1984-1989 Honda ATC90/ATC110 Shop Manual

Complete service reference for Honda's iconic three-wheel ATC models. Covers engine, frame, wheels, drive chain, and all repair procedures with factory torque specs.

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Honda Models Covered & Key Technical Specifications

Models: Honda ATC90, Honda ATC110, US90
Sub-models / Variants: ATC90K2, ATC90K3
Build Years: 1973–1981, 1984–1989
Serial Numbers: ATC90E-1600001 and subsequent, ATC90-1600001 and subsequent
Technical Data:

  • Engine displacement: 89 cc (5.48 cu in) or 89.5 cc
  • Engine oil capacity: 1.0 US qt (0.91 L)
  • Fuel tank capacity: 1.7 US gal (6.5 L)
  • Compression ratio: 8.2:1
  • Horsepower: 5.0–6.0 PS at 7,500 rpm
  • Spark plug gap: 0.024–0.028 in (0.6–0.7 mm)
  • Cylinder head bolt torque: 14.5–18.1 lbs-ft (1.5–2.0 kg-m)
  • Rotor torque: 18.8–23.1 lbs-ft (2.6–3.2 kg-m)
  • Wheel hub bolt torque: 14.5–17.4 lbs-ft (2–2.4 kg-m)
  • Valve tappet clearance: 0.002 in (0.05 mm)
Technical Specifications
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Document Number / Seller:
24462 / Kenneth Johnson
File Size:
12.45 MB
File Type:
PDF
Language:
English
Pages:
127
Printable:
Yes
Category:
Three-Wheeler
Last updated / verified
Oct 10, 2025

Honda Manual Features & Content Preview

Technical Scope and Service Data for the Honda ATC90 and ATC110

  • Covers 1973–1981 and 1984–1989 Honda ATC90 and ATC110 three-wheelers, including US90-based variants and the upgraded K3 series mechanics
  • Official OEM publication containing detailed technical specifications, wiring diagrams, and exploded-view part assembly schematics
  • Documents major technical shifts, including the introduction of the ATC90K3 chain guide, upgraded chain tensioner arm, and split-rim tubeless tire configurations
  • Files are available as a direct download the moment payment clears
  • No shipping wait — the PDF is available immediately after purchase
  • Laid out for standard letter and A4 printing
  • Full-text search finds any part number in seconds
  • This 127-page shop manual provides the exact factory assembly and inspection values needed to calibrate the ATC90, ATC110, and US90 drivetrain components

Component and Engine Maintenance

This factory service publication provides technical summaries for the maintenance of the Honda ATC90 and ATC110 platforms, covering everything from core engine disassembly to final chassis alignment. The text details standard procedures for the cylinder and piston service, the recoil starter assembly, and the primary drive mechanism. Sections are organized to allow quick navigation between engine removal, transmission adjustments, and steering system inspection.

Specification Highlights

The Honda ATC90 and ATC110 shop manual includes comprehensive reference values for every major system, including tightening torque for the cylinder head, wheel hubs, and rotor assembly. The cylinder bore diameter standard is listed at 50.0–50.01 mm, with service limits defined for rebore procedures. Valve clearance is set at 0.002 in (0.05 mm) for cold engine operation, ensuring correct valvetrain what an OEM service publication covers settings. Condenser capacity is documented at 0.225–0.275 μF for electrical testing. An official 127-page Honda OEM shop manual covering the 1973–1989 Honda ATC90, ATC110, and US90, documenting engine, chassis, electrical, and drive-mechanism specifications for the various K-series model builds.

Manual FAQ, Purchase & Download Details

Which service data categories like fluid capacities or lubricant charts appear in the document? keyboard_arrow_down

Manual lists technical specification tables and service data references that cover fluid capacities for the engine crankcase and general lubricant recommendations for various components.

Are the major system chapters for the engine and drive mechanism included in this shop manual? keyboard_arrow_down

Yes, the manual contains dedicated sections for the engine and chassis systems, including detailed chapters on the drive mechanism and wheel assemblies. These chapters provide technical references and exploded view diagrams specific to the ATC90 and ATC110 models.

Is there a section for tightening specifications or wheel hub torque references? keyboard_arrow_down

Document includes specification tables that reference tightening torque values for key components such as the wheel hub assembly fasteners.

What publication cues or edition details are associated with this specific shop manual? keyboard_arrow_down

Shop manual is identified as a Honda publication covering the ATC90 and ATC110 models produced between 1973 and 1981. It serves as a service resource for the personnel responsible for these specific three-wheeler series. The cover references publication number 6291806 and includes a total of 127 pages.

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