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Baotian 139QMA User Manual

Baotian 139QMA
41 pages
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Baotian 139QMA Specifications

General IconGeneral
BrandBaotian
Model139QMA
CategoryEngine
LanguageEnglish

Summary

Foreword

Chapter One General Information

Engine Number Location

Specifies the location of the engine serial number on the crankcase.

Basic Technical Specifications

Details key engine specifications including starting mode, cylinder count, bore, stroke, displacement, and compression ratio.

Precautions in Disassembling and Assembling

Tightening Torque Value

Standard Torque Value

Provides standard torque specifications (N.m) for common bolt and nut sizes used in assembly.

Torque Values of Important Engine Parts

Lists specific torque values for critical engine components like cylinder head bolts, oil drain bolts, and others.

Tools

Specialized Maintenance Tools

Illustrates and lists specialized tools required for specific maintenance procedures.

Common Workshop Tools

Illustrates and lists common workshop tools such as wrenches, screwdrivers, and pliers.

Engine Oil Supply Locations

Trouble Finding

Difficult Starting or Refusal to Starting

Diagnoses causes and provides troubleshooting methods for engine starting failures.

Difficult Rotation (Poor Acceleration or Feeble Rotation)

Addresses issues related to poor engine acceleration and sluggish performance.

Difficult Rotation (High Speed)

Troubleshoots engine performance problems that occur at high speeds.

Improper Charging of Battery

Identifies causes and solutions for battery overcharging or over-discharging issues.

Spark Plug Does Not Spark

Diagnoses ignition system faults leading to no or weak spark from the spark plug.

Difficult Rotation (Low Speed and Idle Speed)

Troubleshoots engine issues affecting operation at low speeds and idle.

Maintenance Intervals

Engine Disassembling, Assembling, Inspecting and Adjusting

Air Inlet Housing and Airfoil Disassembling, Assembling and Inspecting and Adjusting

Details procedures for servicing the air intake and airfoil components.

Disassembling, Assembling and Inspecting Cylinder Head Hood

Steps for removing, inspecting, and reinstalling the cylinder head hood.

Cylinder Head and Valve

Details on disassembling, inspecting, and adjusting cylinder head and valves.

Disassembling and Inspecting Cylinder Block and Piston

Procedure for dismantling and inspecting the cylinder block and piston assembly.

Kickstarter Disassembling and Inspecting

Instructions for dismantling and inspecting the kickstarter mechanism.

Disassembling and Inspecting Stepless Transmission System

Procedure for servicing the continuously variable transmission (CVT).

Electric Starter

Information on the electric starter system, including its components and troubleshooting.

Magneto and Electric Parts

Composition of Magneto and Electric Parts

Overview of the magneto, CDI, ignition coil, and rectifier adjustor.

Magneto and Electric Parts Disassembling and Assembling

Procedure for servicing the magneto and related electrical components.

Ignition System

Details on the ignition system, circuit diagram, and maintenance precautions.

Maintenance Data

Specific maintenance data for the ignition system, including spark plug and coil resistance values.

Charge (Lighting) System

Information on the charging and lighting system, including circuit diagrams and troubleshooting.

Crankcase and Crankshaft

Crankcase and Crankshaft Disassembling and Inspecting

Procedure for dismantling and inspecting the crankcase and crankshaft assembly.

Timing Chain and Tensioner

Timing Chain and Tensioner Disassembling and Inspecting

Procedure for servicing the timing chain and tensioner assembly.

Lubrication System

Lubrication System

Diagram and description of the engine lubrication system components.

Precautions

Safety and procedural precautions for maintaining the lubrication system.

Trouble Finding

Diagnoses and solves common issues related to the engine lubrication system.

Use and Inspection

Guidelines for checking and maintaining engine oil levels and performing oil changes.

Rear Transmission

Rear Transmission Disassembling and Inspecting

Procedure for dismantling and inspecting the rear transmission system components.

Carburetor

Precautions in Carburetor Maintenance and Adjustment

Safety guidelines and precautions for servicing and adjusting the carburetor.

Basic Structure of Carburetor

Overview of the carburetor's main components, control system, and fuel supply systems.

Carburetor Disassembling, Cleaning and Inspecting

Step-by-step guide for dismantling, cleaning, and inspecting the carburetor.

Starting Primer Valve Disassembling and Inspecting

Procedure for servicing the starting primer valve and its associated components.

Carburetor Idle Speed Adjustment

Instructions for adjusting engine idle speed for optimal performance and stability.

Carburetor Troubleshooting and Maintenance

Diagnoses and resolves common carburetor issues and performance problems.

Air Filter

Attached Pages: Special Tools

Special Tool Illustrations

Visual guide to specialized tools required for motorcycle maintenance.

Universal Tool Illustrations

Visual guide to common tools used for general motorcycle maintenance tasks.

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