Yamaha Big Wheel 350 / BW350T Service Manual 1987-1988
Wiring diagrams, specifications, and repair sequences for the 1987-1988 Yamaha Big Wheel 350 and BW350T. Documents engine overhaul, carburetion, and chassis procedures. PN LIT-11616-05-69
Yamaha Models Covered & Key Technical Specifications
Models: Yamaha Big Wheel 350
Sub-models / Variants: BW350T
Model Years: 1987–1988
Serial Numbers: BW350T JYA2JN00*HC000101 and up (Vehicle), BW350T 2JN-000101 and up (Engine)
Technical Data:
- Engine Displacement: 350 cc
- Engine Idle Speed: 1,500 r/min
- Compression Pressure (Standard): 850 kPa (120 psi)
- Spark Plug Gap: 0.6–0.7 mm (0.024–0.028 in)
- Valve Clearance (Cold): Intake 0.06–0.10 mm, Exhaust 0.16–0.20 mm
- Engine Oil Capacity (Without Filter Change): 1.3 L
- Engine Oil Capacity (With Filter Change): 1.4 L
- Tire Pressure (Cold): 40 kPa (5.8 psi)
- Front Fork Oil Capacity: 241 cm³ per fork
Yamaha Manual Features & Content Preview
Official Service Documentation for the 1987–1988 Yamaha Big Wheel 350
- Covers 1987–1988 Yamaha Big Wheel 350 (BW350T) models, detailing engine, chassis, fuel delivery, and electrical system diagnostics
- Official OEM 100-page publication (LIT-11616-05-69), first edition November 1986
- Features technical specification tables, exploded-view assembly diagrams, and precise torque values for the 350 cc power unit
- Complete digital manual available as an instant download directly upon checkout
- Searchable OCR text layer accelerates your repair prep by letting you jump instantly to specific torque specs or part data
- Formatted for standard US Letter and A4 printing
Technical Specifications and Maintenance Data
The 1987–1988 Yamaha Big Wheel 350 service manual documents the exact factory specifications required for routine maintenance and complete engine overhauls of the BW350T model. Working on vintage ATVs carries inherent physical risks. Always follow basic workshop safety protocols and secure the vehicle properly before inspecting mechanical components. This 1986 first edition serves as the foundational reference for the production cycle. It details the unique 350 cc air-cooled powerplant and chassis geometry. Major sections break down complex systems into clear data sets. You will find specific overhaul parameters, transmission shifting mechanics, and primary drive system layouts. The manual also outlines front fork maintenance requirements, ensuring correct component reassembly through explicit torque data and lubrication points.
Essential Workshop Reference Values
Having accurate data on hand eliminates guesswork during an active repair project. This official publication provides the exact tolerances needed for the BW350T. For example, the cylinder head specification table lists the intake valve clearance at 0.06–0.10 mm. Standard compression pressure at sea level is 850 kPa. Additionally, the manual dictates a clutch adjustment free play of 2–3 mm to guarantee correct lever actuation. By relying on these factory-verified numbers, technicians and DIY mechanics can maintain the integrity of their vintage Yamaha machines.
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