Stihl MS 650 Manual
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Stihl MS 650 Manual

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STIH)
STIHL MS 650, 660
2007-09

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Summary of Contents for Stihl MS 650

  • Page 1 STIH) STIHL MS 650, 660 2007-09...

  • Page 2: Table Of Contents

    12.3.6 Removing and Installing Installing the Choke Shaft Pawls Rope Rotor Starter Rope / Grip Tensioning the Rewind Spring Segment Starter Rope Guide Bushing Replacing the Rewind Spring © ANDREAS STIHL AG & Co. KG, 2007 MS 650, MS 660...
  • Page 3 Heating Element in Front Handle 14.5 Generator 14.5.1 Troubleshooting Chart 99 14.5.2 Test Connections and Test Values Wiring Harness 15.1 Standard Wiring Harness 15.2 Wiring Harness with Handle and Carburetor Heating Special Servicing Tools Servicing Aids MS 650, MS 660...

  • Page 4: Introduction

    Use the part numbers to identify the tools in the "STIHL As the design concept of models Special Tools" manual which lists all MS 650 and MS 660 is almost the special servicing tools currently identical, the descriptions and available from STIHL.

  • Page 5: Safety Precautions

    Do not bring any fire, flame, spark or other source of heat near the fuel. All work with fuel must be performed outdoors only. Spilled fuel must be wiped away immediately. MS 650, MS 660...

  • Page 6: Specifications

    0.15 – 0.3 mm Spark plug (suppressed): Bosch WSR 6 F NGK BPMR 7 A Electrode gap: 0.5 mm Chain Lubrication Fully automatic, speed-controlled oil pump with rotary piston Oil delivery rate: 5.5 – 15 cm at 10,000 rpm MS 650, MS 660...

  • Page 7: Tightening Torques

    Chain catcher/spiked bumper (with wrap-around handle) Screw IS-M5x20 Chain catcher/spiked bumper/ crankcase Screw M5x12 Spiked bumper/crankcase, top with nut Screw IS-M5 Chain sprocket cover/spiked bumper Screw IS-M5x20 Crankcase/oil tank housing 11.5 Remarks: 1) Loctite 243, medium strength MS 650, MS 660...
  • Page 8 Power screwdriver setting for polymer: DG and P screws max. 500 rpm Do not use an impact screwdriver for releasing or tightening screwed assemblies. Do not mix up screws with and without binding heads. MS 650, MS 660...

  • Page 9: Troubleshooting Chart

    Install new clutch Chain sprocket wears rapidly Chain not properly tensioned Tension chain as specified Wrong chain pitch Fit chain of correct pitch Insufficient chain lubrication Check chain lubrication Chain sprocket worn Fit new chain sprocket MS 650, MS 660...
  • Page 10 Saw chain does not stop Brake spring stretched or broken Fit new brake spring immediately when brake is activated Brake band stretched, worn or Fit new brake band broken Clutch drum worn Fit new clutch drum MS 650, MS 660...

  • Page 11: Rewind Starter

    Coat rewind spring with a little becomes viscous at very low standard solvent-based degreasant outside temperatures (spring (containing no chlorinated or windings stick together) halogenated hydrocarbons), then pull rope carefully several times until normal action is restored MS 650, MS 660...

  • Page 12: Chain Lubrication

    Adjusting screw and/or control Fit new adjusting screw and/or oil edge on pump piston worn pump Intake hose or pickup body clogged Clean or replace intake hose/ pickup body Oil pump worn Install new oil pump MS 650, MS 660...

  • Page 13: Ignition System

    Weak magnetization in flywheel – Install new flywheel pole shoes have turned blue Crankcase damaged (cracks) Replace crankcase No spark Faulty Master Control lever or Check operation of Master Control ignition module lever and ignition module MS 650, MS 660...
  • Page 14 Check operation of spark plug. Clean or replace spark plug, Inspect Master Control lever, replace faulty parts of ignition ignition coil/lead for damaged system insulation and leakage current MS 650, MS 660...

  • Page 15: Carburetor

    Inlet needle sticking to valve seat Remove inlet needle, clean and refit Diaphragm gasket leaking Fit new diaphragm gasket Metering diaphragm damaged or Fit new metering diaphragm shrunk Impulse hose damaged or kinked Fit new impulse hose MS 650, MS 660...
  • Page 16 Setting of idle speed incorrect – Set idle speed screw (LA) throttle shutter completely closed correctly Small plastic plate in valve jet Clean or renew valve jet does not close Idle jet bores or ports blocked Clean the carburetor MS 650, MS 660...
  • Page 17 Rotate high speed screw (H) too rich clockwise (leaner), no further than stop Main jet bores or ports blocked Clean the carburetor Pump diaphragm damaged or Fit new pump diaphragm fatigued Impulse hose damaged or kinked Fit new impulse hose MS 650, MS 660...

  • Page 18: Engine

    Decompression valve sticking Replace the decompression valve Engine overheating Insufficient cylinder cooling. Air Thoroughly clean all cooling air inlets in fan housing blocked or openings and the cylinder fins cooling fins on cylinder very dirty MS 650, MS 660...

  • Page 19: Clutch, Chain Drive, Chain Brake And Chain Tensioner

    : Remove the rim sprocket (1). : Disengage the chain brake by : Remove the clutch drum (1) with pulling the hand guard towards needle cage (2). the front handle. – Examine the needle cage for signs of damage. MS 650, MS 660...

  • Page 20: Replacing The

    – b 5 cover, chain and bar – b 5 and replace if necessary. Lubricate needle cage with STIHL multi- : Take out the screw (1). : Hold the self-locking nut steady purpose grease – b 17.

  • Page 21: Clutch

    0000 893 5903 into the spark plug hole so that "OBEN-TOP" faces up. Disassembling the clutch : Pull off the air baffle (1) upwards. : Use hook (2) 5910 890 2800 to remove the clutch springs (1). MS 650, MS 660...
  • Page 22 : Clamp the clutch in a vise. – Replace any damaged parts. Assembling the clutch : Slip the retainers onto the clutch : Fit the cover washer (1) on the shoes. crankshaft so that its raised center (arrow) faces outwards. MS 650, MS 660...

  • Page 23: Chain Brake

    The braking time is in order if deceleration of the saw chain is imperceptible to the eye. If the chain brake does not operate properly, see troubleshooting chart – b 4.1. : Take out the screws (arrows). : Remove the cover. MS 650, MS 660...
  • Page 24 : Disconnect the brake band (1) from the brake lever (2). : Take out the screw (arrow). : Disconnect the spring (1). : Remove the E-clip (3). : Remove the lever (2) with spring (1). MS 650, MS 660...

  • Page 25: Installing

    Turn pin back and forth as necessary. – Remove the cylinder – b 6.5.1 : Use a suitable punch to drive the anchor pin (1) out of the crankcase, from the inside outwards. MS 650, MS 660...
  • Page 26 Coat all sliding and bearing points with STIHL multipurpose grease – b 17. Do not lubricate the brake band. : Carefully tap home the pin : Insert the lever in the side of the squarely to obtain dimension "a" hand guard bearing boss.
  • Page 27 – Place cover in position. : Insert screws (arrows) and tighten them down firmly – b 3.5 – Install the clutch drum/chain sprocket – b 5.1 : Hook the brake spring (1) to the brake lever (2). MS 650, MS 660...

  • Page 28: Chain Tensioner

    : Take out the tensioner slide with : When reassembling, check that adjusting screw and thrust pad. O-ring (arrow) is fitted in spur : Take out the screw (2). gear and coat it with oil before fitting the spur gear. MS 650, MS 660...

  • Page 29: Bar Mounting Studs

    (2) and clean or replace if necessary. All machines : Take out the screws (arrows). : Take out the screws (arrows). – Remove the top casing. – Remove the bottom casing. – Remove the gasket (if fitted). MS 650, MS 660...

  • Page 30: Shroud

    (arrow) is properly Lower mounting screws are seated on the decompression M6x20 and the upper mounting valve. are M5x6. – Fit the top casing. – Tighten down the screws firmly – b 3.5 MS 650, MS 660...

  • Page 31: Leakage Test

    – Set the piston to top dead center. This can be checked through the inlet port. : Back off the bottom casing : Check that the sleeve (1) and screws (arrows) half way – washer (2) are in place. b 6.1 MS 650, MS 660...

  • Page 32: Vacuum Test

    : When fitting the test flange, make vacuum pump 0000 850 3501 to sure the pin locates properly in nipple (arrow) of the test flange. the impulse hose (2). : Fit the nuts (3) and tighten them down firmly. MS 650, MS 660...

  • Page 33: Pressure Test

    (arrow) indicates a pressure of screws (1). 0.5 bar. If this pressure remains constant for at least 20 seconds, : Remove the generator (2). the crankcase is airtight. MS 650, MS 660...
  • Page 34 – b 17 b 17 – Slip the oil seal, open side facing Clutch side the crankcase, over the crankshaft stub. – Remove the clutch drum – b 5.1 – Remove the oil pump – b 11.3.1 MS 650, MS 660...

  • Page 35: Cylinder And Piston

    : Slip the oil seal, open side facing the crankcase, over the crankshaft stub. – Remove the installing sleeve. : Take the sleeve (1) out of the manifold. : Remove the washer (2). MS 650, MS 660...
  • Page 36 – Remove the cylinder gasket from the crankcase. – Inspect the piston rings and replace if necessary – b 6.6 : Carefully separate the cylinder gasket from the cylinder base. – Pull the cylinder off the piston. MS 650, MS 660...

  • Page 37: Installing

    1111 893 4700, small diameter magnet (2) so that the snap ring first, through the piston and small gap is on the flat side of the tool's end (needle cage) and line up the shank. piston. MS 650, MS 660...
  • Page 38 (they must point either up or Inner pin must again point toward down – see arrow). : Pay attention to the correct flat face. installed position (arrow). MS 650, MS 660...
  • Page 39 : Line up cylinder as it will be in the : Insert the cylinder base screws installed condition. It is important (arrows), but do not tighten them to observe this point as the piston down yet. rings might otherwise break. MS 650, MS 660...

  • Page 40: Piston Rings

    : Install the new piston rings in the screws in an alternate pattern – grooves so that the radii at the b 3.5 ends of the rings face upward. – Install the piston – b 6.5.2 MS 650, MS 660...

  • Page 41: Crankcase/Crankshaft

    – Remove the chain brake – b 5.5.2 – Remove the clutch – b 5.4 – Remove the muffler –, b 6.1 – Remove the oil pump – b 11.3.1 : Pull the impulse hose off the connector (arrow). MS 650, MS 660...
  • Page 42 : Fit three M5x72 screws (arrows) in the holes marked “11“ and tighten them down against the drilled plate. – Take the heat reflecting foil off the crankcase. : Remove the screws (arrows) from the two halves of the crankcase. MS 650, MS 660...
  • Page 43 Check the condition of all other parts, replace if necessary and transfer to the new crankcase. If only the ball bearings are replaced, all rubber and polymer components, such as oil suction hose and annular buffers, may be left in position. MS 650, MS 660...

  • Page 44: Installing The 11. Crankshaft

    : If it is not possible to heat the position. If necessary, drive them flywheel side of the crankcase, into the flywheel half of the use press arbor (1) crankcase. 1124 893 7200 to press home the ball bearing as far as stop. MS 650, MS 660...
  • Page 45 : Push the annular buffer home so that its annular groove (1) engages the housing rib (2). : Place tapered stub of crankshaft in ball bearing at the flywheel side of the crankcase. MS 650, MS 660...
  • Page 46 – Fit bar mounting studs at clutch side – b 5.7 : Turn the spindle clockwise until the crankshaft locates against the ball bearing. The connecting rod must point toward the cylinder flange while the crankshaft is being installed. MS 650, MS 660...
  • Page 47 – Take out the two M5x72 screws. – Fit the hex nuts (for chain sprocket cover) on the collar studs and screw them down finger-tight. : Fit the screws (arrows) and tighten them down firmly in an alternate pattern – b 3.5 MS 650, MS 660...

  • Page 48: Decompression Valve

    – b 3.5 : Fit the cover (1). – Fit the shroud – b 6.2 : Stick the heating reflecting foil in position, without creases, so that it covers the housing wall at the clutch side. MS 650, MS 660...

  • Page 49: Ignition System

    A new ignition module must be installed if no ignition spark is obtained (after checking that wiring and stop switch are in good condition) The electronic (breakerless) ignition system basically consists of an ignition module (1) and flywheel (2). MS 650, MS 660...

  • Page 50: Removing And Installing

    : Rotate the flywheel until the “N” carburetor heating, position the mark (arrow) is in line with the top wire (1) under the ignition of the ignition module. module. : Push the wire (2) into the wire retainer (arrow). MS 650, MS 660...

  • Page 51: Testing The Ignition Module

    : Attach ground terminal (1) to the : Push the tester’s output spark plug. terminal (3) onto the spark plug. : Use adjusting knob (3) to set – Set the Master Control lever spark gap to about 2 mm. to “#“ MS 650, MS 660...

  • Page 52: Spark Plug Boot

    (3), check the ignition system with the aid of the troubleshooting chart – b 7.6. : Pull the cover off the spark plug : Pinch the hook of the leg spring boot. into the center of the lead (arrow). MS 650, MS 660...

  • Page 53: Flywheel

    : Use a pointed tool to pierce the : Back off the thrust bolt (1) of center of the other end of the puller (2) 1106 890 4501. ignition lead which screws into the module. : Screw puller into the flywheel (3). MS 650, MS 660...

  • Page 54: Installing

    (1). Inspect flywheel and magnet poles for signs of damage or blue discoloration. If you find any damage, install a new flywheel. : Pry the contact spring (1) downwards off the pin and remove it sideways. MS 650, MS 660...

  • Page 55: Wiring Harness

    The resistance measured must be infinitely high. If not, fit a new short circuit wire. If no fault can be found, carry out further checks: : Pull the front end of the contact upwards onto the cam. MS 650, MS 660...

  • Page 56: Ignition System Troubleshooting

    – Leg spring hook in center of ignition lead? – Boot damaged? If necessary, install new spark plug boot and/or leg spring Test ignition system with ZAT 3 or ZAT 4 (use ZAT 3 as main spark gap – see TI 32.94) MS 650, MS 660...
  • Page 57 – Spark plug boot: Holes/cracks? – Resistance: spark plug boot to ground: spec. 1.5 – 12kΩ – Check resistance of ignition lead: spec. < 10 Ω, –If necessary, install new spark plug boot and/or ignition lead MS 650, MS 660...
  • Page 58 – Re-connect short circuit wire Powerful spark? Install new ignition module Engine runs Check “#“/“$“ function Look for fault in fuel system on Master Control or carburetor, lever check engine for leaks, check position of flywheel on crankshaft MS 650, MS 660...

  • Page 59: Rewind Starter

    Before installing, lubricate the b 3.5 rewind spring and starter post with : Pull the pawls (1 + 2) out of the STIHL special lubricant – b 17. rope rotor. – Lubricate pegs of new pawls with grease – b 17 Reassemble in the reverse sequence.

  • Page 60: Rope Rotor

    – Tension the rewind spring – b 8.6 : Remove the washer (1) from the : Thread the new starter rope starter post. through the top of the starter grip. – Carefully pull the rope rotor off the starter post. MS 650, MS 660...

  • Page 61: Tensioning

    : Grip the rope next to the rotor and overhand knot. use it to turn the rope rotor six times clockwise. : Pull rope back until knot locates in recess (arrow) in rope rotor. – Tension the rewind spring – b 8.6 MS 650, MS 660...

  • Page 62: Segment

    – Install the fan housing with installing tool 0000 890 2201 rewind starter – b 8.2 : Engage tabs (1) in the slots through the bushing from inside (arrows). the fan housing. Reassemble all other parts in the reverse sequence. MS 650, MS 660...

  • Page 63: Replacing The Rewind Spring

    Installing end first, and the hex nut. – Lubricate the spring with a few : Tighten down the hex nut until the drops of STIHL special lubricant bushing is firmly seated. before installation –b 17 : Position replacement spring with frame (1) in the fan housing.

  • Page 64: Av System

    – Install the rope rotor – b 8.4 – Tension the rewind spring – b 8.6 Reassemble all other parts in the reverse sequence. : Pry the annular buffers (arrows) out of the crankcase. MS 650, MS 660...

  • Page 65: Tank Housing

    : Pry the annular buffers (1) out of from outside so that its groove (1) the crankcase. engages the housing rib (2). Reassemble all other parts in the reverse sequence. Note: Coat annular buffers with STIHL Press Fluid before installing. MS 650, MS 660...

  • Page 66: Master Control / Handle System

    : Carefully swing the left end of the switch shaft (1) upwards and pull it out of the retainer (2). – Pull the retainer out of its guide. : Take out the screw (1). – Remove the handle molding (2). MS 650, MS 660...

  • Page 67: Throttle Trigger / Interlock Lever

    Reassemble all other parts in the reverse sequence. : Pull the throttle rod (1) sideways out of the trigger (2). – Move the Master Control to the “RUN“ position. : Engine the retainer (1). : Remove the interlock lever (1). MS 650, MS 660...

  • Page 68: Front Handle

    : Fit the interlock lever (1) so that it : Position the handle molding so engages the throttle trigger (2) that its front edge (arrow) when operated (arrow). engages the frame (1). Reassemble all other parts in the reverse sequence. MS 650, MS 660...

  • Page 69: Chain Lubrication

    Suction Hose – Remove the clutch – b 5.4 – Remove the oil pump – b 11.3.1 : Pull the pickup body (1) off the suction hose (2). MS 650, MS 660...

  • Page 70: Valve

    (from outside to inside of tank). – Flush out the oil tank. Reassemble in the reverse sequence. : Carefully insert the new valve in the housing bore from outside. Check the correct installed position. MS 650, MS 660...

  • Page 71: Oil Pump

    – Coat oil pump screws with Hylomar sealant – b 17 Reassemble in the reverse sequence. : Take the drive spring off the worm. : Take out the screws (1). – Pull off the oil pump. MS 650, MS 660...

  • Page 72: 11.3.2 Servicing

    : Pull out the control bolt (2). – In case of stubborn dirt, wash all : Remove the O-rings (3). parts of the filter in STIHL universal cleaner or a fresh, non- : Pry out the plug (4). flammable cleaning solution (e.g.

  • Page 73: Carburetor

    If filter mesh is damaged, install a new filter base. Reassemble in the reverse sequence. Machines with carburetor heating : Remove the baffle plate (1). MS 650, MS 660...
  • Page 74 (1) is correctly seated. : Connect the fuel hose (2). : Remove the carburetor. : Squeeze the throttle trigger and hook the rod (2) to the throttle Reassemble in the reverse shaft (1). sequence. MS 650, MS 660...

  • Page 75: 12.2.2 Leakage Test

    Reassemble all other parts in the reverse sequence. : Push the fuel line with nipple onto : Carefully separate the diaphragm the carburetor’s elbow connector. and gasket. – Inspect diaphragm for damage and wear and replace if necessary. MS 650, MS 660...

  • Page 76: 12.3.2 Inlet Needle

    The cast pegs (1) hold the gasket in position. : If there is an annular indentation (arrow) on the sealing cone of the inlet needle, fit a new inlet needle. Reassemble in the reverse sequence. MS 650, MS 660...

  • Page 77: 12.3.3 Fixed Jet

    – Install the metering diaphragm – b 12.3.1 Reassemble all other parts in the reverse sequence. : Carefully separate the diaphragm and gasket. – Inspect diaphragm for damage and wear, install a new gasket. MS 650, MS 660...

  • Page 78: Removing And Installing The Throttle Shaft

    : Carefully pull the throttle shutter out of the shaft. Reassemble in the reverse sequence. : Unscrew the idle speed screw (LA) (1). : In idle position, lever (2) butts against carburetor (arrow). MS 650, MS 660...
  • Page 79 : Push the throttle shaft fully home. – Fit the clip and secure it in position with the screw. – Turn the throttle shaft to the wide open position. – Fit the throttle shutter in the shaft. MS 650, MS 660...

  • Page 80: Removing And Installing The Choke Shaft

    – Rotate choke shaft against spring pressure to the choke position. – Fit the choke shutter. : Remove the E-clip (1). – Pull out the choke shaft. Examine parts for damage an wear and replace if necessary. MS 650, MS 660...

  • Page 81: User Adjustment

    – It is usually necessary to change turn the high speed screw (H) the setting of the idle speed beyond the standard setting to screw (LA) after every correction make the mixture leaner. to the low speed screw (L). MS 650, MS 660...

  • Page 82: Carburetor With Limiter Caps

    Engine stops while idling – Set the low speed screw (L) one quarter turn open. – Turn the idle speed screw (LA) clockwise until the saw chain begins to move. Then turn it back one quarter turn. MS 650, MS 660...

  • Page 83: Basic Setting (Carburetor With Limiter Caps)

    90° to the slot. Align the lug relative to the slot by eye. : Screw puller 5910 890 4500 about 5 turns counterclockwise into the limiter cap. : Pull off the limiter cap. MS 650, MS 660...
  • Page 84 – Warm up the engine. Note: The lug is in line with the slot. On older machines, the limiter cap’s lug is at 90° to the slot. Align the lug relative to the slot by eye. MS 650, MS 660...

  • Page 85: Tank Vent

    13,500 rpm with the high speed screw (H). If the setting is made too lean there is a risk of engine damage due to insufficient lubrication and overheating. 6. Install new limiter caps. : Pull fuel hose (1) off the carburetor. MS 650, MS 660...
  • Page 86 Version with connector and hose the carburetor housing. Reassemble all other parts in the reverse sequence – Test tank for leaks – b 12.6 : Pry off the connector (1). MS 650, MS 660...

  • Page 87: Pickup Body

    Clean the fuel tank if necessary. Tank vent on MS 650 and MS 660 : Remove the grommet (1). from serial # 1 63 264 274 and Cleaning the fuel tank...

  • Page 88: Fuel Hose In Tank

    : Carefully pry the fuel hose out of Before installing, lubricate outside the grommet in the tank. diameter of grommet with Press Fluid OH 723 0781 957 9000 or two-stroke oil. – Test tank for leaks – b 12.6 MS 650, MS 660...

  • Page 89: Separating Crankcase And Tank Housing

    – Replace the crankcase – b 6.7 Note the following points when reassembling. – Remove the ignition module – : Push the manifold flange through b 7.2.1 the housing opening. : Pull connectors (1) out of guide (arrow) and disconnect. MS 650, MS 660...
  • Page 90 1114 893 4700. – Wiring in carburetor housing – b 15 : Pull the ends of string outwards. Check that flange is properly seated in the tank housing. Reassemble all other parts in the reverse sequence. MS 650, MS 660...

  • Page 91: Replacing The Tank Housing

    7.4 carburetor heating system. : Pull tank cap cord (1) out of slot (2). – Remove the tank cap. : Take out the screws (1). – Remove carburetor housing from tank housing. MS 650, MS 660...

  • Page 92: Testing

    “Ω“. If a higher value is indicated, install a new heating element. : Remove the wires from the retainer (arrow). : Push back the insulating tubes (1) and disconnect the pin and socket connectors. MS 650, MS 660...
  • Page 93 8 Ω in measuring range “Ω“. If the reading obtained is outside this tolerance, install a new heating element. Reassemble in the reverse sequence. Make sure the pin and socket connector is straight. MS 650, MS 660...

  • Page 94: Troubleshooting Chart

    Does thermostatic switch Replace thermostatic close between + 13°C (55°F) and switch + 6°C (43°F)? Does thermostatic switch Replace thermostatic open between + 6°C (43°F) and switch above + 13°C (55°F)? Carburetor heating system in order MS 650, MS 660...

  • Page 95: Handle Heating System

    – b 10.2 – Remove the handle molding – b 10.1 : Push back the insulating tube (arrow) on the pin and socket connector of the wire between the generator and rear handle heating element. MS 650, MS 660...

  • Page 96: Heater Switch

    : The washer (4) and hex nut (5) contact spring (2) (arrow). are fitted from outside. – Check freedom of movement of contact spring. : Unscrew the nut (arrow) from the switch. – Remove the washer. MS 650, MS 660...

  • Page 97: Heating Element In

    30 seconds with the heating switched on. – Removing the backing from the new heating element. : Place heating element (1) in handle housing (2) and press firmly and uniformly into position, from the center outwards. MS 650, MS 660...

  • Page 98: Heating Element In Front Handle

    : Pull the wire (arrow) out of the : Take the wire out of the guide insulating tube. (arrow). – Pull the wire into the carburetor : Take out the screws (1). housing. : Remove the generator (2). MS 650, MS 660...
  • Page 99 Reassemble all other parts in the reverse sequence. – Positioning the wiring – b 15.2 : Inspect the magnet ring (arrow) in the flywheel for cracks or other damage. If damage is found, replace the flywheel. Reassemble in the reverse sequence. MS 650, MS 660...

  • Page 100: 14.5.1 Troubleshooting Chart

    Check rear handle heating element In good condition? Bonding OK? Install new rear handle heating element Resistance of rear handle heating element about 1 Ω? Check generator Resistance between engine ground Install new and generator connection generator about 0.5 Ω? MS 650, MS 660...
  • Page 101 Install new (contact sleeve against switch housing) heater switch Closed: about 0 Ω ? Open: Circuit interrupted (On machines with carburetor heating, refit connector pin of wire from heating element in the round plug) System in order MS 650, MS 660...

  • Page 102: 14.5.2 Test Connections And Test Values

    Break in wire, Install new front heating element handle damaged Short circuit – Repair damaged insulation insulation Generator Connector Ground 0.3...1.0 Generator OK on red wire Pull out wire for this purpose MS 650, MS 660...
  • Page 103 Short circuit – Repair damaged insulation insulation Generator Connector Connector 0.8...1.8 Generator OK on yellow on red wire wire Break in wire, Install new generator damaged generator Short circuit – Install new damaged insulation generator MS 650, MS 660...

  • Page 104: Wiring Harness

    – Ease the connector sleeve off the switch shaft – b 10.1 – Remove the carburetor – b 12.2.1 – Remove connector from contact spring – b 7.4 : Position the short circuit wire and ground wire under the impulse hose. MS 650, MS 660...

  • Page 105: Wiring Harness With Handle And Carburetor Heating

    – Pry out the grommet – b 15.1 – Inspect grommet for damage. – Remove the air filter and filter base – b 12.1 : Push back the insulating hose (1) and separate the connectors (2). MS 650, MS 660...
  • Page 106 – Remove wires of front handle (arrow). heating system – b 14.4 Reassemble in the reverse sequence. : Position generator wire (1) in the guide (arrow). : Pull insulating tubes (2) over the wires. MS 650, MS 660...

  • Page 107: Special Servicing Tools

    Socket for torque wrench 17 mm 5910 893 5610 Releasing flywheel Puller 1106 890 4501 Removing flywheel Installing tool 0000 890 2201 Flaring rope guide bushing Installing tool 1116 893 4800 Installing rewind spring Hook 5910 893 8800 Removing pickup body MS 650, MS 660...
  • Page 108 T-handle screwdriver T 27 x 150 5910 890 2400 IS-P screws (4 mm) Pliers, DIN 5254-A 19 0811 611 8380 Removing and installing external circlips Remarks: 1) Use only for releasing P screws. MS 650, MS 660...

  • Page 109: Servicing Aids

    High voltage output on ignition module Medium-strength threadlocking 0786 110 0101 adhesive (Loctite 243) (250 ml bottle) Hylomar sealant 0783 810 1101 Oil pump Standard commercial solvent- Cleaning sealing faces based degreasant containing no chlorinated or halogenated hydrocarbons MS 650, MS 660...
  • Page 110 englisch / english 0455 178 0123. M0. J7. Printed in Germany...

This manual is also suitable for:

Ms 660

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