1989-1999 Yamaha TRX850H Service Manual (P/N 4XG-AE1 first edition)
Yamaha Models Covered & Key Technical Specifications
Models: TRX850H
Model Years: 1996 (First Edition)
Serial Numbers: 4XG-AE1
Technical Data:
- Engine: Liquid-cooled 4-stroke, DOHC, 5-valve, forward-inclined parallel 2-cylinder
- Displacement: 0.849 L
- Transmission: Constant mesh 5-speed, spur gear primary, chain drive secondary
- Compression ratio: 10.5:1
- Ignition system: T.C.I. (digital)
- Fuel system: Mikuni BDST38/2 carburetor
- Coolant capacity: 1.7 L
- Curb weight: 209 kg
Yamaha Manual Features & Content Preview
This official OEM publication (P/N 4XG-AE1, first edition released in February 1996) serves as the primary technical reference for the 1996 Yamaha TRX850H. Documenting specific maintenance parameters for the 4XG-AE1 model variant, it details the 850cc parallel-twin engine architecture and diamond-frame chassis configuration.
- Contains 47 high-detail exploded-view diagrams mapping out component assemblies.
- Provides 35 comprehensive tables detailing precise torque values for exact shop-floor rebuilds.
Manual Organization and Chapter Breakdown
Factory literature structures technical data for logical diagnostic flow. Initial chapters establish the motorcycle's core identity, including frame and engine serial number locations, alongside essential preparation protocols. From there, the documentation moves into periodic maintenance routines, lubrication intervals, and systematic inspection methods for the cooling, braking, and electrical networks. Because working on high-performance motorcycles carries inherent risks to both machine and mechanic, reviewing these factory-established preparatory steps and safety precautions before tearing down components is highly recommended. The latter portion of the text delivers deep-dive specifications covering internal clearances, suspension base settings, and precise cable routing configurations.
Engine and Chassis Specification Highlights
Mechanical accuracy relies on exact tolerances. For example, the engine specification table documents the intake valve internal clearance at 0.15 to 0.20 mm. Assembly data dictates a 40 Nm torque value for the primary flange bolts during crankcase mating. Additionally, the manual states a total coolant capacity of 1.7 liters for the radiator and surrounding system. By providing detailed carburation baselines, electrical schematics, and chassis torque values, this guide offers technicians the verifiable data needed for absolute mechanical oversight of the parallel-twin power plant.
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