1977-1982 Yamaha GT80, GTMXE, GT80G, GT80J, DT80J, DT100D, DT100G, DT100J Service & Supplementary Manual

Yamaha GT80 and DT100 Service Coverage

• Covers 1977–1982 Yamaha GT80, GTMXE, GT80G, GT80J, DT80J, DT100D, DT100G, and DT100J motorcycle variants
• Official Yamaha publication P/N LIT-11616-03-05, consolidating supplementary service data for the 1977–1982 series
• Contains 35 exploded-view component diagrams and 2 complete wiring schematics for both 80cc and 100cc engine configurations
• Delivered as a direct download the moment payment clears
• Stored against your account so you can retrieve it after a hard-drive loss
• Full-text search finds any part number in seconds
• Laid out for standard letter and A4 printing
• This technical volume is the definitive factory reference for the 3J8 and 3A3 chassis and engine builds

Factory Documentation Scope

This collection provides technical documentation for the Yamaha GT80, GTMXE, and DT100 series, bridging multiple supplemental manuals into one reference file. The publication details mechanical precepts and maintenance intervals for the 2-stroke engine, including internal assemblies for the crankshaft, transmission, and clutch. Separate chapters address carburetion tuning, chassis alignment, and detailed electrical system pathing, providing the data necessary for professional-grade maintenance work.

Technical Data Preview

The manual details specifications for the 72cc GT80 and 97cc DT100 powerplants, including precise torque values for cylinder head nuts and primary drive gears. Reference values for ignition timing, spark plug gaps, and oil capacities are provided in organized tables. The 2006 Honda GL 1800 documentation style is mirrored here for consistency, featuring what an OEM service publication covers regarding engine assembly and lubrication circuits. Crankshaft assembly width is 38 mm for GT80 models. Cylinder head warp limits are set at 0.03 mm for the 1977–1982 Yamaha GT80 engine series. Ignition timing for these models is 21° B.T.D.C. at 2,000 r/min. Reference only — always consult a certified technician before performing service on this equipment.

An official 175-page Yamaha OEM workshop manual covering the 1977–1982 GT80 and DT100 series, documenting engine, chassis, electrical, and fuel-injection specifications for the 3J8 and 3A3 build.