WARNING Indicates a strong possibility of severe personal injury or death if instructions are not followed. CAUTION: Indicates a possibility of equipment damage if instructions are not followed NOTE: Gives helpful information. service methods which could cause PERSONAL INJURY to service personnel or could damage a vehicle or render it unsafe. Please understand that those warnings could not cover all conceivable ways in which service whether or not recommended by manufacturer, might be done or of the possibly hazardous consequences of each conceivable way, nor could manufacturer investigate all such ways. Anyone using service procedures or tools, whether or not recommended by manufacturer, must satisfy himself thoroughly that neither personal safety nor vehicle safety will be jeopardized by the service methods or tools selected. HOW TO USE THIS MANUAL C O N T E N T S This service manual describes the service procedures for the Thumpstar Off Road Range GENERAL INFORMATION Follow the Maintenance Schedule (Section 3) recommendations to FRAME/BODY PANELS/ EXHAUST SYSTEM ensure that the vehicle is in peak operation condition and the emission levels are within the standards set by the California Air MAINTENANCE Resources Board. LUBRICATION SYSTEM Performing the first scheduled maintenance is very important. It compensates for the initial wear that occurs during the break-in period FUEL SYSTEM Sections 1 and 3 apply to the whole motorcycle. Section 2 illustrates ENGINE REMOVAL/ INSTALLATION what may be required to perform service described in the following sections. Section 4 through 14 describe parts of the motorcycle, CYLINDER HEAD/ VALVES grouped according to location. CYLINDER/PISTON Find the section you want on this page, then turn to the table of contents on the first page of the section. CLUTCH/GEARSHIFT LINKAGE Most sections have an assembly or system illustration , service ALTERNATOR/CAM CHAIN TENSIONER information and troubleshooting for the section. CRANKSHAFT/TRANSMISSION/KICKSTARTER The subsequent pages give detailed procedures. If you don't know the source of the trouble, go to section 16, troubleshooting CHASSIS FRONT WHEEL/BRAKE/SUSPENSION/STEERING ALL INFORMATION, ILLUSTRATIONS, DIRECTIONS AND SPECIFICATION REAR WHEEL/BRAKE/SUSPENSION INCLUDED IN THIS PUBLICATION ARE BASED ON THE LATEST PRODUCT INFORMATION AVAILABLE AT THE TIME OF APPROVAL FOR PRINTING. ELECTRICAL IGNITION SYSTEM THUMPSTAR MOTOR INC RESERVES THE RIGHT TO MAKE CHANGES AT ANY TIME WITHOUT NOTICE AND WITHOUT INCURRING ANY WIRING DIAGRAM OBLIGATION WHATEVER. NO PART OF THIS PUBLICATION MAY BE REPRODUCED WITHOUT WRITTEN PERMISSION. THIS MANUAL IS WRITTEN TROUBLESHOOTING FOR PERSONS WHO HAVE ACQUIRED BASIC KNOWLEDGE OF MAINTENANCE ON MANUFACTURER'S MOTORCYCLES, INDEX MOTOR SCOOTERS OR ATVS. SERVICE PUBLICATION OFFICE IMPORTANT SAFETY NOTICE Detailed descriptions of standard workshop procedures, safety principles and service operations are not included. It is important to note that this manual contains some warnings and cautions against some specific ENGINE AND DRIVE TRAIN
SYMBOLS The symbols used through out this manual show specific service procedures. If supplementary information is required it would be explained specifically in the text without the use of the symbols. Use molybdenum disulfide grease (containing more than 3% molybdenum disulfide,NLG#2 Example: Molykote BR-2 plus manufactured by Dow Corning, U. S. A. Multi-purpose M-2 manufactured by Mitsubishi oil, Japan Use molybdenum disulfide paste (containing more than 40% molybdenum disulfide, NLG#2 or equivalent). Example: Molykote G-N paste manufactured by Dow Corning, U.S.A. Manufacture Moly 610 (U.S.A. only) Rocol ASP manufactured by Rocol Limited, U.K. Rocol Paste manufactured by Sumico Lubricant, Japan. 1. GENERAL INFORMATION GENERAL SAFETY----------------------------1-1 TOOLS-----------------------------------------------------1-12 SERVICE RULES-------------------------------1-2 LUBRICATION & SEAL POINTS----------------------1-13 MODEL IDENTIFICATION--------------------1-3 CABLE &HARNESS ROUTING------------------------1-14 SPECIFICATIONS------------------------------1-4 EMISSION CONTROL SYSTEMS--------------------1-17 TORQUE VALUES-----------------------------1-10 GENERAL SAFETY CARBON MONOXIDE HOT COMPONENTS If the engine must be running to do some work ,make sure the area is well ventilated. Never run the engine WARNING in an enclosed area. Engine and exhaust system parts become very hot and remain hot for some time after the engine is run. Wear WARNING insulated gloves or wait until the engine and exhaust system The exhaust contains poisonous carbon monoxide have cooled before handing these parts. gas that can cause loss of consciousness and may lead to death. USED ENGINE OIL Run the engine in an open area or with an exhaust WARNING evacuation system in an enclosed area. Used engine oil may cause skin cancer if repeatedly left in contact with the skin for prolonged periods. Although GASOLINE this is unlikely unless you handle used oil on a daily Work in a well ventilated area. Keep cigarettes, flames basis, it is still advisable to thoroughly wash your hands or sparks away from the work area or where gasoline with soap and water as soon as possible after handling is stored. used oil. KEEP OUT OF REACH OF CHILDREN. WARNING Gasoline is extremely flammable and is explosive under certain conditions. KEEP OUT OF REACH OF CHILDREN. or equivalent) Use silicone grease. Apply a locking agent. Use a middle strength locking agent unless otherwise specified. Use Fork or Suspension Fluid. Apply sealant. Use DOT 4 brake fluid. Use the recommended brake fluid unless otherwise specified. Replace the part (s) with new one (s) before assembly. Use recommended engine oil, unless otherwise specified. Use molybdenum oil solution (mixture of the engine oil and molybdenum grease in a ratio of 1:1) Use multi-purpose grease (Lithium based multi-purpose grease NLG1#2 or equivalent).
GENERAL INFORMATION SERVICE RULES 1.Use genuine Manufacturer's recommended parts and lubricants or their equivalent. Parts that do not meet Manufacturer's design specifications may cause damage to the motorcycle. 2.Use the special tools designed for this product to avoid damage and incorrect assembly. 3.Use only metric tools when servicing the motorcycle. Metric bolts, nuts and screws. 4.Install new gaskets, O-ring ,cotter pins ,and lock plates when reassembling. 5.When tightening bolts or nuts, begin with the larger diameter or inner bolt first. Then tighten to the specified torque diagonally in incremental steps unless a particular sequence is specified. 6.Clean parts in cleaning solvent upon disassembly. Lubricate any sliding surfaces before reassembly. 7.After reassembly, check all parts for proper installation and operation. 8.Route all electrical wires as shown on pages 1-14 through 1-16, Cable and Harness Routing. GENERAL 26 。 Trochoid Foam Style Oiled polyurethane foam FRAME 21kg (46.3lbs) Assembled type Forced pressure and wet sump Cylinder arrangement 125cc 52.4mmx57mm 90cc= 86ml 110cc=107ml 125cc=122.7ml 90cc 9.0 1 110cc 9.7.1 125cc 9.0.1 Chain driven OHC with rocker arm 7.5 。 BTDC 12.5 。 ABDC 22.5 。 BBDC 2.5 。 BTDC Oil pump type Air filtration Crankshaft type Intake valve opens at 1mm closes (0.04in) closes Lubrication system 3.0&(0.79 US gal, 0.66 lmp gal 0.9&(0.24 US gal, 0.20 lmp gal) Bore and stroke 90cc 47mmx49.5mm 110cc 52.4mmx49.5mm Front/Rear: C-183A-3 Internal expanding shoe Internal expanding shoe 35mm(1.4 in) Swingarm Conventional type oil damper 2.50-10/12/14 2.50/2.75/3.00-10/12 Caster angle Trail length Fuel tank capacity Fuel tank reserve capacity Rear suspension Rear damper Front tyre size Rear Tyre Frame type Back bone Front suspension Telescopic fork Overall Length Overall width Overall height Wheelbase Seat height Foot peg height Ground clearance Dry weight 700mm27.6 in) ENGINE Exhaust valve opens lift Displacement Compression ratio Valve train Engine dry weight SPECIFICATIONS ITEM 1,430mm(71.0 in) 760mm(30.0 in) 950mm(37.4 in) 990mm(38.9in) 215mm(8.5 in) 240mm(9.4 in) 60 kg (180.8 lbs) MODEL IDENTIFICATION (2)The engine serial number is stamped on the lower left of the crankcase. ENGINE SERIAL NUMBER (3)The vehicle identification number (VIN) is located on the right side of the steering head. VEHICLE IDENTIFICATION
Clutch system 4-speed Ignition system Starting system SERVICE LIMIT At draining 0.6(0.6US qt, 0.5lmp qt) ------------------- At disassembly 0.8(0.8US qt, 0.7lmp qt) ------------------- GN4 4-stroke oil or equivalent Motor oil ------------------- APL service classification SF or SG Viscosity: SAE 10W-30 Tip clearance 0.15(0.006) 0.12(0.005) Body clearance 0.02-0.07(0.001-0.003) 0.12(0.005) Side clearance 0.10-0.15(0.004-0.006) 0.20(0.008) FUEL SYSTEM ITEM Carburetor identification number Main jet Jet needle clip positioning Air screw initial opening Float level Idle speed Throttle grip free play Unit:mm(in) ITEM SERVICE LIMIT Cylinder compression 981-1, 177kpa (10.0-12.0kgf/cm 2 , 142-171jpsi)at 1,000 rpm Cylinder head warpage 0.05(0.002) Valve clearance IN 0.05±0.02(0.002±0.001) -------------------- Valve, Valve guide EX 0.05±0.02(0.002±0.001) -------------------- Valve stemO.D. IN 4.970-4.985(0.1957-0.1963) 4.92(0.194) EX 4.955-4.970(0.1951-0.1957) 4.92(0.194) Valve guide I.D IN/EX 5.000-5.012(0.1969-0.1973) 5.03(0.198) IN 0.015-0.042(0.0006-0.0017) 0.08(0.003) EX 0.030-0.057(0.0012-0.0022) 0.10(0.004) Valve seat width IN/EX 1.0-1.3(0.04-0.05) 2.0(0.08) Valve spring free length IN/EX 33.34(1.313) 31.8(1.25) Rocker armRocker arm I.D. IN/EX 10.000-10.015(0.3937-0.3943) 10.10(0.398) Rocker arm shaftO.D. IN/EX 9.978-9.987(0.3928-0.3932) 9.91(0.390) IN 20.003-20.123(0.7875-0.7922) 19.66(0.774) EX 19.994-20.114(0.7872-0.7919) 19.65(0.774) Unit:mm(in) SERVICE ITEM Cylinder I.D. THUMPSTAR 47.05(1.8524) THUMPSTAR 52.45(2.650) Out of round 0.10(0.004) Taper 0.10(0.004) Warpage 0.05(0.002) Piston mark direction "IN"mark facing toward the intake side ----------------- Piston, Piston O.D. 38.975-38.995(1.5344-1.5352) 38.90(1.531) Piston O.D.measurement point 8mm(0.3in)from bottom of skirt ----------------- Piston pin bore I.D. 13.002-13.008(0.5119-0.5121) 13.06(0.514) Piston pin O.D. 12.994-13.000(0.5116-0.5118) 12.98(0.511) Piston-to-piston pin clearance 0.002-0.014(0.0001-0.0006) 0.08(0.003) Piston ring-to-ring 0.015-0.050(0.0006-0.0020) 0.12(0.005) Groove clearance Top Second Piston ring end gap Top 0.05-0.015(0.002-0.006) 0.5(0.02) Second 0.05-0.20(0.002-0.008) 0.5(0.02) Oil(side rail) 0.3-0.9(0.01-0.04) 1.1(0.04) Cylinder-to-piston clearance 0.010-0.040(0.0004-0.0016) 0.15(0.006) Connecting rod small end I.D. 132.016-13.034(0.5124-0.5131) 13.08(0.515) Connecting rod-to-piston pin clearance 0.016-0.040(0.0006-0.0016) 0.12(0.005) Piston rings ------------------- STANDARD ------------------- ------------------- ------------------- STANDARD LUBRICATION SYSTEM 19mm(0.75in) 1,500±100rpm 2.0-6.0mm(1/16-1/4in) ITEM Oil pump rotor STANDARD 1-1/2turns out SPECIFICATIONS VM22-38 VM16-486B 125cc= 95# #95=110cc #85=90cc 4th groove from top (Different in each country) LUBRICATION SYSTEM Engine oil capacity Recommended engine oil CARBURETOR DRIVE TRAIN ELECTRICAL Primary reduction Final reduction CDI (Capacitive Discharge lgnition) Kickstarter and electric Final reduction Multi-plate, wet Automatic centrifugal 4.059(69/17) 2.866(37/14) 1.706(36/11) Clutch operation system Transmission SPECIFICATIONS Carburetor type Throttle bore Piston valve ITEM Stem to guide clearance Cam lobe height GENERAL INFORMATION CYLINDER HEAD/VALVES ITEM Camshaft
Unit:mm(in) ITEM SERVICE LIMIT Clutch disc thickness 2.52-2.68(0.099-0.106) 2.3(0.09) 3.32-3.48(0.131-0.137) 3.0(0.12) Clutch plate warpage 0.20(0.008) Centrifugal clutch spring free length 22.4(0.88) 19.4(0.76) Primary drive gear I.D. 21.000-21.021(0.8268-0.8276) 21.05(0.829) Clutch centre guide 16.988-17.006(0.6688-0.6695) 17.04(0.671) 20.930-20.950(0.8240-0.8248) 20.90(0.823) Crankshaft O.D. at clutch centre guide 16.966-16.984(0.6680-0.6687) 16.90(0.665) Unit:mm(in) ITEM SERVICE LIMIT Cam chain tensioner 11.94(0.470) 100(3.9) CRANKSHAFT/TRANSMISSION/KICKSTARTER ITEM SERVICE LIMIT Crankshaft Side clearance 0.60(0.024) Radial clearance 0.05(0.002) Run out 0.10(0.004) Gear I.D. M2 17.10(0.673) C1 23.10(0.909) C3 20.10(0.791) Transmission Bushing O.D. C1 22.93(0.903) Bushing I.D. C1 20.08(0.791) Gear-to-bushing clearance C1 0.10(0.004) Mainshaft O.D. M2 16.95(0.667) Countershaft O.D. C1 19.94(0.785) Gear-to-shaft clearance M2 0.10(0.004) Gear bushing-to-shaft clear C1 0.10(0.004) Shift fork I.D 34.14(1.344) Claw thickness 4.60(0.181) Shift drum O.D. 33.93(1.336) Unit:mm(in) FRONT WHEEL/BRAKE/SUSPENSION/STEERING ITEM SERVICE LIMIT Minimum tyre tread depth 3.0(0.12) 175kpa(1.75kgf/cm 2, 26.25psi) Axle run out 0.20(0.008) Wheel rim ru 2.0(0.08) Brake 2.0(0.08) Fork 373.5(14.70) Unit:mm(in) ITEM SERVICE LIMIT Minimum tyre tread depth 3.0(0.12) Cold tyre pressure 175kpa(1.75kgf/cm 2 ,29.25psi) -------------------- Axle run out 0.20(0.008) -------------------- Wheel rim run out Radial 2.0(0.08) Drive chain Axial 2.0(0.08) Brake Size/Link DlD420MBK1/88 -------------------- Slack 15-25(9/16-1) -------------------- Brake pedal free play 10-20(3/8-13/16) -------------------- ITEM Spark plug Standard CR6HSA(NGK) U20FSR-U(DENSO) For cold climate/below41oF/50C CR5HSA(NGK) U16FSR-U(DENSO) For extended high speed riding CR7HSA(NGK) U22FSR-U(DENSO) Spark plug gap Ignition coil peak voltage Ignition coil generator peak voltage Alternator exciter coil peak voltage Ignition timing ("F" mark) 0.7Vminimum 100Vminimum 15 . BTDC at idle -------------- SPECIFICATIONS 0.60-0.70mm(0.024-0.028in) 100Vminimum STANDARD -------------- -------------- -------------- 376(14.8) Radial Axial Brake lever free play Spring free length -------------- -------------- STANDARD 10-20(3/8-13/16) -------------- 4.86-4.94(0.191-0.194) 33.950-33.975(1.3366-1.3376) 19.959-19.980(0.7858-0.7866) 0.032-0.077(0.0013-0.0030) 0.020-0.062(0.008-0.0024) 34.075-34.100(1.3415-1.3425) 0.020-0.074(0.0008-0.0029) 16.966-16.984(0.6680-0.6687) 17.016-17.043(0.6699-0.6710) 0-0.012(0-0.0005) 23.020-23.053(0.9063-0.9076) 20.020-20.053(0.7882-0.7895) 22.979-23.000(0.9047-0.9055) 20.000-20.021(0.7874-0.7882) ---------------------- 0.010-0.350(0.0004-0.0138) 111.3(4.38) STANDARD STANDARD 11.985-12.000(0.4718-0.4724) B I.D. O.D. STANDARD Spring free length Push rod O.D. ALTERNATOR/CAM CHAIN TENSIONER A CLUTCH/GEARSHIFT LINKAGE Cold tyre pressure REAR WHEEL/BRAKE/SUSPENSION
STANDARD TORQUE TORQUE N.m(kgf:m,ibf.ft) 4(0.4,2.9) 5mm hex bolt and nut 5(0.5,3.6) 9(0.9,6.5) 6mm hex bolt and nut 10(1.0,7) 10(1.0,7) 8mm hex bolt and nut 22(2.2,16) 12(1.2,9) 10mm hex bolt and nu 34(3.5,25) 12(1.2,9) 12mm hex bolt and nu 54(5.5,40) 26(2.7,20 39(4.1,29) Torque specifications listed below are for important fasteners. Others should be tightened to standard torque values listed above. NOTES:1.Apply oil to the threads. 2.Apply grease to the seating surface. 3.U-nut. 4.ALOC bolt; replace with a new one. ENGINE ITEM TORQUE N.m(kgf.m,lbf.ft) MAINTENANCE: Spark plug 1 10 12(1.2,9) Oil drain bolt 1 12 25(2.5,18) Valve adjuster hole cap 2 30 12(1.2,9) NOTE1 Valve adjuster lock nut 2 5 9(0.9,6.5) Clutch adjuster lock nut 1 8 12(1.2,9) LUBRICATION SYSTEM: Oil pump mounting screw 3 6 8(0.8,5.8) Oil pump cover screw 3 5 5(0.5,3.6) ENGINE REMOVAL/INSTALLATION; Drive sprocket fixing plate bolt 2 6 12(1.2,9) CYLINDER HEAD/VALVES; Cylinder head nut 4 6 11(1.1,8) Cylinder head right side cover bolt 2 6 10(1.0,7) Cam sprocket bolt 2 5 9(0.9,6.5) CYLINDER/PISTON: Cam chain guide roller pin bolt 1 8 10(1.0,7) CLUTCH/GEARSHIFT LINKAGE: Clutch outer cover screw 4 5 5(0.5,3.6) Clutch lock nut 1 14 42(4.3,31) Clutch assembly screw 4 5 6(0.6,4.3) Shift drum stopper arm bolt 1 6 13(1.3,9) Shift return spring pin 1 8 29(3.0,22) Gearshift cam bolt 1 6 17(1.7,12) ALTERNATOR/CAM CHAIN TENSIONER Flywheel nut 1 10 41(4.2,30) Cam chain tensioner sealing bolt 1 14 23(2.3,17) Cam chain tensioner pivot bolt 1 8 16(1.6,12) CRANKSHAFT/TRANSMISSION/KICKSTARTER Shift drum bolt 1 6 12(1.2,9) REMARKS Q'TY THREAD DIAMETER (mm) TORQUE VALUES FASTENER TYPE N.m(kgf:m,ibf.ft)
Thumpstar Thump Off Road Pit Bike 90cc 110cc 125cc Service Repair Shop Manual is a comprehensive guide designed for both professional mechanics and DIY enthusiasts. It provides detailed instructions, wiring diagrams, and pictures to facilitate easy repair jobs. The manual covers all servicing and repair tasks, including routine maintenance.
The manual is available in English and is compatible with Win/MAC/Linux systems. It can be instantly accessed without any shipping costs, making it convenient for immediate use on PC, Tablet, or Laptop. The layout format simplifies the understanding of repair procedures, enabling users to perform their own servicing, maintenance, and repairs.
All models for the specified years and engine types are included in the manual.
It encompasses comprehensive information on service, repair, and maintenance.
Upon payment via Credit/Debit/Paypal Account, the manual is instantly delivered, eliminating the need for shipping. By utilizing the knowledge and information provided in this manual, users can save significant amounts of money by avoiding overpriced professional services for tasks they can easily handle themselves. The manual is user-friendly and can be accessed on any PC/MAC computer.
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Thumpstar Thump Off Road Pit Bike 90cc 110cc 125cc Service Repair Shop Manual