 5.3 mm MS 271 C, MS 291 C...

  • Page 32: Chain Tensioner

    (4), tensioner slide (1), into position. spur gear set (2) and replace as necessary. – Clean all disassembled parts, b 14 – Lubricate thread with STIHL multipurpose grease, b 14 – Reassemble in the reverse sequence. MS 271 C, MS 291 C...

  • Page 33: Bar Mounting Studs

    5910 893 0501 (1) over the collar studs (2) as far as it will go and unscrew the studs counterclockwise. – Coat the collar studs with threadlocking adhesive, fit and tighten down firmly, b 14 MS 271 C, MS 291 C...

  • Page 34: Engine

    – Use a blunt tool to push home the new plugs : Take out the screws (1). – take care not to damage the plugs. : Remove the muffler (2), check and replace if necessary. – Remove the exhaust gasket. MS 271 C, MS 291 C...

  • Page 35: Leakage Test

    = 39.25 mm – Pull off the boot and unscrew the c = 6 mm spark plug. – Set the piston to top dead center. This can be checked through the spark plug hole. MS 271 C, MS 291 C...

  • Page 36: Vacuum Test

    (3) indicates a pressure of 0.5 bar. If this pressure remains constant for at least 20 seconds, the engine is airtight. : Connect hose (1) of pump 0000 850 1300 to the nipple (arrow). MS 271 C, MS 291 C...

  • Page 37: Oil Seals

    : Fit the installing sleeve (1) 1141 893 4600. : Slip the oil seal (2), support ring facing outwards, over the installing sleeve. – Remove the installing sleeve (1). Take care not to damage the crankshaft stub. MS 271 C, MS 291 C...

  • Page 38: Shroud

    "AS" facing the engine housing. – Pull out the oil seal. : Use press sleeve (1) 1141 893 2401 to install the oil seal (2). The seating face must be flat and free from burrs. MS 271 C, MS 291 C...

  • Page 39: Cylinder / Crankshaft

    If the sealing faces are damaged, replace the part concerned, b 3.7. : Remove the retaining ring (1). – Remove the shroud, b 6.4 – Pull off the boot and unscrew the spark plug, b 4 MS 271 C, MS 291 C...
  • Page 40 3.7 : Fit the manifold (1) in position. : Take out the screws (2). : Insert and tighten down the : Remove the intake manifold (1). screws (2) firmly. MS 271 C, MS 291 C...
  • Page 41 : Line up the oil seal (3) at the : Push home the cylinder (1) as far ignition side so that it butts as stop and hold it there. against the shoulder (arrows) on the engine pan (2). MS 271 C, MS 291 C...

  • Page 42: Crankshaft / Bearings

    Heated ball bearings must be straight crankshaft stub (ignition installed quickly because the side) as far as stop. crankshaft stubs absorb heat and expand. : Pull out the needle cage (1), check it and replace if necessary. MS 271 C, MS 291 C...

  • Page 43: Piston

    : Lubricate the needle cage (1) with oil and push it into the connecting rod. : Use a suitable tool to grip the hookless snap ring at the recess (arrow) and ease it out. MS 271 C, MS 291 C...
  • Page 44 Fit the snap ring (1) so that its The inner pin (1) must point towards gap (arrow) is on the piston's the flat face (2) of the tool's shank. vertical axis (it must point up). MS 271 C, MS 291 C...

  • Page 45: Piston Rings

    (arrows). clean. – Install the piston, b 6.7 – Reassemble all other parts in the reverse sequence. : Position the new piston rings so that the radii face upward (arrows). MS 271 C, MS 291 C...

  • Page 46: Ignition System

    (after checking that – Check the spark plug boot and wiring and stop switch are in good replace if necessary, b 7.5 – Remove the preseparator, b 7.2 condition). – Troubleshooting, b 3.5 MS 271 C, MS 291 C...
  • Page 47 (1) press the ignition lead (2) into the 1111 890 6400 between the arms guides (arrows). of the ignition module and the flywheel magnet. – Reassemble all other parts in the reverse sequence. MS 271 C, MS 291 C...

  • Page 48: Testing The

    – Crank the engine quickly with the rewind starter and check spark in the tester’s window (2). The engine may start and accelerate during the test. If a spark is visible, the ignition system is in order. MS 271 C, MS 291 C...

  • Page 49: Spark Plug Boot / Ignition Lead

    – Unhook the leg spring from the ignition lead. – Pull the boot off the ignition lead. : Unscrew the flywheel nut (1). MS 271 C, MS 291 C...

  • Page 50: Short Circuit Wire

    Replace flywheel if necessary. – If no fault can be found, check the ignition system with the aid of the troubleshooting chart, b 7.8 – Reassemble in the reverse sequence. MS 271 C, MS 291 C...

  • Page 51: Removing And Installing

    : Pull the ring terminal (1) off the peg (arrow). : Take out the screw and remove the ground wire (2). : Remove the switch shaft (2). – Remove the filter base, b 12.3 MS 271 C, MS 291 C...
  • Page 52 (arrows). – Install the carburetor carrier, b 12.8 – Install the carburetor, b 12.5 – Use STIHL press fluid to simplify assembly, b 14 Ground wire: Crimped side of : Push the rubber grommet (1) into terminal (1) must face the screw the bore in the engine housing (2) head (2).

  • Page 53: Ground Wire

    (2). : Carefully turn the filter base (1) until the seat of the contact spring (2) is visible. : Push the short circuit wire (1) into the guides (arrows). MS 271 C, MS 291 C...
  • Page 54 – Install the switch shaft and check operation, b 10.1 : Lift the contact spring (1) a little and ease it over the bead (arrow). : Push the contact spring (1) into its seat as far as stop. MS 271 C, MS 291 C...

  • Page 55: Ignition System Troubleshooting

    – If necessary, install new spark plug boot and/ or leg spring, b 7.5 Test ignition system: with ZAT 3 or ZAT 4 (use ZAT 3 as main spark gap see TI 32.94), b 7.4 MS 271 C, MS 291 C...
  • Page 56 1.5 – 12 kΩ – Check resistance of ignition lead (spark plug boot and ignition module removed) Spec.: < 10 Ω, If necessary, install new spark plug boot and/or ignition module, b 7.5 MS 271 C, MS 291 C...
  • Page 57 Engine runs Machine runs trouble-free, – Look for fault in fuel system or no further action necessary carburetor – Check engine for leaks – Check position of flywheel on crankshaft, b 6.2, b 7.6 MS 271 C, MS 291 C...

  • Page 58: Rewind Starter

    – Lift the hand guard a little and fit the fan housing in position. : Fit the sleeve (1), insert and tighten down the screws (arrows) firmly. – Reassemble all other parts in the reverse sequence. MS 271 C, MS 291 C...

  • Page 59: Pawls

    (1), b 14 spring loop – the pawl moves outwards. – Reassemble all other parts in the reverse sequence. – Reassemble all other parts in the reverse sequence. MS 271 C, MS 291 C...

  • Page 60: Ergostart

    : Fit the pawls (1) so that they can the torsion springs. move towards the center of the flywheel as far as stop (arrow). – Clean the seats of the pawls (1), b 14 : Fit the E-clips (2). MS 271 C, MS 291 C...

  • Page 61: Rope Rotor

    (arrow) engages the recess (1). – Remove the spring clip and pawl(s), b 8.3 The recess in the hub of the rope rotor is the anchor point for the spring. – Fit the cover washer. MS 271 C, MS 291 C...
  • Page 62 : Pull the rope (1) back into the the grip (small arrow). of the starter grip. rotor until the knot locates in the recess (arrow). – Tension the rewind spring, b 8.7 – Reassemble all other parts in the reverse sequence. MS 271 C, MS 291 C...

  • Page 63: Tensioning The Rewind Spring

    : Pull out the twisted rope (1) with Pull the rope out, hold the rope rotor the starter grip and straighten it steady and take off one turn of the out. rope. – Reassemble all other parts in the reverse sequence. MS 271 C, MS 291 C...
  • Page 64 – Secure the spring so that it cannot pop out. – Install the rope rotor, b 8.5 – Reassemble all other parts in the reverse sequence. MS 271 C, MS 291 C...
  • Page 65 – Secure the spring so that it cannot pop out. – Install the rope rotor, b 8.5 – Reassemble all other parts in the reverse sequence. MS 271 C, MS 291 C...

  • Page 66: Servicing The Av System

    : Screw the AV spring (1) into the replace if necessary. handlebar (arrow) as far as stop. – Reassemble all other parts in the reverse sequence. – Use STIHL press fluid to simplify assembly, b 14 MS 271 C, MS 291 C...

  • Page 67: Handlebar

    : Insert and tighten down the disconnect the retainer (arrow). screws (1) firmly. : Unscrew the spring (2) and pull – Reassemble all other parts in the the retainer (arrow) out of the reverse sequence. handlebar. MS 271 C, MS 291 C...

  • Page 68: Stop Buffer At Clutch Side

    : Push the air guide shroud (2) in engine housing. facing the engine housing. direction of rear handle. – Use STIHL press fluid to simplify – Use STIHL press fluid to simplify : Insert and tighten down the assembly, b 14 assembly, b 14 screw (3) firmly.

  • Page 69: Buffers On Filter Base

    : Insert and tighten down the bores. screw (1) firmly. : Take out the screw (1). – Use STIHL press fluid to simplify – Reassemble all other parts in the assembly, b 14 reverse sequence. : Press the tank housing (2) down a little and hold it there.
  • Page 70 : Insert and tighten down the and take it out of the guide screws (1) firmly. (arrow). – Reassemble all other parts in the reverse sequence. : Push the AV spring (1) into its seat (2). MS 271 C, MS 291 C...

  • Page 71: Control Levers

    : Push the switch lever (1) onto the from the switch lever, b 7.7.2 filter base's pivot pin (2) until it snaps into position. : Remove the switch lever (2), check it and replace if necessary. MS 271 C, MS 291 C...
  • Page 72 : Push the lockout lever (2) into its mounts (arrow). : Rotate the lockout lever (1) in direction of carburetor until it is vertical and then take it out of its mounts (arrows). MS 271 C, MS 291 C...

  • Page 73: Throttle Trigger/Lockout Lever - Quickstop Super

    – Inspect the throttle trigger and : Engage tabs (2) of handle torsion spring, replace as molding (1) in the necessary. openings (arrow). – Push down the handle molding (1) until it snaps into position. MS 271 C, MS 291 C...

  • Page 74: Switch Lever - Quickstop Super

    Brake cable must be in the handle housing guide below the drift – take care not to damage the brake cable. : Use a drift (2) to center the throttle trigger (1). MS 271 C, MS 291 C...

  • Page 75: Lockout Lever - Quickstop Super

    – Check operation of switch lever – Reassemble all other parts in the – Inspect the lockout lever, throttle by operating the lockout lever. reverse sequence. trigger and bushing, replace as necessary. – Check operation. MS 271 C, MS 291 C...

  • Page 76: Choke Rod

    : Engage the choke rod (1) in the bore (arrow) in the choke : Pry the throttle rod (1) out of the shaft (2). : Pry the filter base (1) out of the carburetor carrier (2). buffer (2). MS 271 C, MS 291 C...
  • Page 77 : Pass the throttle rod (1) through the opening (arrow). – Check the throttle rod and replace if necessary : Turn the bent end (1) clockwise and push it under the throttle trigger in the direction of the engine. MS 271 C, MS 291 C...

  • Page 78: Chain Lubrication

    – Pull off the pickup body (1), : Remove the shim (1). check it and replace if necessary. – Reassemble in the reverse sequence. – Push the oil suction hose (1), pickup body first, through the housing bore (arrow). MS 271 C, MS 291 C...
  • Page 79 "TOP" (arrow) faces outwards. – Reassemble all other parts in the reverse sequence. : Pull the oil pump (1) off the oil suction hose (2). – Check the oil pump (1) and replace it if necessary MS 271 C, MS 291 C...

  • Page 80: Valve

    : Installed depth of new valve: a = 1 mm +/- 0.1. – Reassemble all other parts in the reverse sequence. : Remove the old valve (1) from the oil tank. MS 271 C, MS 291 C...

  • Page 81: Fuel System

    : Turn the filter base (1) in direction of ignition side. : Disengage the filter base (1) from the buffer (2). – Remove the contact spring, b 7.7.4 : Push the short circuit wire (1) out through the opening (arrow). MS 271 C, MS 291 C...
  • Page 82 – Check the buffers (1) and replace : Push the short short circuit (1) – Use STIHL press fluid to simplify if necessary, b 9.4.2 through the opening (arrow). assembly, b 14 : Engage the filter base (1) in the Installing buffer (2).

  • Page 83: Air Guide Shroud

    (2). : Pull the fuel return hose (2) out of the guides (arrows). – Place the air guide shroud (1) in position. : Insert and tighten down the screw (2) firmly. MS 271 C, MS 291 C...
  • Page 84 : Push the connector (1) with fuel return hose (2) into the fuel return hose (3) so that the contours (arrows) are in alignment. MS 271 C, MS 291 C...

  • Page 85: Carburetor

    – Check the components and the tank cap is open. replace as necessary. : Remove the carburetor (1). – Check the carburetor and service or replace if necessary. : Push the carburetor (1) onto the studs (arrows). MS 271 C, MS 291 C...

  • Page 86: Leakage Test

    – Install the filter base, b 12.3 – Install the air filter, b 12.1 – Check operation. – Reassemble all other parts in the – Push the pressure hose of pump reverse sequence. 0000 850 1300 onto the nipple. MS 271 C, MS 291 C...

  • Page 87: Servicing The Carburetor

    : Check the sealing ring (arrow) replaced. and replace it if necessary – Check the metering diaphragm for signs of damage and wear. Install a new gasket. MS 271 C, MS 291 C...

  • Page 88: Pump Diaphragm

    (2) on the body. Clean or replace the fuel spring (arrow) first, then slide the strainer. inlet control lever’s clevis into the groove in the inlet needle (1). – Reassemble in the reverse sequence. MS 271 C, MS 291 C...

  • Page 89: Levers On Throttle Shaft

    : Position the end cover (1) so that the contour (arrow) points in the direction of the throttle and choke shaft levers. : Take out the screw (1). : Pull off the lever (2). MS 271 C, MS 291 C...

  • Page 90: Adjusting Screws

    – take care not to damage the – left-hand thread. high speed screw (H). Do not turn the puller any further – the high speed screw (H) may otherwise be damaged. : Take out the low speed screw L (1). MS 271 C, MS 291 C...

  • Page 91: Adjusting The Carburetor

    The carburetor, air filter and as the first detent (arrow) grommet are installed, the adjusting – do not push fully home. screws fitted and the new limiter cap pre-installed. – Check chain tension and adjust if necessary. MS 271 C, MS 291 C...
  • Page 92 3. Use the idle speed screw (LA) cap (1) is recessed 2 mm in the to set the engine speed again to carburetor body. 3,300 rpm. 4. Use the low speed screw (L) to set engine speed to 2,800 rpm. MS 271 C, MS 291 C...

  • Page 93: Standard Setting

    (L). a 3/4 turn. : Remove the shim (1). – Turn the low speed screw (L) slowly clockwise as far as stop, then turn it back 1 full turn. MS 271 C, MS 291 C...
  • Page 94 (arrows) hose (1) fully into its seat (arrow). locate against the studs (2). : Remove the fuel hose (1) from the guides (arrows) – take care not to stretch the hose. MS 271 C, MS 291 C...

  • Page 95: Intake Manifold

    – Reassemble all other parts in the engine running problems, b 3.7 b 12.4 reverse sequence. Models with manual fuel pump, b 12.4.1 – Install the carburetor carrier, b 12.8 – Reassemble all other parts in the reverse sequence. MS 271 C, MS 291 C...

  • Page 96: Tank Vent

    (2) 1108 893 4800 to 0000 850 1300 to the maintain the gap. nipple (arrow) – pressurize the fuel tank. : Use a suitable plug (2) to seal the fuel suction hose (1). MS 271 C, MS 291 C...

  • Page 97: Fuel Intake

    : Pull off the pickup body (1), first. check it and replace if necessary. – Reassemble in the reverse sequence. : Take out the screws (1). MS 271 C, MS 291 C...
  • Page 98 – Remove the chain brake cover, b 5.2 : Pull the connector (1) off the fuel hose (2). – Use STIHL press fluid to simplify assembly, b 14 – Remove the pickup body, : Pry out the stop buffer (1) at the b 12.11.1...
  • Page 99 (arrows). : Position the fuel hose (1) so that it is on the right of the brake cable (2) – as shown in the illustration. : Insert and tighten down the screw (1) firmly. MS 271 C, MS 291 C...

  • Page 100: Fuel Hose - Models With Manual Fuel Pump

    – Open the tank cap. necessary. – Remove the carburetor carrier, b 12.8 : Position the stop buffer (1) – Lower the tank housing, b 5.4.2 with its tapered end facing the engine housing. MS 271 C, MS 291 C...
  • Page 101 12.11.2 : Press out the fuel return hose (1) : Pry out the grommet (1). in direction of tank housing. – Use STIHL press fluid to simplify – Replace the fuel return hose. assembly, b 14 Check the connector and grommet and replace if necessary.
  • Page 102 – Install the tank housing, : Tie a thin piece of string (1), b 12.11.5 about 25 cm long, around the flange (arrow) of the fuel return – Install the carburetor carrier, hose. b 12.8 MS 271 C, MS 291 C...

  • Page 103: Manual Fuel Pump

    – Reassemble all other parts in the reverse sequence. : Fit the fuel return hose (1) behind the carburetor carrier (2) and push it onto the fuel pump's nipple (arrow) as far as stop. MS 271 C, MS 291 C...

  • Page 104: Tank Housing

    – Remove the stop buffer, b 9.4 – Remove the control levers, b 10 : Press out the fuel return hose (1) in direction of tank housing. – Lower the tank housing a little, b 12.11.2 MS 271 C, MS 291 C...
  • Page 105 : Slide the tank housing (1), narrow part (2) first, into the engine housing. : Thread the ends of the string (1) through the bore (arrow). : Pull the fuel return hose (2) into the engine housing. MS 271 C, MS 291 C...
  • Page 106 (2) is inside the bore (arrow). – Install the handlebar, b 9.5 : Lift the tank housing (2). : Insert and tighten down the screw (1) firmly. MS 271 C, MS 291 C...

  • Page 107: Special Servicing Tools

    5910 850 4503 Testing ignition system Ignition system tester, ZAT 3 5910 850 4520 Testing ignition system Torque wrench 5910 890 0302 0.5 to 18 Nm Torque wrench 5910 890 0312 6 to 80 Nm MS 271 C, MS 291 C...
  • Page 108 Removing oil seal(s) Stud puller M8 5910 893 0501 Removing bar mounting studs Setting disk 5910 893 6600 Add-on for screwdriver (adjusting carburetor) Hook 5910 893 8800 Removing pickup body Remarks: 1) Use for releasing only. MS 271 C, MS 291 C...

  • Page 109: Servicing Aids

    0786 111 2101 adhesive (Loctite 242) High-strength threadlocking 0786 111 2109 adhesive (Loctite 270) Standard commercial solvent- Cleaning sealing faces and carburetor, based degreasant containing no crankshaft stubs and flywheel taper chlorinated or halogenated hydrocarbons MS 271 C, MS 291 C...
  • Page 110 englisch / english 0455 574 0123. M1,15. B11. FST. Printed in Germany...

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