Original Yamaha GT80, GTMXE, GT80G, GT80J, DT80J, DT100D, DT100G & DT100J Service & Supplementary Manual: PDF for Motorcycles (1977-1982)
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Sample pages from the Original Yamaha GT80, GTMXE, GT80G, GT80J, DT80J, DT100D, DT100G & DT100J Service & Supplementary Manual: PDF for Motorcycles (1977-1982) manual
Purchase Information
1977-1982 Yamaha GT80, DT100 service manual - Technical Specifications
- Document Number / Seller:
- 24680 / John Parker
- File Size:
- 21.80 MB
- File Type:
- ZIP
- Language:
- Pages:
- 175
- Printable:
- Yes
- Estimated Download Time:
- 0.45 Minutes
- Delivery Format:
- Digital (PDF) - Instant Access
- Category:
- Bike
- Brand:
- Yamaha
- Reviewed and Approved:
- Dec 24, 2025
Yamaha Models and Parts Covered in this Bike Manual
- GT80E (1977-1982)
- GTMXE (1977-1982)
- GT80G (1980)
- GT80J (1982)
- DT80J (1982)
- DT100D (1977-1982)
- DT100G (1980)
- DT100J (1982)
Complete Manual Information
Original Yamaha GT80, GTMXE & DT80-DT100 Series (1977-1982) Service & Supplementary Manual
Restore, maintain, and master your classic Yamaha with this comprehensive professional-grade service manual. This document is a critical resource for owners and mechanics working on the legendary GT and DT series motorcycles from the late 70s to the early 80s.
This is not just a basic guide; it is a compilation of the original Factory Service Manuals and all necessary Technical Supplements. Whether you are performing a simple oil change or a complete engine rebuild, this manual provides the precise factory specifications required to get the job done right.
Covered Models and Production Years
This manual covers a wide range of Yamaha’s most popular small-displacement dual-purpose and off-road motorcycles:
- GT80E (1977-1982)
- GTMXE (1977-1982)
- GT80G (1980)
- GT80J (1982)
- DT80J (1982)
- DT100D (1977-1982)
- DT100G (1980)
- DT100J (1982)
Vehicle Identification & Serial Numbers
For accurate parts ordering and identification, this manual includes starting serial numbers for various production runs, such as:
- GT80G: Starting 3J8-000101
- DT80J: Starting 3J8-150101
- DT100J: Starting 3A3-070101
Detailed Technical Insights
The Yamaha GT and DT series are famous for their reliable 2-stroke engines and "Torque Induction" systems. This manual covers the technical nuances between the models, including:
- Engine: Air-cooled 2-stroke singles with displacements of 72cc, 73cc, and 97cc.
- Induction: Detailed service for the reed valve systems.
- Transmission: Complete tear-down for 4-speed (80cc) and 5-speed (100cc) gearboxes.
- Ignition: Maintenance for both Flywheel Magneto and advanced C.D.I. (Capacitor Discharge Ignition) systems used in later models like the DT80J.
Comprehensive Table of Contents
General Information
- Detailed Specifications
- Vehicle Identification (Frame & Engine Numbers)
- Essential Tools and Safety Equipment
Periodic Inspections and Adjustments
- Maintenance intervals to keep your vintage Yamaha running smoothly
- Brake system adjustments and cable lubrication
- Drive chain tension and sprocket wear inspection
Engine Overhaul
- Step-by-step engine removal and installation
- Cylinder head, piston, and reed valve inspection
- Crankshaft and transmission service procedures
Carburetion
- Mikuni carburetor disassembly and cleaning
- Float
Download Instructions for Yamaha Bike Manual
Frequently Asked Questions - Yamaha Bike Manual
What does this Yamaha manual cover?
This comprehensive service manual covers detailed repair procedures, maintenance schedules, troubleshooting guides, and technical specifications for Original Yamaha GT80, GTMXE, GT80G, GT80J, DT80J, DT100D, DT100G & DT100J Service & Supplementary Manual: PDF for Motorcycles (1977-1982). It includes information for the following models: - GT80E (1977-1982) - GTMXE (1977-1982) - GT80G (1980) - GT80J (1982) - DT80J (1982) - DT100D (1977-1982) - DT100G (1980) - DT100J (1982).
Is this manual suitable for beginners?
Yes, this Yamaha manual is designed for both professional technicians and DIY enthusiasts. It includes step-by-step procedures with clear illustrations and safety guidelines for Bike maintenance and repair.
What file format will I receive?
You will receive this manual as a ZIP file (21.80 MB), which is compatible with all devices. The manual is fully searchable and printable for your convenience.
How quickly can I access the manual after purchase?
You'll receive instant access to your Yamaha Bike manual immediately after payment completion. The download link is valid for 3 days, with lifetime re-download guarantee.
Can I print specific sections of the manual?
Absolutely! This digital manual allows you to print any section you need, from individual pages to complete chapters, making it perfect for workshop use.
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