Page 1
Workshop Manual TE 125 2011 SMS4 2011 Part. N. 8000H4704 (07-2010)
Page 2
HUSQVARNA MOTORCYCLES S.R.L. - Varese disclaims all liabilities for any errors or omissions in this manual and reserves the right to make changes to reflect on-going product development. Illustrations in the ma- nual may differ from actual components. No reproduction in full or in part without written authorisation.
FOREWORD, TABLE OF CONTENTS Workshop Manual TE 125 2011 SMS4 2011 Copyright by HUSQVARNA MOTORCYCLES S.R.L. BMW Group Technical Service Via Nino Bixio, 8 21024 (Varese) - Italy tel. ++39 0332 75.61.11 tel. ++39 0332 756 558 www.husqvarna-motorcycles.com 1st edition (07-2010) Printed in Italy Print no.
Page 4
FOREWORD, TABLE OF CONTENTS Foreword This publication is designed for use by HUSQVARNA Service Centres to assist authorised personnel in the maintenance and repair of the models covered in this manual. The technical information provided in this manual is a critical comple- ment to operator training and operators should become thoroughly familiar with it.
FOREWORD, TABLE OF CONTENTS Table of Contents Title Section Foreword, table of contents ................. a Important notices ....................b General information .....................A Engine Technical data ..................F Engine overhaul....................F1 Engine Maintenance ..................F2 Engine cooling ....................F3 Carburettor ......................F4 NOTES Unless otherwise specified, data and specifications apply to all models. Part.
Page 7
GENERAL INFORMATION Section Part. N. 8000 H4704 (07-2010)
Page 8
GENERAL INFORMATION Engine ......................A.3 Timing system ....................A.3 Fuel system ....................A.3 Lubrication ....................A.3 Cooling ......................A.3 Ignition system....................A.3 Starter ......................A.3 Drive and Transmission ................A.3 Chassis ......................A.4 Suspension ....................A.4 Brakes ......................A.4 Wheels......................A.4 Tyres ......................A.4 Electrical components location ..............A.5 Overall dimensions - Weight .................A.6 Capacities .....................A.7 Part.
GENERAL INFORMATION Cold tyre pressure (TE) Front Rider only .................... 17.07 Psi Rider and passenger ................21.5 Psi Rear Rider only .................... 21.33 Psi Rider and passenger ................25.5 Psi Cold tyre pressure (SMS) Front Rider only .................... 21.33 Psi Rider and passenger ................
GENERAL INFORMATION Overall dimensions - Weight Kerb weight, without fuel (TE-SMS): ........117 Kg (257.94 lb) 800 mm (31,50 inch) * 1450 mm (57,09 inch) 2235 mm (87,99 inch) H02401 *: Max. Width Part. N. 8000 H4704 (07-2010)
IMPORTANT NOTICES Section Part. N. 8000 H4704 (07-2010)
Page 16
Section B by having the required SMS4 maintenance inspections carried out at authorised HUSQVARNA dealers. The cost for changing parts and for the labour necessary in order to comply with the maintenance plan is charged to the Client. The warranty becomes NULL AND VOID if the motorcycle is rented.
Page 17
TECHNICAL DATA Section Part. N. 8000 H4704 (07-2010)
Page 18
TECHNICAL DATA Technical data: Engine ................. F.3 Technical data: Electrical system..............F.9 Technical data: Tightening torque figures ..........F.10 Technical data: Engine torque figures ............F.11 Technical data: Lubrication points and types of Lubricant ......F.14 Technical data: Diagrams and Tables about the Lubrication System ..F.16 Part.
TECHNICAL DATA ENGINE TECHNICAL DATA Engine • Engine type ..........................4-stroke, liquid cooled, SOHC • Displacement ................................124.7 cm3. • Cylinders layout ..........................Single-cylinder tilted forward • Bore x stroke ..........................52.0 x 58.6 mm (2.05 x 2.31 in) • Compression ratio ................................11.20:1 •...
Page 20
TECHNICAL DATA Cylinder head • Volume ........................... 9.90-10.50 cm3 (0.60-0.64 cu.in) • Deformation limit ............................0.03 mm (0.0012 in) Camshaft • Transmission system ............................Chain-drive (left) Camshaft lobe dimensions • Intake A ...........................30.225-30.325 mm (1.1900-1.1939 in) • Limit ................................ 30.125 mm (1.1860 in) •...
Page 21
TECHNICAL DATA • (Intake) valve face B width ....................1.538-2.138 mm (0.0606-0.0842 in) • (Exhaust) valve face B width ....................1.538-2.138 mm (0.0606-0.0842 in) • (Intake) valve seat C width .....................0.90-1.10 mm (0.0354-0.0433 in) • Limit .................................. 1.6 mm (0.06 in) • (Exhaust) valve seat C width ....................0.90-1.10 mm (0.0354-0.0433 in) •...
Page 22
TECHNICAL DATA • Winding direction (intake) ............................Clockwise • Winding direction (exhaust) ............................Clockwise Cylinder • Bore ..........................52.000-52.010 mm (2.0472-2.0476 in) • Wear limit ............................... 52.110 mm (2.0516 in) • Taper limit ..............................0.050 mm (0.0020 in) • Out-of-round limit .............................
Page 23
TECHNICAL DATA Scraper ring • Dimensions (B x T) ........................1.50 x 1.95 mm (0.06 x 0.08 in) • Piston ring ends gap (when installed) ..................0.20-0.70 mm (0.0079-0.0276 in) • Ring side play ........................0.040-0.160 mm (0.0016-0.0063 in) Crankshaft • Width A ............................47.95-48.00 mm (1.888-1.890 in) •...
Page 24
TECHNICAL DATA • ..................................24/21 (1.143) • ..................................22/23 (0.957) • ..................................21/25 (0.840) • Input shaft offset limit ..........................0.08 mm (0.0032 in) • Output shaft offset limit ..........................0.08 mm (0.0032 in) Gear selector mechanism • Type of gear selector mechanism ....................Gear selector drum and shaft •...
Page 25
TECHNICAL DATA ELECTRICAL SYSTEM SPECIFICATIONS Voltage • System voltage ..................................12 V Ignition system • Ignition system .................................TCI (digital) • Ignition advance (BTDC) Ignition coil • Model/manufacturer ............................. 2JN/YAMAHA • Primary coil resistance ..........................1.92÷2.88 Ω at 20° • Secondary coil resistance ..........................
Page 26
TECHNICAL DATA TIGHTENING TORQUE FIGURES TIGHTENING TORQUE FIGURES GENERAL SPECIFICATIONS The chart contains the tightening torque figures for the standard fasteners with standard ISO thread pitch. Tightening torque figures specifications for special assemblies or components can be found in the relevant chapters of this manual. To avoid deformations, gradually tighten the fasteners in a cross pattern, until reaching the specified tightening torque.
Page 27
TECHNICAL DATA ENGINE TORQUE FIGURES Cylinder head tightening sequence: Element Thread Quantity Tightening torque Remarks Cylinder head bolt 22 Nm (2.2 m·kg, 16 ft-lb) Cylinder head bolt 10 Nm (1.0 m·kg, 7.2 ft-lb) Spark plug 13 Nm (1.3 m·kg, 9.4 ft-lb) Cylinder head cover bolt 10 Nm (1.0 m·kg, 7.2 ft-lb) Oil level inspection plug...
Page 29
TECHNICAL DATA Generator cover tightening sequence: Clutch casing tightening sequence: Crankcase tightening sequence: A. Left crankcase B. Right crankcase Part. N. 8000 H4704 (07-2010) F.13...
Page 30
TECHNICAL DATA LUBRICATION POINTS AND TYPES OF LUBRICANT ENGINE Lubrication point Lubricant Oil seal lips Bearings Cylinder head bolts seat, thread and washers Water pump assembly O-ring Cylinder head cover gasket Connecting rod big end Piston pin Cylinder inner surface, piston, piston rings grooves and piston rings Balance shaft O-ring Camshaft lobes and rocker arm rollers Decompression chamber cam...
Page 31
TECHNICAL DATA Lubrication point Lubricant Starter motor O-ring Unidirectional starter idle gear shaft and unidirectional starter idle gear inner surfa- Unidirectional starter idle gear washer and thrust surfaces Clutch control lever Primary driven gear inner surface Long clutch pushrod Ball and short clutch pushrod Clutch pushrod ball Clutch hub seat and thread Input shaft and sprockets...
Page 32
TECHNICAL DATA DIAGRAMS AND TABLES ABOUT THE LUBRICATION SYSTEM ENGINE OIL LUBRICATION CHART Oil pump Oil filter element Crankshaft Camshaft Input shaft Output shaft F.16 Part. N. 8000 H4707 (07-2010)
Page 33
TECHNICAL DATA LUBRICATION DIAGRAMS Clutch control lever Input shaft Output shaft Crankshaft Oil filter Oil pump assembly Oil filter To cylinder head Part. N. 8000 H4704 (07-2010) F.17...
Page 34
TECHNICAL DATA Camshaft Crankshaft Input shaft Output shaft F.18 Part. N. 8000 H4707 (07-2010)
ENGINE OVERHAUL CyLINdER HEAd REmOVAL New = part to be replaced upon reassembly Cylinder head removal quen- Operation/parts to remove Quantity Remarks Spark plug cap Disconnect Spark plug Crankshaft end access screw Timing mark access screw Engine assembly nut/bolt (front side) Cylinder head cover Cylinder head cover gasket Clutch cable support...
Page 40
ENGINE OVERHAUL CyLINdER HEAd REmOVAL New = Cylinder head removal part to be replaced upon reassembly quen- Operation/parts to remove Quantity Remarks Timing chain guide (exhaust side) Washer Head clamp screw Head cover clamp screw Reverse removal procedure to install. * Sealant Three Bond No.1215®...
Page 41
ENGINE OVERHAUL CyLINdER HEAd REmOVAL 1. Align: • Reference "I" "a" on generator rotor (with the stationary re- ference "b" on the generator cover). Keep the thermostat "1" suspended in a container "2" full of water. (see fig. 01) Rotate the crankshaft anticlockwise. b.
ENGINE OVERHAUL 4. Remove: • Cylinder head • NOTE: • Slacken the bolts in the correct indicated sequence. • Slacken each bolt of 1/2 turn at the time. Once all the bolts have been slackened, remove bolts 1, 2, 4 and 6, then remove the cylinder head with bolts 3 and 5 inserted in their holes. CyLINdER HEAd CHECk 1.
ENGINE OVERHAUL CAmsHAft spROCkEt ANd tImING CHAIN GUIdE CHECk 1. Check: • Camshaft sprocket. • Over 1/4 of "a" wear tooth Replace as a block the camshaft sprocket, the timing chain and the crankshaft. (see fig. 07) a. 1/4 of tooth b.
ENGINE OVERHAUL dECOmpREssION systEm CHECk 1. Check: • Decompression system Check the decompression system with the camshaft sprocket and the decompression chamber cam installed in the camshaft. b. Check that the decompression chamber lever "1" moves easily. (see fig. 10) c.
ENGINE OVERHAUL CyLINdER HEAd INstALLAtION 1. Install: • Cylinder head • Make the timing chain go through the timing chain notch. 2. tighten: • Cylinder head bolts "1" (see fig. 12) • Cylinder head bolts "2" (see fig. 12) • Cylinder head bolt 22 Nm - 2.2 kgm - 16 ft-lb • Lubricate cylinder head bolts and washers with engine oil.
Page 46
ENGINE OVERHAUL CyLINdER HEAd INstALLAtION 1. Install: • timing chain tensioner gasket • Timing chain tensioner Apply sealant to the timing chain tensioner bolt threading. • sealant three bond No.1215® b. Slightly press with your hands the timing chain tensioner rod and at the same time rotate it completely clockwise with a thin blade screwdriver "1"...
Page 47
ENGINE OVERHAUL 5. Rotate: • Crankshaft (various revolutions clockwise) 6. Check: • Reference " I " "a" • Align the reference " I " on the generator rotor to the stationary reference "b" on the generator cover. • Reference " I " "c" • Align the reference " I " on the camshaft sprocket to the statio- nary reference "d" on the cylinder head. • Misalignment Correct. • Make reference to installation operations mentioned above. 7. Tighten: • Camshaft sprocket bolt • Camshaft sprocket bolt 30 Nm (3.0 mkg, 22 ft-lb) WARNING! • Make sure the camshaft sprocket bolt is tighte- ned to the specified torque to avoid the bolt from loosening and damaging the engine. 8. Measure: • Valve clearance • Not conforming to specifications Adjust. Part.
ENGINE OVERHAUL CAmsHAft CHECk 1. Check: • Camshaft lobes Discoloured blue/pittings/scratches Replace the camshaft. 2. measure: • Dimensions of camshaft lobes "a" and "b" Not conforming to specifications Replace the camshaft. (see fig. 17) • Camshaft lobe dimensions • Intake A 30.225-30.325mm (1.1900-1.1939 in) •...
Page 50
ENGINE OVERHAUL HAS23880 ROCkER ARm ANd ROCkER ARm sHAfts CHECk 5. Calculate: • Rocker arm - rocker arm shaft clearance • Calculate the clearance subtracting the outside diameter of the rocker arm shaft from the inside diameter of the rocker arm. • Not conforming to specifications Replace faulty part(s). •...
Page 51
ENGINE OVERHAUL VALVE ANd VALVE spRING REmOVAL New = Valve and valve spring removal part to be replaced upon reassembly quen- Operation/parts to remove Quantity Remarks Cylinder head Rocker arms/camshaft Valve collet Upper spring seat Valve spring Intake valve Exhaust valve Valve stem seal Lower spring seat Valve guide...
ENGINE OVERHAUL VALVE REmOVAL • The following procedure is applied to all the valves and their components. • Before removing the inside components of the cylinder head (e.g. valves, valve springs and valve seats), check for correct valve sealing. 1. Check: • Valve sealing Loss of valve seal Check valve face, valve seat and width of the valve seat. Pour a clean solvent "a"...
ENGINE OVERHAUL VALVEs ANd VALVE GUIdEs CHECk • The following procedure is applied to all the valves and valve guides. measure: • Valve stem - valve guides clearance Not conforming to specifications Replace valve guide. Valve stem - valve guides clearance = Inside diameter of valve guide "a"...
Page 54
ENGINE OVERHAUL After installation, ream the valve guide with its reamer "3" to get the correct valve stem - valve guide clearance.(see fig. 28) • After replacing the valve guide, grind the valve seat. to delete: • Scale deposits (from valve face and seat) Check: • Valve face Pittings/wear Ream valve face.
ENGINE OVERHAUL VALVE sEAts CHECk • The following procedure is applied to all the valves and valve seat. 1. to delete: • Scale deposits (from valve face and seat) 2. Check: • Valve seat Pittings/wear Replace cylinder head. 3. measure: •...
Page 56
ENGINE OVERHAUL HAS24300 VALVE sEAts CHECk • To obtain the best results when lapping, slightly patter on the valve seat while rotating it back and forth with the hands. e. Apply a fine grain lapping abrasive agent to the valve face and repeat the previous procedures. f. After each lapping operation, remove every trace of lapping abrasive agent from the valve face and valve seat.
ENGINE OVERHAUL VALVE SPRINGS CHECK • The following procedure is applied to all valve springs. 1. Measure: • Valve spring "a" free length Not conforming to specifications Replace valve spring. (see fig. 38) • (Intake) free length 41.71 mm (1.64 in) • Limit 39.62 mm (1.56 in) • (Exhaust) free length 41.71 mm (1.64 in) • Limit 39.62 mm (1.56 in) 2.
ENGINE OVERHAUL VALVEs INstALLAtION • The following procedure is applied to all the valves and their components. 1. trim: • End of the valve stem (with the whetstone) 2. Lubricate: • Valve stem "1" • Valve stem seal "2" (with recommended lubricant) (see fig. 42) •...
Page 59
ENGINE OVERHAUL 4. Install: • Valve collets "1" • Install the valve collets compressing the valve spring with the suitable tool. 5. To fix the valve collets to the valve stem, slightly patter with a soft mallet on the end of the valve. WARNING! • If you hit valve tip too hard you could damage the valve.
ENGINE OVERHAUL pIstON ANd CyLINdER REmOVAL piston and cylinder removal New = part to be replaced upon reassembly quen- Operation/parts to remove Quantity Remarks Cylinder head Cylinder Cylinder gasket Dowel pin Piston pin clip Piston pin Piston Upper piston ring Lower piston ring Scraper ring Reverse removal procedure to install.
ENGINE OVERHAUL pIstON REmOVAL 1. Remove: • Piston pin clips "1" • Piston pin "2" • Piston "3" (see fig. 47) WARNING! • do not use a hammer to remove the piston pin. • Before removing the piston pin clip, cover the opening of the crankcase with a clean cloth to avoid the piston pin clip from falling into the crankcase.
ENGINE OVERHAUL pIstON ANd CyLINdER CHECk 1. Check: • Piston wall • Cylinder wall Vertical scratches Replace the cylinder and replace as a block piston and piston rings. 2. measure: • Cylinder - piston clearance Measure cylinder "C" bore with a bore meter. • Measure cylinder bore "C" at (three) different heights; at every height take two measurements at right angle.
ENGINE OVERHAUL pIstON RINGs CHECk 1. measure: • Piston rings side clearance Not conforming to specifications Replace the piston and piston rings together. • Before measuring piston rings side clearance, eliminate carbon deposits from piston rings and their grooves. • piston ring •...
ENGINE OVERHAUL pIstON ANd CyLINdER INstALLAtION 1. Install: • Upper piston ring "1" • Lower piston ring "2" • Scraper ring expander "3" • Lower scraper ring "4" • Upper scraper ring "5" (see fig. 56) • Make sure the piston rings are installed with manufacturer references or numbers facing upwards. 2.
ENGINE OVERHAUL GENERAtOR ANd UNIdIRECtIONAL stARtER New = part to be replaced upon reassembly Generator and unidirectional starter removal quen- Operation/parts to remove Quantity Remarks Engine oil Sprocket cover Stator coil connector Disconnect. 2 Crankshaft position sensor connector Disconnect. 3 Neutral switch cable connector Disconnect.
Page 67
ENGINE OVERHAUL New = Generator and unidirectional starter removal part to be replaced upon reassembly quen- Operation/parts to remove Quantity Remarks Stator coil Generator rotor Woodruff key Unidirectional starter gear Bearing Washer Unidirectional starter idle gear shaft Washer Snap ring Unidirectional starter idle gear Unidirectional starter unit Reverse removal procedure to install.
ENGINE OVERHAUL GENERAtOR INstALLAtION 1. Install: • Woodruff key • Generator rotor • Washer • Generator rotor nut • Clean the tapered part of the crankshaft and the generator rotor hub. • When installing the generator rotor, make sure the Woodruff key is correctly fixed in the crankshaft keyway. 2. tighten: • Generator rotor nut "1" (see fig. 66) • Generator rotor nut 70 Nm (7.0 mkg, 50 ft-lb) • Blocking the generator rotor "2" with suitable tool "3", tighten the generator rotor bolt.
ENGINE OVERHAUL ELECtRIC stARtING dEVICE starter motor removal quen- Operation/parts to remove Quantity Remarks Starter motor Starter motor cable Disconnect. Reverse removal procedure to install. Part. N. 8000 H4704 (07-2010) F1.35...
ENGINE OVERHAUL stARtER mOtOR dIsAssEmbLy starter motor removal New = part to be replaced upon reassembly quen- Operation/parts to remove Quantity Remarks O-ring Starter motor rear cover O-ring Switch Starter motor front cover/brush support set Brush Brush spring Reverse removal procedure to install. F1.36 Part.
ENGINE OVERHAUL STARTER MOTOR CHECK 1. Check: • Switch Impurity Clean with sand paper of 600 grain. 2. Measure: • switch "a" diameter Not conforming to specifications Replace the starter motor. (see fig. 69) • Limit 16.6 mm (0.65 in) 3. Measure: • Mica "a" coating Not conforming to specifications Scrape off the mica coating until the correct value with a saw blade appropriately grounded, to adapt it to the switch. • Mica coating (depth) 1.35 mm (0.05 in) • The switch mica coating must be made thin to assure the switch correct operation.
ENGINE OVERHAUL stARtER mOtOR CHECk 5. measure: • Brush "a" length (see fig. 72) Not conforming to specifications Replace the starter motor front cover/brush support set. • Limit 3.50 mm (0.14 in) 6. measure: • Brush spring pressure Not conforming to specifications Replace the brush springs together.
ENGINE OVERHAUL CLUtCH New = Clutch casing removal part to be replaced upon reassembly quen- Operation/parts to remove Quantity Remarks Engine oil Disconnect Clutch cable Disconnect Oil filter element cover Oil filter element Clutch casing Clutch casing gasket Dowel pin Oil seal Reverse removal procedure to install.
ENGINE OVERHAUL CONtROL LEVER REmOVAL New = Control lever removal part to be replaced upon reassembly quen- Operation/parts to remove Quantity Remarks Clutch control lever Clutch control lever spring Snap ring Oil seal Bearing Reverse removal procedure to install. F1.42 Part.
ENGINE OVERHAUL CLUtCH pLAtE CHECk • The following procedure applies to all clutch plates. 1. Check: • Clutch plate Damage Replace the clutch plates together. 2. measure: • Clutch plate deformation (with a surface plane and a feeler gauge "1") Not conforming to specifications Replace clutch plates together.
ENGINE OVERHAUL CLUtCH INstALLAtION 1. Install: • Spring washer "1" (see fig. 82) • Install the spring washer as shown in the figure. 2. Install: • Clutch housing • Thrust washer "1" • Make sure the thrust washer is installed with sharp side "a" opposite to the clutch hub. 3. Install: • Clutch hub "1" • Lock washer "2" •...
Page 84
ENGINE OVERHAUL 7. Install: • Clutch dished plate seat "1" • Clutch dished plate "2" • Friction plate 2 • Clutch plates • Friction plates 3 • Friction plate 1 (see fig. 86) • Recommended lubricant • Engine oil • Install the clutch dished plate seat and the clutch dished plate as shown in the figure.
Page 85
ENGINE OVERHAUL 9. Adjust: • Clutch mechanism clearance Check that protrusion "a" on clutch control lever "1 " is aligned to reference "b" on the crankcase as shown in the figure, by manually pushing the clutch control lever in "c" direction until it stops.
ENGINE OVERHAUL GEARbOx sHAft Gearbox shaft and stop lever removal New = part to be replaced upon reassembly quen- Operation/parts to remove Quantity Remarks Clutch housing Gearbox transmission link Gearbox shaft Snap ring Gearbox shaft spring Stop lever Stop lever spring Oil seal Reverse removal procedure to install.
ENGINE OVERHAUL pRImARy dRIVE GEAR ANd bALANCE sHAft GEARs REmOVAL 1. slacken: • Primary drive gear nut "1" • Place the aluminium plate "a" between the balance shaft drive gear "2" and the balance shaft driven gear "3", then slacken the primary drive gear nut . 2. Unbend the lock washer tab. 3.
ENGINE OVERHAUL CRANkCAsE New = Crankcase separation part to be replaced upon reassembly quen- Operation/parts to remove Quantity Remarks Engine Cylinder head Cylinder/Piston Clutch housing Oil pump unit Gearbox shaft Starter motor Balance shaft gears Generator rotor Reverse removal procedure to install.
Page 96
ENGINE OVERHAUL Crankcase separation New = part to be replaced upon reassembly quen- Operation/parts to remove Quantity Remarks Chain cover timing chain Oil drain plug spring Engine oil filter Neutral switch snap ring spacer Right crankcase dowel pin Left crankcase Reverse removal procedure to install.
ENGINE OVERHAUL CRANkCAsE sEpARAtION 1. Remove: • Crankcase bolts • Gradually slacken each bolt of 1/4 turn at the time, as indicated in the sequence. 2. Rotate: • Gear selector drum section • Rotate the gear selector drum section "1" to the position shown in the figure. In this position, the gear selector drum section teeth do not touch the crankcase during crankcase separation.
ENGINE OVERHAUL bEARING stOp INstALLAtION 1. Install: • Bearing stop "1" (see fig. 106) • Install the bearing stop "1" with the reference "OUT" "a" facing outside. • Apply the threadlock (LOCTITE®) on the bearing stop bolt threadings. • bearing stop bolt 7 Nm (0.7 mkg, 5.1 ft-lb) LOCtItE® CRANkCAsE AssEmbLy 1. Accurately wash all gaskets and crankcase mating surfa- ces.
Page 101
ENGINE OVERHAUL CRANkCAsE AssEmbLy • Gradually tighten each bolt of 1/4 turn at the time, as indicated in the sequence. • M6x70 MM:"7-9", "11" • M6x55 MM:"14","15" • M6x45 MM:"1-5", "10" • A. LEFT CRANkCASE • B. RIGHT CRANkCASE Part. N. 8000 H4704 (07-2010) F1.65...
Page 102
ENGINE OVERHAUL CRANksHAft New = part to be replaced upon reassembly quen- Operation/parts to remove Quantity Remarks Crankcase balance shaft Crankshaft F1.66 Part. N. 8000 H4704 (07-2010)
ENGINE OVERHAUL CRANksHAft CHECk 1. measure: • Crankshaft misalignment Not conforming to specifications Replace crankshaft, the bearing or both. • Slowly rotate the crankshaft. • Offset limit C 0.030 mm (0.0012 in) 2. measure: • Connecting rod big end side clearance Not conforming to specifications Replace crankshaft. •...
ENGINE OVERHAUL tRANsmIssION CHECk 1. measure: • Primary shaft misalignment (use a centre square and a dial gauge "1") • Not conforming to specifications Replace the primary shaft. (see fig. 116) • Input shaft offset limit 0.08 mm (0.0032 in) 2. measure: • Output shaft misalignment (use a centre square and a dial gauge "1") •...
ENGINE OVERHAUL PRIMARY SHAFT AND OUTPUT SHAFT ASSEMBLY 1. Install: • Safety washer "1" • Snap ring "2" (see fig. 119) • Make sure of installing a snap ring with the sharp side "a" fa- cing towards the opposite direction of the washer and gear. • Make sure that the ends of the snap ring "b" correspond to the grooves of the splined shaft "c". 2. Install: • Sprocket of 2a "1" • Push the second sprocket inside the primary shaft "2", as shown in the figure. • Mounting depth "a" 106.85-107.05 mm (4.207-4.215 in) GEAR SELECTOR FORKS AND GEAR SELECTOR DRUM UNIT INSTALLATION 1.
Page 109
MAINTENANCE Section Part. N. 8000 H4704 (07-2010) F2.1...
MAINTENANCE INTRODUCTION • This chapter includes all information necessary to perform recommended inspections and adjustments. • Complying with these preventive maintenance procedures will ensure higher reliability and a long life of the vehicle while also minimising the need for costly overhaul interventions. This information applies to both vehicles in use or brand new ones being prepared for sale.
MAINTENANCE VALVE CLEARANCE ADJUSTMENT • The following procedure applies to all valves. • Valve clearance shall be adjusted with cold engine, at ambient temperature. • When measuring or adjusting valve clearance, the piston shall be set at Top Dead Centre (TDC) during the compres- sion stroke.
Page 113
MAINTENANCE Measure valve clearance using a feeler gauge. (see fig.04) Not conforming to specs Adjust. Adjust: • Valve clearance Loosen check nut " 1 " . Fit the blade of a feeler gauge " 2" in-between the adjuster screw end and the valve stem tip. (see fig. 05) Turn adjuster screw " 3" in direction "a" or "b" until obtaining the specified valve clearance. (see fig. 06) • Direction "a": Valve clearance increases. • Direction "b": Valve clearance decreases. • Hold the adjuster screw in place and tighten the check nut as specified.
Page 114
MAINTENANCE Install: • Crankshaft end access screw (together with O-ring ) • Timing mark access screw (together with O-ring ) Install: • Cylinder head cover gasket. • Cylinder head cover • Spark plug lnstall: • Ignition coil " 4" • Ignition coil bolt: 7 Nm (0.7 m ·kg, 5.1 ft-lb) •...
MAINTENANCE Remove: • Digital rev meter • Stroboscopic lamp Install: • Timing mark access screw (together with O-ring) MEASURING COMPRESSION PRESSURE • An insufficient compression pressure would negatively affect performance. Measure: • Valve clearance • Not conforming to specs Adjust. • Refer to " VALVE CLEARANCE ADJUSTMENT" on page 3-4.
MAINTENANCE If compression reading is higher than the maximum allowed va- lue, ensure there is no scale on cylinder head, on valve surface and piston crown. Scale Remove. If compression pressure is below minimum allowed value, pour one spoon of engine oil into spark plug bore and take measu- rement again. Refer to the table below. Compression pressure (applying oil to cylinder) Reading Diagnosis Value greater than the one measured with no Worn or damaged piston ring(s) Repair.
MAINTENANCE (see fig.14) • Type: SAE 10W-30, SAE 10W-40, SAE 15W-40, SAE 20W-40 or SAE 20W-50 • Recommended engine oil grade: API service type SG or higher, JASO standard MA WARNING! • Engine oil also lubricates the clutch; a wrong type of oil or chemical additives could lead to clutch slipping.
Page 119
MAINTENANCE • Engine oil drain plug " 2"; • O-ring " 3"; • Spring " 4"; • Engine oil filter " 5". (see fig.18) Drain: • Engine oil (fully, from crankcase). If the oil filter needs replacing, too, proceed as follows. Remove oil filter element cover "1" and oil filter element "2". Install a new O-ring "3". (see fig.19) Install the new oil filter element and oil filter element cover. • Oil filter element cover bolt: 10 Nm (1.0 mkg, 7.2 ft-lb) Check: • Engine oil filter. Dirty Clean. Install: • Engine oil filter; • Spring • O-ring; • Oil drain plug. •...
MAINTENANCE Check: • Engine oil level; • Refer to " ENGINE OIL LEVEL CHECK" • Check: • Engine oil pressure. Slightly loosen the oil level inspection plug " 1". (see fig.20) Start engine and let it idle until engine oil starts to filter through the oil level inspection plug. If engine oil does not come out after a minute, stop engine to avoid seizure. Check engine oil channels, the oil filter element and oil pump for damage or leaks. Refer to "OIL PUMP". Start engine after fixing the problem and check engine oil pres- sure again. Tighten the oil level inspection plug as specified. • Oil level inspection plug: 7 Nm (0.7 mkg, 5.1 ft-lb) CLUTCH CABLE CLEARANCE ADJUSTMENT Engine side Loosen check nut "...
ENGINE COOLING Section Part. N. 8000 H4704 (07-2010) F3.1...
Page 122
ENGINE COOLING Cool.: thermostat ............................F3.3 Cool.: water pump ............................F3.4 Cool.: thermostat check ..........................F3.5 Cool.: thermostat installation ........................F3.6 Cool.: water pump disassembly........................F3.7 Cool.: water pump check ..........................F3.8 Cool.: water pump assembly ........................F3.9 Cool.: water pump installation ........................F3.10 F3.2 Part.
Page 123
ENGINE COOLING thErmOstat New = thermostat removal part to be replaced upon reassembly quen- Operation/Parts to remove Quantity remarks Coolant temperature sensor connector Coolant temperature sensor Thermostat cover Thermostat Radiator inlet hose Reverse removal procedure to install. Part. N. 8000 H4704 (07-2010) F3.3...
Page 124
ENGINE COOLING WatEr PUmP New = Water pump removal part to be replaced upon reassembly quen- Operation/Parts to remove Quantity remarks It is not necessary to remove the water pump, unless coolant level is extremely low or coolant contains some engine oil.
Page 125
ENGINE COOLING thErmOstat ChECK Check: • Thermostat Does not open at 80.5-83.5 °C (176.9-182.3 °F) Replace. (see fig.01) Keep thermostat " 1" in a vessel "2" containing water. Slowly warm up the water " 3". Dip a thermometer " 4" in water. Stir water, then look at the thermostat and thermometer reading.
ENGINE COOLING thErmOstat INstaLLatION Install: • Thermostat. Install the thermostat with breather hole "a" facing up. (see fig.03) Install; • Copper washer. • Coolant temperature sensor. • Coolant temperature sensor: 18 Nm (1.8 mkg, 13 ft-lb) WarNING! • Pay utmost attention when handling the coolant temperature sensor. • Change any part that has fallen or suffered a strong impact.
Page 127
ENGINE COOLING WatEr PUmP dIsassEmBLy New = Water pump disassembly part to be replaced upon reassembly quen- Operation/Parts to remove Quantity remarks Water pump housing cover Water pump housing cover gasket Impeller shaft retainer Impeller shaft Water pump housing plate Water pump housing seal Water pump seal Bearing...
Page 128
ENGINE COOLING WatEr PUmP dIsassEmBLy remove: • Water pump seal " 1". • remove the water pump seal from inside the water pump housing "2". (see fig.04) remove: • Bearing "1" • remove the bearing from outside the water pump housing "2".
Page 129
ENGINE COOLING WatEr PUmP assEmBLy Install: • Water pump seal " 1" UBI (inside water pump housing "2") • Install water pump seal using the suitable tools. WarNING! • Never lubricate the water pump seal surface with oil or grease. •...
Page 130
ENGINE COOLING • Before installing the impeller shaft retainer, lubricate the slit on impeller shaft end with a thin layer of lithium soap-base grease. • Install water pump housing seal, water pump housing plate and impeller shaft retainer as shown. •...
CARBURETTOR Section Part. N. 8000 H4704 (07-2010) F4.1...
Page 132
CARBURETTOR CARBURETTOR F4.2 Part. N. 8000 H4704 (07-2010)
Page 133
CARBURETTOR CARBURETTOR DISASSEMBLY 1. Remove: • floater pin "1" • needle valve "2" • floater "3" • NOTE: Take out the floater pin in the direction shown by the arrow. CARBURETTOR CHECK 1. Check: • carburettor body • float chamber • jet block Cracks/damage Replace 2. Check: • fuel passages • Obstruction Clean. Flush carburettor with a petroleum-base solvent. Do not use corrosive detergent solutions.
Page 134
CARBURETTOR 8. Check: • jet needle "1" • main jet "2" • needle jet support "3" • idle jet "4" • idle screw "5" • needle jet "6" Deformation/damage/wear Change Obstruction Clean Blow jets clean with compressed air. 9. Check: • piston valve movement Insert piston valve into carburettor body and move it up and down. Sealing Change piston valve. 10. Check: • fuel hoses Cracks/damage/wear Change. Obstruction Clean. Blow hoses clean with compressed air. CARBURETTOR ASSEMBLY WARNING! • Before assembling the carburettor, wash all parts with a petroleum-base solvent. •...
Page 135
CARBURETTOR 3. Install: • float chamber rubber seal • float chamber • idle air screw • Idle air screw loosened by ..turns. 4. Install: • accelerator pump assembly 5. Install: • enricher assembly in release stage CARBURETTOR INSTALLATION 1. Install: • carburettor NOTE: Align protruding part "a" on carburettor to chamfer "b" on intake manifold. 2. Adjust: • idle speed • Idle speed 1750 +/- 50 rpm. 3. Adjust: • accelerator cable clearance Part. N. 8000 H4704 (07-2010) F4.5...
Page 136
CARBURETTOR F4.6 Part. N. 8000 H4704 (07-2010)