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Owner'S Manual

Yamaha DT125E 1977, Owner'S Manual

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Summary of Contents for DT125E 1977

Page 1: ...YAMAHA DT125E DT175E OWNER S MANUAL 2A6 28199 10...

Page 2: ...ocedures easier or clearer CAUTION A CAUTION indicates special procedures that must be fol lowed to avoid damage to the machine WARNING A WARNING indicates special procedures that must be followed to...

Page 3: ...MPLETELY BEFORE OPERA TING YOUR NEW MACHINE This manual will provide you with a good basic under standing of the features operation and basic maintenance and inspection items of this vehicle If you ha...

Page 4: ...CHINE IDENTIFICATION 2 CONTROL FUNCTIONS 3 PRE OPERATION CHECKS 10 OPERATION AND IMPORTANT RIDING POINTS 12 PERIODIC MAINTENANCE AND MINOR REPAIR 18 CLEANING AND STORAGE 45 MISCELLANEOUS 47 WARRANTY I...

Page 5: ...10 Taillight Muffler Kick crank Headlight Front fender Front wheel Brake pedal Footrest Front fork Fuel tank 11 12 13 14 15 Rear wheel Side stand Change pedal Clutch lever Speedometer 16 Tachometer 1...

Page 6: ...Frame serial number Engine serial number The engine serial number is stamped into the raised part of the right rear section of the en gine NOTE The first three digits of these numbers are for model i...

Page 7: ...ble Not possible Hendlebar switches The handlebar switches are located near the right and left handle grips and are used for the following functions ENGINE STOP switch Make sure that the engine stop s...

Page 8: ...he horn TURN switch This is a three way switch the center position is off turn to the L position for the left flasher and to the R position for the right flasher Indicator lights TURN indicator light...

Page 9: ...h O N Oil caution light does not come on Disconnected circuit short ciruit faulty caution light bulb etc Oil caution light comes on Motorcycle in gearl Ask Yamaha dealer Oil caution light to inspect c...

Page 10: ...the carburetor Normal riding is done with the lever in this position RES This indicates RESERVE If you run out of fuel while riding move the lever to this position THEN FILL THE TANK AT THE FIRST OPP...

Page 11: ...starting Steering lock To lock the steering turn the handlebars to the right insert the key into the steering lock and turn the key about 1 8 turn counter clockwise Then push the key in and turn it ab...

Page 12: ...er is located on the right handlebar Pull it toward the handlebar to activate the front brake 1 Front brake lever Rear brake pedal The rear brake pedal is on the right side of the motorcycle Press dow...

Page 13: ...ver to the handlebar to disen gage the clutch and release the lever to engage the clutch The lever should be pulled rapidly and released slowly for smooth operation Gear shifting The gear ratios of th...

Page 14: ...evel top up as required Check oil level Fill before every trip Check alignment adjustment lubrication Check for proper throttle and autolube cable operation Check pressure runout spoke tighteness axle...

Page 15: ...l Make sure the transmission oil is at the specified level Add oil as necessary 1 Recommended oil Yamalube 4 cycle or type SE motor oil Oil quantity 650 50cc 22 1 1 7 3AE 10W 30 oz Tires Check the tir...

Page 16: ...witches and lights Check for proper operation 1 OPERATION AND IMPORTANT RIDING POINTS CUATION Before riding this motorcycle become thoroughly familiar with all operat ing controls and their function C...

Page 17: ...To see whether or not the engine is warm see if it responds to throttle normally with the star ter jet choke turned off 1 CAUTION See Break in Section prior to operating engine for the first time Shif...

Page 18: ...fully read the fol lowing material Because the engine is brand new you must not put an excessive load on it for the first several hours of running During the first 400 km 250 mi the various parts in t...

Page 19: ...xcess of 7 000 rpm Vary speeds occasionally CAUTION If any engine trouble should oc cur during the break in period consult your Yamaha dealer immediately Going uphill When starting to climb a gentle g...

Page 20: ...st method and the one most universally used is to use both engine com pression downshifting through the gears as the machine slows and the front and rear brakes When stopping gradually apply the rear...

Page 21: ...ed load and throttle condi tions such as those encountered on open highways cruise at 3 4 throttle Always bear in mind though the maximum allowable speed limit for the area through which you are ridin...

Page 22: ...on the following pages CAUTION motorcycle If the owner is not familiar with service this done by a Yamaha dealer work should be Tool Kit The servicing information included in this manual is intended...

Page 23: ...Reapir as required Check pressure Wear Balance Runout Clean Flush tank as required Check Adjust Air bleeding Top up Check specific gravity and breather pipe Adjust Clean or replace as required Check o...

Page 24: ...ghtly Apply lightly Apply very lightly DT125E Type Recommended lubricants 1 Yamalube 4 cycle oil 2 SAE 10W 30type SE motor oil Yamaha chain and cable lube or SAE 10W 30 motor oil Lithium base grease Y...

Page 25: ...er where the normal temperature is below 0 C 32 F and oil does not flow as well In such areas consult your Yamaha dealer NOTE Install the oil tank filler cap and push it fully into the filler 1 Oil ta...

Page 26: ...cycle oil or SAE 10W 30 motor oil type SE During the break in period you should re place the transmission oil 30 days or 800 km 500 mi after the date of first use The transmission should be drained a...

Page 27: ...tion problem for that cylinder Do not attempt to diagnose such problems yourself Instead take the machine to your Yamaha dealer You should periodically remove and inspect the spark plug because heat a...

Page 28: ...4ft lb Air filter The air filter protects the engine from dirt which can enter with the intake air and cause rapid engine wear This dirt is filtered from the air by the air filter element 1 Removal a...

Page 29: ...se 4 The air filter element should be cleaned once a month or every 1 600 km 1 000 mi It should be cleaned more often if the ma chine is operated in dusty or wet areas CAUTION The without excessive re...

Page 30: ...p is complete Tighten or loosen the throttle stop screw as required to obtain the specified engine r p m while watching the tachometer Standard idling r p m DT125E 1 450 1 550 r p m DT175 E 1 300 1 40...

Page 31: ...cknut is tightened firmly When it is impossible to make an adjustment at the clutch lever ask a Yamaha dealer for mecha nism adjustment 1 Adjuster 2 locknut Front brake adjustment Front brake should b...

Page 32: ...sen the locknut and adjust the pedal height by turning the adjuster 1 Adjuster 2 Locknut After adjusting check for correct rear brake play and brake light operation Do not forget to tighten the locknu...

Page 33: ...hole on the brake shoe plate and check the thickness of the lining If worn out ask your Yamaha dealer to install a new set of brake shoe Be sure to replace the plug properly so water cannot enter the...

Page 34: ...ause the O ring to become unseated resulting in fuel leakage Drive chain tension check Inspect the drive chain with both tires touching the ground Check the tension at the position shown in the illust...

Page 35: ...several revolutions and check tension several times to find the tightest point Adjust chain tension with rear wheel in this tight chain position 1 Chain puller cam 2 Axle nut 3 Cotter pin 5 Tighten t...

Page 36: ...First remove dirt and mud from the chain with a brush or cloth and then spray the lubricant between both rows of side plates and on all center rollers This should be performed every 400 km 250 mi or w...

Page 37: ...ont wheel axle the wheel assembly can now be removed Front wheel installation When installing front wheel reverse the removal procedure taking care of the follow ing points 1 Check for proper engageme...

Page 38: ...4 ft lb d Adjust the play in the brake lever Front fork oil change 1 Elevate front wheel by placing a suitable stand under the engine 2 Remove cap bolts from inner fork tubes 3 Place container under e...

Page 39: ...heavier for more damping 7 After filling slowly pump the fork tubes up and down to distribute the oil NOTE Adjust the oil levels in both right and left front forks so they are even 8 Inspect O ring o...

Page 40: ...e the cotter pins left and right Then remove the clevis pins 6 Pull the wheel backward remove the rear wheel assembly 1 Cotter pin 2 Plain washer 3 Clevis pin Rear wheel installation The rear wheel ca...

Page 41: ...e chain adjustment 5 Adjust both brake pedal and brakelight switch 6 Always use NEW cotter pins Rear shock Monocross suspension De Carbon system WARNING READ CAREFULLY This shock absorber contains hig...

Page 42: ...der wall at a point 10 15 mm 2 5 3 5 in above the bottom of the cylinder CAUTION Wear eye protection to pre vent eye damage from escaping gas and or metal chips 10 15mm 2 5 3 5 in 2 3mm 1 16 1 8in 0 W...

Page 43: ...just ment is suitable NOTE Make the adjustment by rotating the adjuster by 1 2 turn each time Adjusting Position Turn s Hard 4 I 3 I 2 2 1 1 2 1 1 1 2 STD Soft 1 2 1 2 1 1 Special wrench 4 Tighten the...

Page 44: ...grease to cut down friction See lubrication chart After the installation check to see that the throttle grip moves smothly Lubrication of levers pedals etc 1 Lubricate the pivoting parts of the brake...

Page 45: ...ked at least once a month 1 The level should be between the upper and lower level marks Use only distilled water if refilling is necessary 1 Upper level 2 Lower level NOTE Normal tap water contains mi...

Page 46: ...connected and is not damaged or obstructed Fuse replacement If the fuse is blown turn off the ignition switch and the switch in the circuit in question and install a new fuse of proper amperage Then t...

Page 47: ...e skilled technicians at your Yamaha dealer provide excellent service For replacement parts use only genuine Yamaha Parts Imita tion parts are similar in shape but often inferior in quality of materia...

Page 48: ...ean fuel petcock 2 Compression Some fuel No fuel Turn the fuel petcock to RES Supply fuel Restart engine 1 Kick the kick lever to see if there is compression f There is compression Compression normal...

Page 49: ...e pressure to do the job CAUTION Excessive hose pressure may cause water seepage and contamination of wheel bearings front forks brake drums and transmission seals Many expensive repair bills have res...

Page 50: ...es thoroughly and drain off excess oil Re install tank 3 Remove spark plug pour about one tablespoon of 10W to 30W oil in spark plug hole and re install spark plug Kick engine over several times with...

Page 51: ...s of the braking system The information presented represents results obtainable by skilled drivers under controlled road and vehicle conditions and the information may not be correct under other condi...

Page 52: ...d and vehicle conditions and the information may not be correct under other conditions Description of vehicles to which this table applies Yamaha motorcycle DT125E DT175E Summary table Low speed pass...

Page 53: ...n requirements which you must meet in order to qualify for warranty coverage FIRST your new Yamaha must be operated and maintained properly as explained in this manual If you have any questions about...

Page 54: ...ur new Yamaha O The Yamaha Owner s Warranty Guide is to be supplied by your Yamaha dealer at the time of purchase If you did not receive one or have lost yours you may obtain extra copies upon request...

Page 55: ...um turning radius Climbing ability ENGINE Type Engine model Cylinder Displacement DT125E 2 095 mm 82 5 in 865 mm 34 1 in 1 120 mm 44 1 in 1 350 mm 53 1 in 265 mm 10 4 in 96 kg 212 1b 2 000 mm 78 in 30...

Page 56: ...uretor Air cleaner TRANSMISSION Primary reduction system Primary reduction ratio DT125E 5 6 x 5 0 mm 2 2 x 1 9 in 7 2 Primary kick Magneto 7 0 lit 7 4 qt 1 0 lit 1 0 qt Separate lubrication Yamaha Aut...

Page 57: ...ary reduction ratio STEERING Caster Trail TIRE SIZE Front Rear SUSPENTION Front Rear 35 10 31 14 28 18 25 21 22 23 20 25 Chain 49 15 DT125E 3 500 2 214 1 556 1 190 0 957 0 800 3 267 H 49 16 30 126 mm...

Page 58: ...AL Headlight Flasher light Tail stop light Indicator light TURN NEUTRAL OIL HIGH BEAM Meter lights DT125E DT175E Coil spring oil damper Coil spring Gas oil damper Tubular double cradle 6V 35 35W 6V 17...

Page 59: ......

Page 60: ...YAMAHA MOTOR CO LTD IWATA JAPAN LIT 11626 00 70 PRINTED IN JAPAN 77 2 5 0 X 2 0...

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