1985-1987 Honda ATC 250SX Service Manual

Factory service guide for 246cc 4-stroke three-wheeler—carburetor adjustment, torque specs, and component replacement procedures. Complete engine, transmission, final drive, and electrical system coverage.

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Technical Safety Notice
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This official OEM document is intended for professional technicians and skilled operators. Performing service on mechanical equipment involves inherent risks. By purchasing, you acknowledge that RepairLoader provides original manufacturer data for informational purposes. Always prioritize safety: use correct tools, wear protective gear, and consult a certified professional if you are uncertain of any procedure.

Honda Models Covered & Key Technical Specifications

Models: Honda ATC 250SX
Build Years: 1985–1987
Technical Data:

  • Engine displacement: 246 cc (15.0 cu in)
  • Engine configuration: Single cylinder, 4-stroke, air-cooled, 20-degree incline
  • Compression ratio: 9:1
  • Transmission type: 5-speed constant mesh with reverse
  • Clutch: Wet multi-plate, semi-automatic
  • Final drive ratio: 4.969 (13/19-10/34)
  • Fuel tank capacity: 9.8 liters (2.6 US gal)
Technical Specifications
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Document Number / Seller:
24461 / George Henry
File Size:
35.04 MB
File Type:
PDF
Language:
English
Pages:
261
Printable:
Yes
Category:
Three-Wheeler
Last updated / verified
Mar 23, 2025

Honda Manual Features & Content Preview

1985–1987 Honda ATC 250SX Maintenance and Service Data

  • Covers 1985–1987 Honda ATC 250SX three-wheelers, including 1985 and 1986 early-run models and post-1986 variants
  • Original OEM publication, referenced for technical specifications and system maintenance
  • Contains 47 detailed exploded-view diagrams and 6 torque-value specification tables covering engine and chassis fasteners
  • Delivered as a direct download the moment payment clears
  • Full-text search finds any part number in seconds
  • This reference document details the factory-specified maintenance intervals, engine component specifications, and assembly sequences unique to the 250SX series build

Technical Scope and Specifications

This 261-page factory service publication documents the complete mechanical architecture for the 1985–1987 Honda ATC 250SX. The manual details general maintenance procedures, engine removal and installation, and chassis servicing, with dedicated chapters for the fuel system, ignition components, and transmission drive train. Information provided includes standardized torque values, cable routing diagrams, and service limits for critical wear items like cylinder bore, piston-to-cylinder clearance, and valve stem-to-guide tolerances.

Engine and Component Data Preview

The 1985–1987 Honda ATC 250SX engine displacement is documented at 246 cc with a 9:1 compression ratio. Cylinder head assembly specifications list a 35–40 N·m (25–32 ft-lb) torque value for cap nuts. Camshaft journal bearing inner diameter for the left side is listed at 20.05 mm in the service limit table. The 1985–1987 Honda ATC 250SX fuel system requires specific jetting for high-altitude operation, with #130 main jets specified for lower altitudes and #125 for altitudes above 5,000 feet. For more information, visit what an OEM service publication covers to understand how these factory specifications are structured for professional maintenance. This professional manual is the primary reference for servicing the 1985–1987 Honda ATC 250SX, documenting engine, chassis, and electrical parameters for the 250SX-series three-wheeler.

Manual FAQ, Purchase & Download Details

Is the 1985-1987 Honda ATC 250SX service manual available in PDF format? keyboard_arrow_down

Document is provided as a digital PDF file, containing 261 pages of comprehensive technical data specifically for the 1985-1987 Honda ATC 250SX series.

Does the manual include information covering both the 1985 and 1986 through 1987 model year variations? keyboard_arrow_down

Manual provides comprehensive coverage for the 1985-1987 Honda ATC 250SX, specifically referencing model year differences for maintenance intervals, electrical components, and frame specifications throughout the chapters.

Are there exploded view diagrams provided for the clutch and oil pump systems in this manual? keyboard_arrow_down

Section 8 contains detailed assembly illustrations, exploded views, and component groupings for the clutch, oil pump, and kick starter systems to assist in visualizing the internal configuration.

Does the manual contain technical specification tables for engine bore and stroke or valve clearance values? keyboard_arrow_down

Chapter 1 provides general information specification tables that include bore and stroke data, valve clearance references, and torque values for engine-related components.

Can I find connector pinout references and wiring diagrams within the electrical system sections? keyboard_arrow_down

Section 18 is dedicated to the wiring diagram, while other electrical system chapters include references to cable and harness routing, along with connector locations for the charging and ignition systems.

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