1985 Honda Big Red ATC250ES Three-Wheeler Service Manual
Complete Honda ATC250ES service procedures including engine removal, transmission repair, and suspension systems. Factory service specifications and torque values for 246cc 4-stroke overhead camshaft engine.
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Sample pages from the 1985 Honda Big Red ATC250ES Three-Wheeler Service Manual manual
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Honda Models Covered & Key Technical Specifications
Models: Honda ATC250ES Big Red
Build Years: 1985–1987
Technical Data:
- Engine displacement: 246 cc
- Engine configuration: Air-cooled 4-stroke, single cylinder inclined 20°
- Bore x stroke: 74.0 mm x 57.3 mm
- Compression ratio: 9:1
- Maximum horsepower: 17.8 BHP @ 7000 rpm
- Maximum torque: 1.9 kg-m @ 6000 rpm
- Transmission: 5-speed constant mesh with reverse
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Technical Scope and Features
- Covers 1985–1987 Honda ATC250ES Big Red three-wheelers, including both '85 and After '85 model year specific configurations.
- Official Honda publication covering service and maintenance for the 246 cc air-cooled 4-stroke engine and transmission system.
- Contains 47 exploded-view diagrams and 18 technical specification tables including torque settings and fluid capacities.
- Files are laid out for standard letter and A4 printing.
- Indexed PDF search covers every chapter and appendix.
- This original OEM manufacturer publication is the definitive service reference for the 1985–1987 Honda ATC250ES Big Red three-wheeler series, documenting drivetrain, chassis, and electrical specifications for the multi-year production cycle.
Component and Systems Documentation
The how factory workshop documentation is structured for the 1985–1987 Honda ATC250ES Big Red is organized into 20 distinct sections covering every primary vehicle system. Initial chapters provide foundational technical data, torque values, and maintenance schedules tailored to 1985 and later manufacturing runs. Subsequent chapters offer detailed technical overviews of the fuel system, top-end engine components, manual clutch, oil pump, and kick starter assemblies. The documentation continues through the chassis, detailing steering, suspension, and braking systems, before concluding with extensive electrical wiring diagrams and troubleshooting flow charts.
Technical Specification Highlights
Engine performance data for the 1985–1987 Honda ATC250ES Big Red includes a compression ratio of 9:1 and a peak output of 17.8 BHP. Cylinder head bolt torque is documented at 22–28 Nm in the engine assembly data. Valve clearance for the intake is listed at 0.08 mm in the maintenance specification table. Engine oil capacity for the 1985–1987 Honda ATC250ES Big Red is specified at 2.5 liters after full disassembly. Reference only — always consult a certified technician before performing service on this equipment.
Document Reference: Original OEM manufacturer publication, '85-'87 ATC250ES Big Red
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