Baotian engine BT139QMA BT139QMB user's manual
Contents
1. open 0 BTDC Valve Intake 1mm vertical pe closed 25 ABDC presi 33 ABDC open fime Exhaust 1mm vertical e closed 2 BTDC Valve gap Cold state intake 0 06 mm exhaust 0 08 Idle speed r min 1900 Lubrication mode Both pressure and splash Oil pump Internal external rotors Oil filter strainer Lubrication device Camshaft Volume 900m chamber Mark SAEISW 40 Lubricant volume Volume 110 1 chamber Mark 85W 90 Cooling mode Forced air cooling Air filter Sponge Type Diaphragm carburetor Plunger diameter mm 16 Carburetor Venturi diameter mm 16 5 Throttle Butterfly valve Type CDI magneto ignition Ignition time 13 1700r min 28 3800r min Ignition Breaker Contactless device A7RTC A7RC Spark plug CR7HSA NGK CR6HSA NGK Spark plug gap 0 6 0 7 Clutch type Multiblock dry type 5 type Stepless Transmission Drive operation Automatic centrifugal transmission type Two stage reduction Speed red cer Reduction First stage 3 25 ratio Second stage 3 4 IIIL PRECAUTIONS IN DISASSEMBLING AND ASSEMBLING 1 Paper pad rubber seals such as O ring ring clip and elastic retainer must be replaced after disassembling 2 When tightening bolts and nuts tighten those of larger outside diameter before tightening those of smaller outside diameter lock t2. A Adjustment C Cleaning R Replacement T Tightening Table 4 Times Mileage Km Note Items 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 New e Zi vehicle R R R R R R ki R300 Engine Oil filter 5 New GearOil Note3 vehicle R R R300 1 Valve gap A A A A Carburetor I Cc a Air filter T CR M L Sy 8 C R ar 8 plug Drive belt LA Boits and 1 nuts j 1 1 1l 1 Please repeat maintenance in case mileage exceeds the specified ranges in the table Notes 2 Inspection and replacement should be effected in advance in dusty or rainy conditions 2 Please shorten replacement intervals in heavy load long riding or rainy conditions VI STANDARD SPARE PARTS VALUE AND LIMIT OF USE Items Standard value Limit of Measuring tool Name of spare parts mm Ee Serial No mm or equip Air gauge or Cylinder head valye A 1 5 0 5 012 5 03 outside micrometer 2 Intake valve diameter 4 975 4 99 4 92 Outside micrometer 3 Exhaust valve diameter 4 955 4 97 4 90 Outside micrometer 4 Swing arm shaft hole 10 0 10 022 10 1 micrometer 5 Swing arm shaft 9 987 9 972 9 91 ben micrometer 6 Cam height 6 1 Intake 25 745 0 03 25 345 Oude micrometer 62 Exhaust 25 55 0
3. DIFFERENCES BETWEEN 25km h AND 45km h ENGINE PARTS FOR BTS0QT BT49QT MOTORCYCLE The structure and principle of 25km h and 45km h engine for BTSOQT and BT49QT are of the same with only the following five different parts 1 Carburetor heat protecting pad 2 Inlet tube in air cleaner 3 Electronic igniter 4 Carburetor 5 Bushing ring between the left and right part of the driven gear Figures 25km h heat protection pad 45km h heat protection pad 25km h inlet tube 25km h igniter 45km h igniter 25km h left part of driven gear 45km h left part of driven gear 16
4. Ex INTAKE VALVE VALVE OUTER SPRING UPPER VALVE INNER SPRING LOWER oil passage SWING ARM SHAFT cam contacting face SWING ARM CAMSHAFT ASSY Clearance gauge Camshaft sprocket Small hole reticle Cylinder head face CHECK VALVE GAP WITH CLEARANCE GAUGE PISTON SKIRT PISTON PIN PISTON PIN HOLE CYLINDER INSIDE DIAMETER Inspect end gap PISTON RINGEND GAP CENTRIFUGAL ROLLER RIGHT PART OF DRIVEN GEAR OUTER CLUTCH ASSY NOTCH driven gear centrifugal block DRIVEN GEAR CENTRIFUGAL FRICTION PAD DRIVEN PULLEY NOTCH Vll ELECTRIC PARTS CONNECTION AND INSPECTION 25 km h IGNITER 45km h IGNITER STARTING RELAY Igniter Colour of wires blue white black yellow black white green green blaek red Minimum continuous 380r mi ignition rotational speed Range of speed of 380 11000r min rotation Initial rotational speed of a 1700 200r min 13 0 angle increase Terminal rotational T a 3600 200 speed of angle increase E blue yellow black green black white LI green black red Minimum continuous ignition rotational speed Range of speed of d rotation Initial rotational speed of angle increase Mgniter Colour of wires 380r min 380 11000r min 1700 200r min 13 0 Terminal rotational a 3
5. nut 45 6 6mm bolt nut 8 12 8mm bolt nut 18 20 10mm bolt nut 30 40 FF 12mm bolt nut 40 50 5mm screw 35 5 m 6mm screw SH bolt 7 11 pem flange bolt nut Seel 11 14 8mm flange bolt nut 20 30 9 10mm flange bolt nut 35 45 TORQUE VALUES OF IMPORTANT PARTS OF ENGINE See Table 3 Table 3 Serial n a Screw diameter Tightening number Tightening part 4 8 mm torque N m 1 Cylinder head bolt A 2 7 9 2 Cylinder head bolt B 2 7 9 3 Engine oil strainer cover 1 30 15 Exhaust pipe connector fixing 4 balt i 2 L 6 9 5 Camshaft seat flange nut 4 T 16 18 6 Valve adjusting screw 2 5 9 7 Chain stretching plate bolt 1 6 10 8 Oil drain bolt 2 8 10 12 9 Clutch outer disc setscrew nut 1 10 40 10 Magneto rotor setscrew nut 1 10 40 11 Left crankshaft nut 1 12 55 12 Spark plug 1 10 12 13 Engine oil pump driven gear 1 6 10 nut 14 Chain tensioner bolt M8 8 1 8 6 15 Rear transmission assembly 7 8 20 22 bolt 16 Brake shoe fitting shaft nut 1 8 10 17 Cylinder head cover vent 4 4 3 5 chamber cover screw V MAINTENANCE INTERVALS Table 4 Engine maintenance intervals are recorded in terms of mileage as is illustrated in I Inspection Effect cleaning lubrication replenishment modification or replacement when necessary
6. 03 25 15 micrometer 7 Reightokinnervaly 5 02 28 5 Square calliper spring 8 Heightofontervalve 344 493 32 Squar calliper spring 9 Intake valve gap 0 06 Clearance gauge 10 Exhaust valve gap 0 08 Clearance gauge 11 Spark plug gap 0 6 0 7 Clearance gauge e Air gauge or 12 39 0 39 01 39 1 outside diameter x micrometer 8 Y Outside 13 Piston skirt 38 99 38 97 38 93 x L micrometer 14 Piston pin hole 13 002 13 008 13 04 inside L micrometer 15 Outside diameter of 12 992 12 998 12 97 Outside piston pin micrometer 16 First piston ring gap 0 08 0 20 0 5 Clearance gauge 17 Second piston ring gap 0 05 0 20 0 5 Clearance gauge 18 Outside diameter of 16 0 08 15 5 Outside centrifugal roller micrometer 19 Hole diameter of right 20 009 20 027 20 06 Inside part of driven gear micrometer 30 Outside diameter of 19 965 49 98 19 04 Outside ___ driven gear bush _ _ micrometer 21 Driver belt face notch 0 4 Depiiaquare d calliper Inner diameter of outer b a 7 107 2 7 22 clutch assy 107 1 10 Square calliper Thickness of friction 23 disk of centrifugal 2 Square calliper _ block 24 Friction face of driven notch 04 Depth square gear belt E calliper 25 V belt width 18 175 16 Square calliper Vil SAPRE PARTS INSPECTION ILLUSTRATION bearing mounting seat VALVE BUSHING EXHAUST VAL
7. 600 200r min26 2 speed of angle increase Starting Relay Colour of wires green yellow yellow red Working Voltage DC 12V Load current 100A Sealing voltage 8A Release voltage 4 RECTIFIER HIGH VOLTAGE CAPACITOR Rectifier Colour of wires pink black green red yellow Performance of electric parts Charging voltage 14 5 0 5V with 47W load voltage tested output voltage 13 0 0 5V insulation resistance of input voltage terminal against cover 210319 DC250V earthometer High Voltage Capacitor Colour of wires black green Minimum Distance of three needles continuous ignition 6mm Running time gt 20s rotational speed 380r min e Distance of three needles maximum continuous ignition ional speed 6mm Running time2 20s 380 10000 min 14 IX ENGINE VOLUME INSPECTION The oil engine must be added with a certain amount of specified engine oil and the oil must be replaced periodly When inspecting engine oil quantity motorcycle must be placed on a level ground Inspect engine quantity when engine has run for 2 3 minutes and motorcycle has run for 2 3 minutes Measure engine oil quantity with oil depth gage When oil level is below the lower limit position add specified oil to bring oil level to the upper Figure engine oil upper limit engine oil lower limit X
8. BT139QMA BAOTIAN ENGINE pr1399MB USER S MANUAL JIANGMEN SINO HONGKONG BAOTIAN MOTORCYCLE INDUSTRIAL CO LTD II IV VI CONTENTS NUMBER LOCATION BASIC TECHNICAL SPECIFICATIONS PRECAUTIONS IN DISASSEMBLING AND ASSEMBLING TIGHTENING TORQUE VALUE MAINTENANCE INTERVAL STANDARD SPARE PARTS VALUE AND LIMIT OF USE SPARE PARTS INSPECTION ILLUSTRATION ELECTRIC PARTS CONNECTION AND INSPECTION ENGINE OIL VOLUME INSPECTION DIFFERENCES BETWEEN 25km h AND 45km h ENGINE PARTS FOR BT500T 8 490 MOTORCYCLE WORKING DIRECTIONS FOR BT139QMB ENGINE BT139QMB oil engine is the power for BTS0QT motorcycle For your convenience to use it we provide you with the following information of the engine CHAPTER ONE GENERAL INFORMATION I ENGING NUMBER LOCATION Engine number location is at the lower left front of left crankcase as illustrated in Figure 1 engine number location Figure 1 Il BASIC TECHNICAL SPECIFICATIONS See Table 1 Table 1 Starting mode Kick starting and electric starting Type Four strokes Number of cylinders Single Type of combustion chamber Hemispheric Valve structure Ua 0 chain transmission Cylinder bore X travel mm 39x 41 4 Total displacement mL N j 40 m Compression ratio 10 5 1 Maximum power Kw ay win 2 2 7500 Maximum torque Nim min 2 9 7000
9. hem in the order of diagonal lines at specified torques 3 Use parts and greases produced by regular factories Special tools or universal tools must be used in disassembling or assembling After disassembling parts must be inspected and cleaned and their friction faces lubricated before assembling The specified lubrication locations must be lubricated with specified lubricants After assembling parts confirm the state of locking or movement When two people are at work make sure that both are in safety in repair work When dismounting and mounting battery the terminal must be disconnected first 10 When using an open end wrench prevent slippage so as to prevent injury 11 At the completion of work confirm contacting points fixing points and passages 12 When connecting battery wires connect the terminal fist 13 At the completion of battery terminal connection apply grease to both terminals 14 When dismounting connectors press down lock before pulling wire 15 When pulling connectors hold connectors in hand instead of pulling wires only 16 Repair connectors when their terminals are bent protruding or disconnected 17 When connector terminals are rusty rub off rust before connecting them mea won IV TIGHTENING TORQUE VALUE STANDARD TORQUE VALUE REFER TO STANDARD TORQUE VALUE See Table 2 Table 2 Designation Tightening torque N m 5mm bolt
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