1986-1987 Honda Fourtrax TRX70 Service Manual

Honda TRX70 Fourtrax (1986–1987) Official Factory Service Manual

• Covers all 1986–1987 Honda TRX70 Fourtrax ATV models
• Official Honda publication (Part No. 61204-958-000), first edition, 158 pages
• Instant, fully searchable PDF download—accessible right after checkout
• Print-ready for standard US Letter and A4 formats
• Includes 17 comprehensive sections covering engine removal, fuel systems, cylinder heads, valves, and transmission specs
• Delivers exact factory-authorized parameters for engine rebuilds and chassis maintenance

Component and System Documentation

This factory publication delivers the exact mechanical parameters used by dealership technicians. It breaks down the TRX70 across 17 sections, highlighting critical areas like engine lubrication, fuel system teardowns, and the valve train. You will find complete assembly sequences for the 4-speed semi-automatic transmission and the overhead camshaft chain-driven engine configuration. The documentation focuses entirely on providing the necessary data for professional overhauls, avoiding unnecessary filler.

Specification Highlights

The manual documents all crucial factory specifications required for a full rebuild or routine maintenance. Key data points include the 72cc displacement (3.75 BHP at 7,000 rpm), standard cylinder compression (1,200 ± 150 kPa), and 0.05 mm valve clearances for both intake and exhaust. It also outlines the 10–20 mm drive chain slack and specific pilot screw turn-out settings for the PB86A carburetor across the different model years.

Working on ATV drivetrains and fuel systems involves inherent mechanical and safety risks; having these exact factory torque settings and adjustment parameters is essential for ensuring safe, reliable operation. This 158-page original factory workshop manual provides the precise technical depth needed to get the job done right.