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EB000000TDM850 ’96SERVICE MANUAL 1996 by Yamaha Motor Co., Ltd.First edition, March 1996All rights reserved. Any reproduction orunauthorized use without the writtenpermission of Yamaha Motor Co., Ltd.is expressly prohibited.

NOTICEThis manual was written by the Yamaha Motor Company primarily for use by Yamaha dealers and theirqualified mechanics. It is not possible to put an entire mechanic’s education into one manual, so it is assumed that persons using this book to perform maintenance and repairs on Yamaha motorcycles have abasic understanding of the mechanical concepts and procedures inherent in motorcycle repair technology.Without such knowledge, attempted repairs or service to this model may render if unfit to use and/or unsafe.Yamaha Motor Company, Ltd. is continually striving to improve all models manufactured by Yamaha. Modifications and significant changes in specifications or procedures will be forwarded to all Authorized Yamahadealers and will, where applicable, appear in future editions of this manual.PARTICULARY IMPORTANT INFORMATIONThis material is distinguished by the following notation.The Safety Alert Symbol means ATTENTION! BECOME ALERT! YOURSAFETY IS INVOLVED!WARNINGCAUTION:NOTE:Failure to follow WARNING instructions could result in severe injury ordeath to the motorcycle operator, a bystander, or a person inspecting orrepairing the motorcycle.A CAUTION indicates special precautions that must be taken to avoiddamage to the motorcycle.A NOTE provides key information to make procedures easier or clearer.

EB002000HOW TO USE THIS MANUALMANUAL ORGANIZATIONThis manual consists of chapters for the main categories of subjects. (See “Illustrated symbols”)1st title 1 : This is the title of the chapter with its symbol in the upper right corner of each page.2nd title 2 : This title indicates the section of the chapter and only appears on the first page of each section.It is located in the upper left corner of the page.3rd title 3 : This title indicates a sub-section that is followed by step-by-step procedures accompanied bycorresponding illustrations.EXPLODED DIAGRAMSTo help identify parts and clarify procedure steps, there are exploded diagrams at the start of each removaland disassembly section.1. An easy-to-see exploded diagram 4 is provided for removal and disassembly jobs.2. Numbers 5 are given in the order of the jobs in the exploded diagram. A number that is enclosed by acircle indicates a disassembly step.3. An explanation of jobs and notes is presented in an easy-to-read way by the use of symbol marks 6 . Themeanings of the symbol marks are given on the next page.4. A job instruction chart 7 accompanies the exploded diagram, providing the order of jobs, names ofparts, notes in jobs, etc.5. For jobs requiring more information, the step-by-step format supplements 8 are given in addition to theexploded diagram and the job instruction chart.21436857

EB0030001GENINFO32ILLUSTRATED SYMBOLSSPECIllustrated symbols 1 to 9 are printed on topright of each page and indicate the subject of eachchapter.4INSPADJENG56COOLCARB7123456789General informationSpecificationsPeriodic inspections and adjustmentsEngineCooling CHASELEC10Illustrated symbols 10 to 17 are used to identifythe specifications appearing in the 2124222325Can be serviced with engine mountedFilling fluidLubricantSpecial toolTorqueWear limit, clearanceEngine speedΩ, V, AIllustrated symbols 18 to 23 in the exploded diagrams indicate the types of lubricants and lubrication points.181920212223Apply engine oilApply gear oilApply molybdenum disulfide oilApply wheel bearing greaseApply lightweight lithium soap base greaseApply molybdenum disulfide greaseIllustrated symbols 24 to 25 in the exploded diagrams indicate where to apply a locking agent 24and when to install new parts 25 .24 Apply locking agent (LOCTITE )25 Replace

INDEXGENERAL INFORMATIONSPECIFICATIONSPERIODIC INSPECTION ANDADJUSTMENTENGINE OVERHAULCOOLING TG9

GENINFOCHAPTER 1.GENERAL INFORMATIONMOTORCYCLE IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FRAME SERIAL NUMBER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ENGINE SERIAL NUMBER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .MODEL LABEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-11-11-11-1IMPORTANT INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .PREPARATION FOR REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ALL REPLACEMENT PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .GASKETS, OIL SEALS, AND O-RINGS . . . . . . . . . . . . . . . . . . . . . . . . . .LOCK WASHERS/PLATES AND COTTER PINS . . . . . . . . . . . . . . . . . .BEARINGS AND OIL SEALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .CIRCLIPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-21-21-21-21-31-31-3CHECKING OF CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4HOW TO USE THE CONVERSION TABLE . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5SPECIAL TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

GENINFO

MOTORCYCLE IDENTIFICATIONGENINFOEB100000GENERAL INFORMATIONMOTORCYCLE IDENTIFICATIONVEHICLE IDENTIFICATION NUMBERThe vehicle identification number 1 is stampedinto the right side of the steering head.NOTE:The vehicle identification number is used to identify the motorcycle and may be used to register themotorcycle with a licensing authority.EB100030ENGINE SERIAL NUMBERThe engine serial number 1 is stamped into thecrankcase.NOTE:The first three digits of the engine serial numberindicate the model type; the remaining digits arethe unit production number.MODEL LABELThe model label 1 is affixed to the frame. This information will be needed to order spare parts.1-1

IMPORTANT INFORMATIONGENINFOIMPORTANT INFORMATIONPREPARATION FOR REMOVAL1. Remove all dirt, mud dust, and foreign materialbefore removal and disassembly.2. Use proper tools and cleaning equipment.Refer to “SPECIAL TOOLS”.3. When disassembling the motorcycle keepmated parts together. This includes gears, cylinders, pistons, and other mated parts thathave been “mated” through normal wear.Mated parts must be reused as an assembly orreplaced.4. During the motorcycle disassembly, clean allparts and place them in trays in the order of disassembly. This will speed up assembly timeand help assure that all parts are correctly reinstalled.5. Keep away from fire.ALL REPLACEMENT PARTS1. Use only genuine Yamaha parts for all replacements. Use oil and/or grease recommendedby Yamaha for assembly and adjustment. Other brands may be similar in function and appearance, but inferior in quality.GASKETS, OIL SEALS, AND O-RINGS1. All gaskets, seals and O-rings should be replaced when an engine is overhauled.All gaskets surfaces, oil seal lips and O-ringsmust be cleaned.2. Properly oil all mating parts and bearing duringreassembly. Apply grease to the oil seal lips.1-2

IMPORTANT INFORMATIONGENINFOLOCK WASHERS/PLATES AND COTTER PINS1. All lock washers/plates 1 and cotter pinsmust be replaced when they are removed.Lock tab(s) should be bent along the bolt or nutflat(s) after the bolt or nut has been properlytightened.BEARINGS AND OIL SEALS1. Install the bearing(s) and oil seal(s) with theirmanufacturer’s marks or numbers facing outward. (In other word, the stamped letters mustbe on the side exposed to view.) When installing oil seal(s), apply a light coating of lightweight lithium base grease to the seal lip(s). Oilthe bearings liberally when installing.1 Oil sealCAUTION:Do not use compressed air to spin the bearings dry. This causes damage to the bearingsurfaces.2 BearingCIRCLIPS1. All circlips should be inspected carefully beforereassembly. Always replace piston pin clips after one use. Replace distorted circlips. Wheninstalling a circlips 1 , make sure that the sharpedged corner 2 is positioned opposite to thethrust 3 it receives. See the sectional view.4 Shaft1-3

CHECKING OF CONNECTIONSGENINFOCHECKING OF CONNECTIONSDealing with stains, rust, moisture, etc. on the connector.1. Disconnect: Connector2. Dry each terminal with an air blower.3. Connect and disconnect the connector two orthree times.4. Pull the lead to check that it will not come off.5. If the terminal comes off, bend up the pin 1and reinsert the terminal into the connector.6. Connect: ConnectorNOTE:The two connectors “click” together.7. Check for continuity with a tester.NOTE: If there is no continuity, clean the terminals. Be sure to perform the steps 1 to 7 listed abovewhen checking the wireharness. For a field remedy, use a contact revitalizer available on the market. Use the tester on the connector as shown.1-4

HOW TO USE THE CONVERSION TABLECONVERSION TABLEHOW TO USE THE CONVERSIONTABLEMETRIC TO IMPERIALAll specification data in this manual are listed in SIand METRIC UNITS.Use this table to convert METRIC unit data to IMPERIAL unit data.Ex.METRIC**mm 2 mm MULTIPLIER0.03937 0.03937 GENINFOMetric unit Multiplier Imperial unitIMPERIAL**in0.08 .39370.03937miftydininVolume/Capacitycc (cm3)cc (cm3)lit (liter)lit (liter)0.035270.061020.87990.2199oz (IMP liq.)cuSinqt (IMP liq.)gal (IMP de 9/5 32( C)lb/inpsi (lb/in2)Fahrenheit( F)

SPECIAL TOOLSGENINFOSPECIAL TOOLSThe proper special tools are necessary for complete and accurate tune-up and assembly.Using the correct special tool will help prevent damage caused by the use of improper tools or improvisedtechniques. The shape and part number used for the special tool differ by country, so two types are provided. Refer to the list provided to avoid errors when placing an order.Tool No.90890-0108390890-01084Tool name/How to useSlide hammer boltWeightThese tools are used to remove themain axle assembly cover.90890-01304Piston pin pullerThis tool is used to remove the pistonpin.90890-01312Fuel level gaugeThis gauge is used to measure the fuellevel in the float chamber.90890-0132590890-01352Radiator cap testerAdapterThis tester is needed for checking thecooling system.90890-0136290890-01382Flywheel pullerCrankshaft protectorThese tools are used to remove the A.C.magneto.90890-0136790890-01374Fork seal driver weightAdapterThese tools are used when installing thefork seal.90890-0132690890-01465T-handleDamper rod holderThese tools are used to loosen andtighten the front fork damper rodholding bolt.90890-01403Ring nut wrenchThis tool is used to loosen and tightenthe steering ring nut.1-6Illustration

SPECIAL TOOLSTool No.Tool name/How to use90890-01701Sheave holder90890-03081This tool is used to hold the rotor whenloosening and tightening the rotor bolt.Compression gauge90890-03094This gauge is used to measure theengine compression.Vacuum gauge90890-03112This gauge is needed for carburetorsynchronization.Pocket tester90890-03113This instrument is invaluable forchecking the electrical system.Engine tachometer90890-03141This tool is needed for detectingengine rpm.Timing light90890-04016This tool is necessary for checkingignition timing.Valve guide remover, installer andreamer (5.5 mm)90890-0401990890-04108These tools are used to remove, installand rebore the valve guide.Valve spring compressorAttachment90890-04086These tools are needed to remove andinstall the valve assemblies.Universal clutch holder90890-06754This tool is used to hold the clutch whenremoving or installing the clutch bossnut.Ignition checkerThis instrument is necessary forchecking the ignition system components.1-7GENINFOIllustration

SPECIAL TOOLSTool No.90890-85505Tool name/How to useYamaha bond No. 1215This sealant (bond) is used on crankcasemating surfaces, etc.1-8GENINFOIllustration

SPECCHAPTER 2.SPECIFICATIONSGENERAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1MAINTENANCE SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .CHASSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ELECTRICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-42-42-112-15GENERAL TORQUE SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17LUBRICATION POINT AND GRADE OF LUBRICANT . . . . . . . . . . . . . . . . 2-18ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18CHASSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19LUBRICATION DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20CABLE ROUTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25

SPEC

GENERAL SPECIFICATIONSSPECSPECIFICATIONSGENERAL SPECIFICATIONSItemStandardModel:TDM850Model code:4TX1Dimensions:Overall lengthOverall widthOverall heightSeat heightWheelbaseMinimum ground clearanceMinimum turning radius2,165 mm, 2,200 mm (D, DK, SF, N, S)790 mm1,285 mm805 mm1,475 mm165 mm2,900 mmBasic weight (With oil and full fuel tank): 229 kgEngine:Engine typeCylinder arrangementDisplacementBore strokeCompression ratioCompression pressure (STD)Starting systemLiquid-cooled 4-stroke, DOHC, 5 valveForward-inclined parallel 2-cylinder0.849 L89.5 67.5 mm10.5 : 11,200 kPa (12 kg/cm2, 12 bar) at 300 r/minElectric starterLubrication system:Dry sumpOil type or grade:Engine oilAPI Standard:API SE or higher gradeOil capacity:Engine oilPeriodic oil changeWith oil filter replacementTotal amount3.5 L3.6 L4.2 L2-1

GENERAL SPECIFICATIONSItemStandardAir filter:Dry type elementFuel:TypeFuel tank capacityFuel reserve amountRegular unleaded gasoline20 L3.1 ISpark plug:TypeManufacturerSpark plug gapDPR8EA-9/X24EPR-U9NGK/NIPPONDENSO0.8 X 0.9 mmClutch type:Wet, multiple-discTransmission:Primary reduction systemPrimary reduction ratioSecondary reduction systemSecondary reduction ratioTransmission typeOperationGear ratio1st2nd3rd4th5thSpur gear67/39 (1.718)Chain drive42/17 (2.471)Constant mesh 5-speedLeft foot operation37/13 (2.846)37/20 (1.850)30/21 (1.429)27/23 (1.174)28/27 (1.037)Chassis:Frame typeCaster angleTrailDiamond24.5 103 earfrontrearTubeless110/80 ZR18150/70 M90X2-2

GENERAL SPECIFICATIONSItemStandardTire pressure (cold tire):Maximum load-except motorcycleLoading condition A*frontrearLoading condition B*frontrearHigh speed ridingfrontrearBrake:Front brakeRear braketypeoperationtypeoperation180 kg0 90 kg225 kPa (2.25 kg/cm2, 2.25 bar)275 kPa (2.75 kg/cm2, 2.75 bar)90 180 kg225 kPa (2.25 kg/cm2, 2.25 bar)275 kPa (2.75 kg/cm2, 2.75 bar)225 kPa (2.25 kg/cm2, 2.25 bar)275 kPa (2.75 kg/cm2, 2.75 kg/cm2)Dual disc brakeRight hand operationSingle disc brakeRight foot operationSuspension:Front suspensionRear suspensionTelescopic forkSwingarm (monocross)Shock absorber:Front shock absorberRear shock absorberCoil spring/Oil damperCoil spring/Gas-oil damperWheel travel:Front wheel travelRear wheel travel149 mm144 mmElectrical:Ignition systemGenerator systemBattery typeBattery capacityT.C.I. (digital)A.C. magnetoGT12B-412 V 10 AHHeadlight type:Quartz bulb (halogen)Bulb wattage quantity:HeadlightAuxiliary lightTail/brake lightFlasher lightMeter lightIndicator lightsNeutralTurnHigh beam12 V 55 W 212 V 5 W 112 V 5/21 W 212 V 21 W 412 V 3.4 W 112 V 1.7 W 212 V 3.0 W 112 V 3.4 W 112 V 3.4 W 112 V 3.4 W 1* Load is total weight of cargo, rider, passenger and accessories2-3SPEC

MAINTENANCE SPECIFICATIONSSPECMAINTENANCE SPECIFICATIONSENGINEItemStandardCylinder head:Warp limitCylinder:Bore sizeTaper limitOut of round limitIntakeExhaust 0.03 mm89.500 89.505 mm89.6 mm0.05 mm0.03 mm Camshaft:Drive methodCamshaft cap inside diameterCamshaft outside diameterCamshaft-to-cap clearanceCam ��LimitTiming chain (right)25.000 25.021 mm24.967 24.980 mm0.020 0.054 mm 35.95 36.05 mm27.95 28.05 mm7.9 8.1 mm35.95 36.05 mm27.95 28.05 mm7.9 8.1 mm35.85mm27.85mm 35.85 mm27.85 mm Camshaft runout limit Cam chain:Cam chain type/No. of linksCam chain adjustment method82RH2015/138Automatic 0.15 0.20 mm0.25 0.30 mm Valve, valve seat, valve guide:Valve clearance (cold)INEXValve dimensions:Head Dia“A” head diameter0.03 mmFace WidthINEXSeat Width25.9 26.1 mm27.9 28.1 mm2-4 Margin Thickness

MAINTENANCE SPECIFICATIONSItem“B” face width“C” seat width“D” margin thicknessStem outside diameterGuide inside diameterStem-to-guide clearanceStandardValve spring:Free lengthSet length (valve closed)Compressed pressure(installed)itTilt lilimitDirection of winding(top view)LimitINEXINEXINEXINEXINEXINEX2.06 2.46 mm2.06 2.46 mm0.9 1.1 mm0.9 1.1 mm0.8 1.2 mm0.8 1.2 mm5.475 5.490 mm5 460 5475 mm5.4605.4755.500 5.512 mm5.500 5.512 mm0.010 0.037 mm0.025 0.052 mmSSSSSSSSSSSSSSSSSSSSS5.445 mm5 43 mm5.435.55 mm5.55 mm0.08 mm0.10 mm0.01 mmINEX0.9 1.1 mm0.9 1.1 mm1.6 mm1.6 mmINEXINEX37.29 mm37.29 mm30.39 mm30.39 mm35.2 mm35.2 mmSSSSSS10.0 11.6 kg10 0 116 kgk10.011.6SSSSSSSSSSSS2.5 /1.7 mm2.5 /1.7 mmClockwiseClockwiseSSSSSSStem runout limitValve seat widthSPECINEXINEXINEX2-5

MAINTENANCE SPECIFICATIONSItemPiston:Piston to cylinder clearancePiston size “D”SPECStandardLimit0.065 0.085 mm89.420 89.435 mm0.15 mm 4.5 mm1 mmIN side20.002 20.013 mm19.991 20.000 mm 20.043 mm19.975 mmTypeDimensions (B T)End gap (installed)Side clearance (installed)2nd ring:Barrel1.0 3.5 mm0.30 0.45 mm0.035 0.070 mm 0.7 mm0.12 mmTypeDimensions (B T)End gap (installed)Side clearance (installed)Oil ring:Taper1.0 3.5 mm0.30 0.45 mm0.035 0.070 mm 0.8 mm0.12 mm2.00 2.85 mm0.2 0.7 mm 0.026 0.050 mm0.09 mmMeasuring point “H”Piston off-setPiston off-set directionPiston pin bore inside diameterPiston pin outside diameterPiston rings:Top ring:Dimensions (B T)End gap (installed)Connecting rod:Oil clearance2-6

MAINTENANCE 6 154.4 mm64.75 65.25 mm 0.160 0.272 mm0.8 1.0 mm0.020 0.038 mm 0.035 mm0.5 mm 0.1 mmBalancer:Balancer drive methodGear Clutch:Friction plate thicknessQuantityClutch plate thicknessQuantityWarp limitClutch spring free lengthQuantityClutch release method2.9 3.1 mm91.9 2.1 mm8 55 mm6Outer pull, rack & pinion pull2.8 mm 0.1 mm53 mm Transmission:Main axle deflection limitDrive axle deflection limit 0.08 mm0.08 mmShifter:Shifter typeGuide bar bending limitGuide bar 0.1 mm4TX 00#142.5#605EI85-2/3Y-2#701.40.9#450.80.90.82.0 Assembly width “A”Crank width “B”Runout limit “C”Big end side clearance “D”Small end free play “F”Journal oil clearanceCarburetor:I.D.markMain jetMain air jetJet needleNeedle jetPilot air jet 1Pilot air jet 2Pilot outletPilot jetBypass 1Bypass 2Bypass 3Pilot (P.J)(B.P.1)(B.P.2)(B.P.3)(P.S)2-7

MAINTENANCE SPECIFICAT

basic understanding of the mechanical concepts and procedures inherent in motorcycle repair technology. Without such knowledge, attempted repairs or service to this model may render if unfit to use and/or unsafe. Yamaha Motor Company, Ltd. is continually striving to improve all models manufactured by Yamaha. Modifi-

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