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CS-501SX
ECHO:
CS-501SXH
501sx
shindaiwa:
(Serial number: 37000001 and after)
(Serial number: 38000001 and after)
Ref. No. 401-42
Copyright C 2019 YAMABIKO Corporation All rights reserved.

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Do you have a question about the shindaiwa CS-501SX and is the answer not in the manual?

Questions and answers

J Peck
March 13, 2025

What fuel to use in this machine

1 comments:
Mr. Anderson
March 13, 2025

The Echo Shindaiwa CS-501SX should use mixed two-stroke fuel with a mixture ratio of 50:1 (2%). The fuel should be a minimum of 89 octane petrol mixed with two-stroke air-cooled engine oil that meets ISO-L-EGD (ISO/CD13738) or JASO FC/FD standards. Premixed alkylate fuel for 2-stroke engines can also be used.

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Summary of Contents for Echo shindaiwa CS-501SX

  • Page 1 CS-501SX ECHO: CS-501SXH 501sx shindaiwa: (Serial number: 37000001 and after) (Serial number: 38000001 and after) Ref. No. 401-42 Copyright C 2019 YAMABIKO Corporation All rights reserved.
  • Page 2 INTRODUCTION This service manual contains information for ser- vice and maintenance of ECHO CHAIN SAW, model CS-501SX,CS-501SXH, shindaiwa CHAIN SAW, model 501sx. For systematic diagnosis, to avoid extra work, time loss and to meet Emission regulation, please refer to “Troubleshooting guide” that describes problems, testing, remedies and references.
  • Page 3: Table Of Contents

    CS-501SX, CS-501SXH 501sx TABLE OF CONTENTS Page Page 1 SERVICE INFORMATION ........2 5 CLUTCH SYSTEM ..........36 Specifi cations ...........2 Inspectng clutch parts ........37 Technical data ..........3 Replacing clutch parts ........38 Torque limits .............4 Installing clutch assembly .......38 Special repairing materials .......4 Service Limits ...........5 6 CHAIN BRAKE SYSTEM ........40 Special tools .............6...
  • Page 4: Service Information

    CS-501SX, CS-501SXH 501sx SERVICE INFORMATION 1 SERVICE INFORMATION 1-1 Specifi cations Models CS-501SX, 501sx CS-501SXH Dimensions Length* mm(in) 395 (15.6) Width mm(in) 235 (9.3) Height mm(in) 290 (11.4) Dry weight* kg(lb) 4.7 (0.2) 4.9 (10.8) Engine Type YAMABIKO, air-cooled, two-stroke, single cylinder Rotation Clockwise as viewed from the output end Displacement...
  • Page 5: Technical Data

    CS-501SX, CS-501SXH 501sx SERVICE INFORMATION 1-2 Technical data Models CS-501SX, 501sx CS-501SXH Engine Compression pressure MPa (kgf/cm ) (psi) 0.95 (9.7) (138) Clutch engagement speed r/min 3,900 Ignition system Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028) Spark test Tester gap w/ spark plug mm(in) 4.0 (0.16)
  • Page 6: Torque Limits

    CS-501SX, CS-501SXH 501sx SERVICE INFORMATION 1-3 Torque limits Descriptions Size kgf•cm N•m in•lbf Starter system Starter pawl Starter case Ignition system Magneto rotor (Flywheel) Ignition coil Igniton switch Spark plug Fuel system Carburetor Carburetor elbow LM10 Clutch Clutch shoe Clutch drum Engine Crankcase Muffler...
  • Page 7: Service Limits

    CS-501SX, CS-501SXH 501sx SERVICE INFORMATION 1-5 Service Limits 5K177 5K083 5K084 5K081 5K082 5K016 5K025 5K178 5K190 5K097 5K097 5K173 5K174 Description mm (in) A Cylinder bore When plating is worn and aluminium can be seen Piston outer diameter Min. 43.
  • Page 8: Special Tools

    CS-501SX, CS-501SXH 501sx SERVICE INFORMATION 1-6 Special tools Part Number Description Reference 897802-33330 Tachometer PET-1000R Measuring engine speed to adjust carburetor 897559-02831 T-hex. wrench (4 mm) Removing and installing hex. socket bolt (M5) X602-000230 T-hex. wrench (5 mm) Removing and installing hex. socket bolt (M6) X602-000340 Torx wrench (T27) Removing and installing torx bolt...
  • Page 9: Starter System

    CS-501SX, CS-501SXH 501sx STARTER SYSTEM 2 STARTER SYSTEM (A) Starter case (G) Starter rope (B) Rope guide (H) Fan cover (C) Starter grip (J) Starter pawl (D) Rewind spring (K) Flywheel (E) Rewind spring case (L) Needle grommet (F) Rope reel...
  • Page 10: Disassembling Starter Assembly

    CS-501SX, CS-501SXH 501sx STARTER SYSTEM 2-1 Disassembling starter assembly 1. Remove four screws and remove starter assem- bly (A) from unit. 2. Pull out starter rope about 30 cm (12 in) and hold rope reel (B) by hand. Loop excess rope in rope reel notch (b) as shown.
  • Page 11: Replacing Starter Rope

    CS-501SX, CS-501SXH 501sx STARTER SYSTEM 2-2 Replacing starter rope 1. Pull out and untie knot (A). 2. Pull knot (B) to remove rope from rope reel (C). 3. When installing a new starter rope, singe both ends of the rope to prevent fraying. 4K287 4.
  • Page 12: Assembling Starter

    (c1) on starter case. 3. Assemble rope reel (D) engaging hook (d) with hook (a) of rewind spring. NOTE: Apply lithium based grease, ECHO XTend- ed Protection Lubricant or Red Armor Lubricant on around startet shaft (c2) of starter case (C) if dry.
  • Page 13 CS-501SX, CS-501SXH 501sx STARTER SYSTEM 2-3 Assembling starter (continued) 5. Reinstall bolt (E) on starter post. 6. Pull out starter rope inside starter case. Rotate rope reel clockwise several turns with starter rope hooked at notch (F) as shown. Hold rope reel to prevent it from unwinding and pull out starter grip to take the rope slack.
  • Page 14: Replacing Starter Pawl

    CS-501SX, CS-501SXH 501sx STARTER SYSTEM 2-4 Replacing starter pawl 1. Remove starter assembly from unit. 2. Loosen bolt (A) and remove washer, pawl (B), spacer (C) and torsion spring (D). Replace dam- aged or worn parts. NOTE: When it is hard to loosen bolt, install clean rope (E) in spark plug hole to stop crankshaft rota- tion and remove bolt easily.
  • Page 15: Ignition System

    CS-501SX, CS-501SXH 501sx IGNITION SYSTEM 3 IGNITION SYSTEM (A) Flywheel (E) Spark plug cap (B) Ignition coil (F) Switch lead (C) Spark plug (G) Ignition switch (D) Spark plug cap coil...
  • Page 16: Troubleshooting Guide

    CS-501SX, CS-501SXH 501sx IGNITION SYSTEM 3-1 Troubleshooting guide Start Remedy Inspect S.T. Adjust pole shoe air gaps. Pole (Inspect flywheel magnet shoe air at the same time. Go to gaps Clean / A if OK.) Spark plug Regap / S.T. Replace.
  • Page 17: Testing Spark

    CS-501SX, CS-501SXH 501sx IGNITION SYSTEM 3-2 Testing spark 1. Remove cleaner lid, air fi lter and cylinder cover. Remove spark plug cap from spark plug. 2. Connect Spark tester 897800-79931 (A) to high tension lead and connect tester lead (B) on spark plug.
  • Page 18: Inspecting Ignition Switch

    CS-501SX, CS-501SXH 501sx IGNITION SYSTEM 3-4 Inspecting ignition switch 1. Remove cleaner lid, air fi lter and cylinder cover. 2. Remove switch lead (A) from ignition coil. 3. Connect one probe of Ohm-meter or multi-meter to switch lead. Connect the other probe to cylinder fi...
  • Page 19: Inspecting Ignition Coil Resistance

    CS-501SX, CS-501SXH 501sx IGNITION SYSTEM 3-6 Inspecting ignition coil resistance 1. Remove cleaner lid, air fi lter and cylinder cover. 2. Connect one probe of Ohm-meter or multimeter to spark plug cap coil (A). 3. Connect the other probe to cylinder fin (B) to measure secondary coil resistance.
  • Page 20: Replacing Spark Plug Cap And Coil

    CS-501SX, CS-501SXH 501sx IGNITION SYSTEM 3-7 Replacing spark plug cap and coil 1. Disconnect spark plug cap (A) from spark plug. Remove cap cover from spark plug cap. 2. Apply some oil in spark plug cap (A) for easy re- moval from high tension lead (B).
  • Page 21: Setting Pole Shoe Air Gaps

    CS-501SX, CS-501SXH 501sx IGNITION SYSTEM 3-9 Setting pole shoe air gaps 1. Insert Module air gap gauge: 91004 (A) or 0.3 - 0.4 mm (0.012 - 0.016 in) thick feeler gauge be- tween fl ywheel and ignition coil shoes. 2. Rotate fl ywheel until magnetic poles of fl ywheel face ignition coil shoes.
  • Page 22 CS-501SX, CS-501SXH 501sx IGNITION SYSTEM 3-10 Inspecting fl ywheel and key (continued) 5. Remove starter pawls. Then set Puller Y089- 000111 (C) on fl ywheel as shown. 6. Tighten two nuts on the puller alternately to re- move fl ywheel. 7.
  • Page 23: Fuel System

    CS-501SX, CS-501SXH 501sx FUEL SYSTEM 4 FUEL SYSTEM ( A ) Fuel cap ( B ) O-ring ( C ) Fuel tank vent ( D ) Fuel tank ( E ) Fuel strainer ( F ) Fuel line ( G ) Pulse line ( H ) Carburetor ( J ) Carburetor elbow ( K ) Gasket...
  • Page 24: Inspecting Air Fi Lter

    CS-501SX, CS-501SXH 501sx FUEL SYSTEM 4-1 Inspecting air fi lter 1. Close choke shutter. Remove cleaner lid and air fi lter. 2. Inspect air fi lter (A). If blocked with dirt or dust, remove the obstruction with using brush. 2. If heavily blocked with dirt or dust, clean air fi lter (A) with compressed air or wash away with non- infl...
  • Page 25: Inspecting Fuel Tank And Line

    CS-501SX, CS-501SXH 501sx FUEL SYSTEM 4-3 Inspecting fuel tank and line 1. Clean fuel tank inside as required. 2. Remove cleaner lid, air fi lter and cylinder cover. 3. Disconnect fuel line (A) from carburetor. 4. Connect Pressure tester 897803-30133 (B) to fuel line.
  • Page 26: Inspecting And Replacing Tank Vent

    CS-501SX, CS-501SXH 501sx FUEL SYSTEM 4-4 Inspecting and replacing tank vent NOTE: Tank vent prevents a vacuum from forming in fuel tank when fuel in fuel tank is being con- sumed. When pressure in fuel tank becomes too high, tank vent releases the pressure. 1.
  • Page 27 CS-501SX, CS-501SXH 501sx FUEL SYSTEM 4-4 Inspecting and replacing tank vent (continued) NOTE: Inspection using 897803-30133 If Pressure / vacuum tester 91149 is not available, tank vent can be inspected with Pressure tester 897803-30133 as follows. 1. Connect tank vent (A) to Pressure tester 897803-30133 (B).
  • Page 28: Replacing Fuel Line

    CS-501SX, CS-501SXH 501sx FUEL SYSTEM 4-5-1 Replacing fuel line 1. Remove cleaner lid, air fi lter and cylinder cover. 2. Disconnect fuel line (A) and pulse line (B) from carburetor. 3. Remove carburetor by disconnecting throttle rod (C) and choke knob (D). 4.
  • Page 29: Replacing Fuel Vent Pipe

    CS-501SX, CS-501SXH 501sx FUEL SYSTEM 4-5-2 Replacing fuel vent pipe 1. Remove fuel tank vent (A) with pipe (B) from rear handle assembly (C). 2. Disconnect pipe (B) from fuel tank vent (A). Replace them if defective (Refer to “4-4 Inspecting and replacing tank vent”).
  • Page 30: Adjusting Carburetor

    CS-501SX, CS-501SXH 501sx FUEL SYSTEM 4-6 Adjusting carburetor 4-6-1 General adjusting rules A. Before adjustment, check the following items. 1. The correct spark plug must be clean and properly gapped. 2. The air fi lter element must be clean and properly installed. 3.
  • Page 31: Adjusting Carburetor

    CS-501SX, CS-501SXH 501sx FUEL SYSTEM 4-6-3 Adjusting carburetor 1. Start and warm engine for 100 seconds al- ternating engine speed between WOT and idle every 5 seconds. Turn H mixture needle (C) coun- terclockwise until engine speed drops to approx. 12,500 r/min at WOT.
  • Page 32: Air Shutter

    CS-501SX, CS-501SXH 501sx FUEL SYSTEM 4-7 Air shutter When it is cold weather (outside air temperature is 5 ºC/41ºF or lower) and acceleration is poor, re- lease air shutter. 1. Air shutter is located in cylinder cover (A). 2. Picture shows normal position (sun mark) of air shutter (B).
  • Page 33: Testing Carburetor

    CS-501SX, CS-501SXH 501sx FUEL SYSTEM 4-8 Testing carburetor NOTE: To perform this test, carburetor interior should be wet with fuel. If dry, a little leakage may occur from diaphragms and/or inlet needle seat. 1. Remove cleaner lid, air fi lter and cleaner case. Disconnect fuel line from carburetor.
  • Page 34: Inspecting Crankcase Pulse Passage

    CS-501SX, CS-501SXH 501sx FUEL SYSTEM 4-9 Inspecting crankcase pulse passage 1. Drop a little oil in the end of pulse line (A) as shown. 2. Remove spark plug and pull starter grip several times. Oil should spit back from the hole. 3.
  • Page 35: Inspecting Inlet Needle Valve

    CS-501SX, CS-501SXH 501sx FUEL SYSTEM 4-11 Inspecting inlet needle valve 1. Remove metering lever (A) and pivot pin. Re- move spring (B) and inlet needle valve (C). 2. Inspect inlet needle valve if worn or sticky. Clean or replace as required. NOTE: Causes of fuel fl...
  • Page 36: Replacing Welch Plug

    CS-501SX, CS-501SXH 501sx FUEL SYSTEM 4-13 Replacing Welch plug If engine does not run smoothly even after read- justing carburetor and inspecting carburetor parts, inspect low speed ports on carburetor as follows: 1. Remove metering lever and related parts to pro- tect them from damage.
  • Page 37: Installing Carburetor

    CS-501SX, CS-501SXH 501sx FUEL SYSTEM 4-14 Installing carburetor 1. Connect fuel line (A) and pulse line (B) to carbu- retor as shown. 2. Connect throttle rod (C) to carburetor. 3. Connect choke rod (D) with choke grommet (E) to carburetor. 4.
  • Page 38: Clutch System

    CS-501SX, CS-501SXH 501sx CLUTCH SYSTEM 5 CLUTCH SYSTEM ( A ) Crankcase ( B ) Collar ( C ) Worm gear ( D ) Clutch spring ( E ) Clutch hub ( F ) Clutch shoe ( G ) Clutch assembly ( H ) Needle bearing ( J ) Clutch drum ( K ) Sprocket...
  • Page 39: Inspectng Clutch Parts

    CS-501SX, CS-501SXH 501sx CLUTCH SYSTEM 5-1 Inspecting clutch parts 1. Remove sprocket guard (A), cleaner lid (B) and air fi lter. NOTE: If starter assembly is installed, pull starter rope out about 20 cm (8 in), and make a temporary knot (C) to prevent starter damage when installing clutch assembly.
  • Page 40: Replacing Clutch Parts

    CS-501SX, CS-501SXH 501sx CLUTCH SYSTEM 5-2 Replacing clutch parts 1. Install three clutch spring (A) to outside clutch hub (B). 2. Set three clutch shoes (C) to each arms of clutch hub (B) by fl at head screwdriver. 3. Set inside clutch hub (D) to clutch assembly by small fl...
  • Page 41 CS-501SX, CS-501SXH 501sx CLUTCH SYSTEM 5-3 Installing clutch assembly (Continued) 4. Apply lithium-based grease to needle bearing (E). Install clutch drum (F) and needle bearing (E) on crankshaft, placing the hands (b) of worm gear (B) in cutouts (f) of clutch drum. 5.
  • Page 42: Chain Brake System

    CS-501SX, CS-501SXH 501sx CHAIN BRAKE SYSTEM 6 CHAIN BRAKE SYSTEM ( A ) Brake lever ( J ) Brake cover ( B ) Collar ( K ) Sprocket guard plate ( C ) Torsion spring ( L ) Sprocket guard plate ( D ) Brake seal plate ( M ) Chain tensioner ( E ) Brake band...
  • Page 43: Disassembling Chain Brake

    CS-501SX, CS-501SXH 501sx CHAIN BRAKE SYSTEM 6-1 Disassembling chain brake WARNING DANGER Wear eye protection and safety gloves when disassembling or assembling chain brake to protect eye and hand from injury. 1. Move brake lever (A) to chain brake engaging position.
  • Page 44: Assembling Brake Parts

    CS-501SX, CS-501SXH 501sx CHAIN BRAKE SYSTEM 6-2 Assembling brake parts 1. Install spring pin (B) through hole (a1) of brake band (A). Hook end (a2) of brake band (A) through hole (c1) of brake connector (C). Tighten brake band (A) and brake connector (C) with screw (D). Slide in coil spring (E) to the end (c2) of brake con- nector (C).
  • Page 45: Saw Chain Lubrication System

    CS-501SX, CS-501SXH 501sx SAW CHAIN LUBRICATION SYSTEM 7 SAW CHAIN LUBRICATION SYSTEM ( A ) Oil cap ( B ) O-ring ( C ) Connector ( D ) Oil tank vent ( E ) Crankcase ( e ) Oil tank ( F ) Oil strainer ( G ) Oil line ( H ) Auto-oiler assembly...
  • Page 46: Inspecting Oil Cap And Strainer

    CS-501SX, CS-501SXH 501sx SAW CHAIN LUBRICATION SYSTEM 7-1 Inspecting oil cap and strainer 1. Remove oil cap. 2. Inspect oil cap for cracks and O-ring (A) for cuts or damage. Replace worn or damaged parts as re- quired. 3. Pull oil strainer (B) from oil tank using a wire hook (C).
  • Page 47: Inspecting Auto-Oiler Assembly And Oil Line

    CS-501SX, CS-501SXH 501sx SAW CHAIN LUBRICATION SYSTEM 7-2 Inspecting auto-oiler assembly and oil line 1. Remove three bolts (A) and brake cover (B). 2. Remove coil spring (C) using fl at head screw- driver (D). 3. Remove brake lever (E), coil spring (C), brake band (F), oiler cover (G) and related parts.
  • Page 48: Inspecting Oil Tank Vent

    CS-501SX, CS-501SXH 501sx SAW CHAIN LUBRICATION SYSTEM 7-3 Inspecting oil tank vent NOTE: Oil tank vent prevents a vacuum from forming in oil tank when chain oil in the tank is con- sumed. 1. Inspect oil tank vent (A) for clog or deformation. Replace as requied.
  • Page 49: Engine

    CS-501SX, CS-501SXH 501sx ENGINE 8 ENGINE ( A ) Oil seal ( B ) Crankcase ( C ) Ball bearing ( D ) Crankshaft assembly ( E ) Washer ( F ) Needle bearing ( G ) Snap ring ( H ) Piston pin ( J ) Piston ( K ) Piston ring ( L ) Cylinder...
  • Page 50: Testing Cylinder Compression

    CS-501SX, CS-501SXH 501sx ENGINE 8-1 Testing cylinder compression NOTE: Test cylinder compression when engine is cold. 1. Move ignition switch to STOP position. Then re- move spark plug. 2. Install Compression gauge 91037 (A) in spark plug hole and tighten by hand. Pull starter several times to stabilize reading on compression gauge.
  • Page 51: Inspecting Muffl Er And Exhaust Port

    CS-501SX, CS-501SXH 501sx ENGINE 8-3 Inspecting muffl er and exhaust port 1. Remove cleaner lid, air fi lter and cylinder cover. 2. Remove muffl er with muffl er gasket. 3. Inspect cylinder exhaust port and clean the port using wooden or plastic stick if carbon is found. NOTE: When cleaning exhaust port, always posi- tion piston at Top Dead Center (TDC) to prevent carbon from entering cylinder.
  • Page 52: Testing Crankcase And Cylinder Seal

    CS-501SX, CS-501SXH 501sx ENGINE 8-4 Testing crankcase and cylinder seal 1. Remove cleaner lid, air fi lter and cylinder cover. 2. Disconnect fuel line, pulse line and choke rod from carburetor, and remove carburetor from the unit. 3. To seal intake port, install Pressure rubber plug 897826-16131 (A) between intake insulator and carburetor, using carburetor screws (C).
  • Page 53: Inspecting Cylinder

    CS-501SX, CS-501SXH 501sx ENGINE 8-5 Inspecting cylinder 1. Remove carburetor from the unit (Refer to “4-5-1 Replacing fuel line”). 2. Remove muffl er with muffl er gasket (Refer to “8-3 Inspecting muffl er and exhaust port”). 3. Remove 4 bolts from cylinder base through holes (A).
  • Page 54: Inspecting Piston And Piston Ring

    CS-501SX, CS-501SXH 501sx ENGINE 8-6 Inspecting piston and piston ring 1. Inspect piston ring and replace it if broken or scored, or if it exceeds service limits (Refer to “1- 5”). 2. Inspect piston crown. Clean with fi ne sand pa- per, oil stone, or soft cleaning brush (A) if carbon is found.
  • Page 55: Replacing Oil Seal

    NOTE: Before removing fl ywheel side oil seal, re- move woodruff key. 2. Remove oil seal (A) using fl at head screwdriver. 3. Apply lithium based grease, ECHO XTended Protection Lubricant or Red Armor Lubricant on in- ner rubber lips of new oil seal.
  • Page 56: Replacing Ball Bearing And Oil Seal

    CS-501SX, CS-501SXH 501sx ENGINE 8-9 Replacing ball bearing and oil seal 1. After disassembling crankshaft, check ball bear- ing for smooth rotation. If rough, replace it (them) with new one. NOTE: At the same time, replace oil seal with new one.
  • Page 57: Assembling Crankshaft And Crankcase

    501sx ENGINE 8-9 Replacing ball bearing and oil seal (continued) 9. Apply lithium based grease, ECHO XTended Protection Lubricant or Red Armor Lubricant on in- ner rubber lips of new oil seal. 10. Lubricate circumferences of new oil seal with high melting point grease.
  • Page 58: Installing Piston

    CS-501SX, CS-501SXH 501sx ENGINE 8-11 Installing piston 1. Place piston over the small end of connecting rod, so that the arrow mark (A) on piston points front as shown. 2. Insert piston pin guide (B) stamped “11”, through piston, washers (C) and needle bearing (D) in con- necting rod as shown.
  • Page 59: Installing Piston Ring And Cylinder

    CS-501SX, CS-501SXH 501sx ENGINE 8-12 Installing piston ring and cylinder 1. Install piston ring on piston, ensuring the end gaps of piston ring are properly positioned around locating pin (A) as shown. 2. Temporarily paste new cylinder gasket (B) on cylinder base with a little glue for easier installation of cylinder.
  • Page 60: Rear Handle And Control System

    CS-501SX, CS-501SXH 501sx REAR HANDLE AND CONTROL SYSTEM 9 REAR HANDLE AND CONTROL SYSTEM ( A ) Rear handle ( B ) Spring pin ( C ) Torsion spring ( D ) Throttle trigger ( E ) Throttle lockout ( F ) Rear handle cover ( G ) Grip ( H ) Cushions ( J ) Cushion caps...
  • Page 61: Replacing Cushions

    CS-501SX, CS-501SXH 501sx REAR HANDLE AND CONTROL SYSTEM 9-1 Replacing cushions 1. Remove four cushion caps (A) (Refer to cushion caps (J) of “9 REAR HANDLE AND CONTROL SYSTEM”on previous page). 2. Remove a bolt (B), four cushion caps (A), four bolts (C) under cushion caps (A) and rear handle from unit.
  • Page 62 CS-501SX, CS-501SXH 501sx REAR HANDLE AND CONTROL SYSTEM 9-1 Replacing cushions (continued) 6. Inspect cushions (E) for cracking or wear. If damaged, replace with new cushions as follows. 7. To remove cushions (E), pull by hand in direc- tion of arrows. 8.
  • Page 63: Replacing Throttle Trigger

    CS-501SX, CS-501SXH 501sx REAR HANDLE AND CONTROL SYSTEM 9-2 Replacing throttle trigger 1. Loosen screw (A) and remove grip (B), rear handle cover (C) and throttle lockout (D). 2. Inspect grip (B), rear handle cover (C) and throt- tle lockout (D) for cracking or wear. If damaged, replace it as required.
  • Page 64 CS-501SX, CS-501SXH 501sx REAR HANDLE AND CONTROL SYSTEM 9-2 Replacing throttle trigger (continued) 5. Set torsion spring (H) on throttle trigger (G) as shown. 6. Install throttle trigger (G) with torsion spring (H) and insert spring pin (E) as follows. 1) Insert spring pin (E) in the hole of rear handle so the tip of spring pin does not protrude inside handle.
  • Page 65: Service Hint For Heated Handle (Cs-501Sxh Only)

    CS-501SX, CS-501SXH 501sx REAR HANDLE AND CONTROL SYSTEM 9-3 Service hint for heated handle (CS-501SXH only) ( A ) Front handle assembly (with heater) ( B ) Band ( C ) Handle cover ( D ) Heater switch ( E ) Nut ( F ) Rear handle cover ( G ) Rear handle ( H ) Cushion...
  • Page 66: Inspecting Heated Handle

    CS-501SX, CS-501SXH 501sx REAR HANDLE AND CONTROL SYSTEM 9-3-1 Inspecting heated handle Inspecting stator assembly 1. Remove air cleaner cover (A), air fi lter and han- dle cover (B). 2. Disconnect stator lead coupler (C). NOTE: If it is not clear which is stator lead coupler (C), remove carburetor and carburetor elbow, and check where the lead is connected to.
  • Page 67 CS-501SX, CS-501SXH 501sx REAR HANDLE AND CONTROL SYSTEM 9-3-1 Inspecting heated handle (continued) Inspecting rear handle heater 1. Disconnect rear handle heater lead coupler (A). NOTE: If it is not clear which is rear handle heater lead coupler (A), remove carburetor and carburetor elbow, and check where the lead is connected to.
  • Page 68: Replacing Stator Assembly

    CS-501SX, CS-501SXH 501sx REAR HANDLE AND CONTROL SYSTEM 9-3-2 Replacing stator assembly 1. Remove air cleaner cover and handle cover. 2. Remove four bolts and remove starter assembly (A) from unit. 3. Disconnect stator lead coupler (B). NOTE: If it is not clear which is stator lead coupler (B), remove carburetor and carburetor elbow, and check where the lead is connected to.
  • Page 69: Replacing Rear Handle Heater

    CS-501SX, CS-501SXH 501sx REAR HANDLE AND CONTROL SYSTEM 9-3-2 Replacing stator assembly (continued) 9. Remove two bolts (H) and remove stator as- sembly (J). 10. Install new stator assembly, and connect stator lead coupler (B). 11. Reinstall disassembled parts. 9-3-3 Replacing rear handle heater 1.
  • Page 70 CS-501SX, CS-501SXH 501sx REAR HANDLE AND CONTROL SYSTEM 9-3-3 Replacing rear handle heater (continued) 4. Remove boots (J) and + rear handle heater. 5. Install new rear handle heater. 6. Pass the rear handle heater lead (K) as shown. 7. Pass the rear handle heater lead (L) as shown. 8.
  • Page 71: Replacing Heater Switch

    CS-501SX, CS-501SXH 501sx REAR HANDLE AND CONTROL SYSTEM 9-3-3 Replacing rear handle heater (continued) 10. Insert the tab (e) of rear handle cover (E) into rear handle, and install rear handle cover (E) on rear handle, while pushing the rear handle cover (E) as shown.
  • Page 72: Guide Bar Mounting System

    CS-501SX, CS-501SXH 501sx GUIDE BAR MOUNTING SYSTEM 10 GUIDE BAR MOUNTING SYSTEM ( A ) Sprocket guard ( B ) Inner sprocket guide plate ( C ) Outer sprocket guide plate ( D ) Tensioner screw ( E ) Chain tensioner ( F ) Collar ( G ) Bevel gear ( H ) Bevel gear...
  • Page 73: Replacing Chain Tensioner

    CS-501SX, CS-501SXH 501sx GUIDE BAR MOUNTING SYSTEM 10-1 Replacing chain tensioner 1. Remove sprocket guard (A) from the unit. 2. Remove outer guide plate (B) and collar (C) from sprocket guard. Remove tensioner screw (D), chain tensioner (E) and bevel gears (F) (G). 3.
  • Page 74: Installing Guide Bar Stud

    CS-501SX, CS-501SXH 501sx GUIDE BAR MOUNTING SYSTEM 10-3 Installing guide bar stud 1. Apply adhesive (Loctite #609, ThreeBond 1373 or equivalent) to un-threaded part (a) of new guide bar stud (A). 2. Install new stud (A) to the stud-hole of oil tank using a pair of tweezers (B).
  • Page 75: Maintenance Guide

    CS-501SX, CS-501SXH 501sx MAINTENANCE GUIDE 11 MAINTENANCE GUIDE 11-1 Disassembly chart Cleaner Sprocket Starter guard assembly Cylinder (2-1,5-1,6-1) (2-1) cover Clutch Muffler Brake cover Air filter Spark plug drum (8-3) (4-1) (6-1,7-2) (3-3) (5-1,5-3) Clutch assembly, Brake lever Worm gear Carburetor (6-1,7-2) (5-1,5-3)
  • Page 76: Troubleshooting Guide

    CS-501SX, CS-501SXH 501sx MAINTENANCE GUIDE 11-2 Troubleshooting guide TROUBLE Engine does not crank. Engine does not start. Fuel leaks. Idling is not stable. Acceleration is poor. Engine stalls at high speed. Engine lacks power. Engine seizure / overheat Engine misfires. Engine / others are extremely noisy.
  • Page 77 CS-501SX, CS-501SXH 501sx MAINTENANCE GUIDE 11-2 Troubleshooting guide (continued) INSPECTING REFERENCES Inspecting first. Fuel system / Carburetor 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 Air filter Fuel cap / strainer Carburetor adjustment Fuel tank / line / vent 4-3 to 4-5 Carburetor leakage...
  • Page 78: Service Intervals

    CS-501SX, CS-501SXH 501sx MAINTENANCE GUIDE 11-3 Service Intervals Intervals Inspecting point Service Reference 3 months Before use 100 hour Screws and bolts * Retighten / Replace Air fi lter Inspect / Replace / Clean Choke system Inspect / Replace Carburetor Inspect / Repair 4-8 to 4-14 Fuel leaks...
  • Page 79 CS-501SX, CS-501SXH 501sx MEMORANDUM...
  • Page 80 Published by YAMABIKO Corp. Tokyo Japan 1902...

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