1979-1992 Yamaha QT50J, MA50 Yamahopper Service Manual

Complete service and repair data for 1979-1992 Yamaha QT50J and MA50 Yamahopper models. Features detailed procedures, diagrams, and specifications. Publication LIT-11626-02-97.

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Document Details

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Document Number / Seller:
25059 / Daniel King
File Size:
79.53 MB
File Type:
ZIP
Language:
English
Printable:
Yes
Category:
Moped
Last updated / verified
Jun 20, 2025

Models Covered & Key Technical Specifications

Systematic Calibration Safety Manual: Moped 1979-1992 Yamaha QT50J, MA50 Yamahopper owners, service manual Data-Compendium

Covers QT50J, MA50 Yamahopper models with detailed procedures for maintenance, repair, and troubleshooting. Includes comprehensive diagrams and specifications. | Series Yamaha Toolkit.

  • Calibrated Torque Data: 10 Nm is established at the cylinder head nut torque Specification.
  • System Moment Values: For optimal operation, 20 Nm yields the oil pump minimum torque Value.
  • Published Charge Quantity: 43 kg -- signifies the total vehicle weight Threshold.
  • Authorized Voltage Specs: The battery capacity requires 6V for standard operation Logic.
  • Core Output Performance: Maximum throughput reaches 30 Nm Parameters.
  • Standard Maximum Resolution: The formatter board requires 2.3 L for standard operation Logic.

Professional Workshop Service Manual & Technical Specifications

Systematic Calibration Safety Manual: Moped 1979-1992 Yamaha QT50J, MA50 Yamahopper owners, service manual Data-Compendium

Maintenance-Category: QT50J, MA50 Yamahopper // Conceptual-Layout: moped / internal combustion Logic // Maintenance-Category: technical-details.

Performance-Element Operational-Logic Calibration-Standards
Engine Overhaul Proper Assembly Maximum Specifications
Electrical System Diagnostic Procedures Component Testing
Chassis Inspection Guidelines Alignment Data
Carburetion Adjustment Steps Fuel System Calibration
Troubleshooting Fault Identification Repair Procedures

The manual presents information on the QT50J and MA50 Yamahopper models, covering a wide range of maintenance and repair procedures. It details the proper disassembly, inspection, and reassembly of various systems, including the engine, chassis, electrical components, and carburetion. Diagnostic procedures are also included to help identify and resolve common issues.

Inspection guidelines are provided for general maintenance, including checks for brakes, tires, lights, and fluid levels. The manual details periodic maintenance schedules, outlining necessary services at specific mileage intervals. This ensures the vehicle remains in optimal operating condition.

Alignment specifications are included for critical components like the steering head and suspension. Proper alignment is crucial for safe handling and performance. The manual provides clear instructions and diagrams to guide these adjustments.

Reference data is included for all major systems, providing essential specifications for various components. This includes details on engine specifications, electrical system parameters, and chassis dimensions. These specifications are vital for accurate diagnosis and repair.

This manual covers the complete breakdown and reassembly of the engine, including the cylinder head, piston, crankshaft, and transmission. Detailed illustrations accompany each step, ensuring clarity during complex engine work.

Diagnostic procedures are covered for electrical and mechanical systems. The manual guides the user through systematic troubleshooting steps to pinpoint the root cause of a problem, referencing specific tests and measurements.

FAQ

What are the **proper** clearance measurements? keyboard_arrow_down

0.035 ~ 0.047 mm (0.0014 ~ 0.0019 in) is the standard piston clearance for the QT50J model.

Specify the **standard** torque specifications. keyboard_arrow_down

20 Nm (14 ft-lb) is the specified torque for the spark plug on the QT50J.

What is the **necessary** safety precautions? keyboard_arrow_down

Refer to page 89 for critical safety measures regarding engine break-in procedures, specifically the CAUTION to consult a Yamaha dealer if any engine trouble occurs during the initial 1,000 km (600 mi) period.

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Reviews (4)

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This manual is incredibly detailed and easy to follow. Perfect for anyone working on their Yamaha QT50!
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I had a smooth experience downloading the manual. The support team was very helpful and responded quickly to my queries. Highly recommend!
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The diagrams and troubleshooting tips are a lifesaver. Download process was seamless and support was exceptional!
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Rated 5 out of 5 stars