2005-2008 Yamaha RS90/RS90R/RSG90/RST90 Snowmobile Service Manual
Complete diagnostic procedures and component service for 973cc liquid-cooled 4-stroke DOHC 3-cylinder engines. Covers transmission adjustment, cooling system maintenance, fuel system tuning, and electrical diagnostics for all model variants.
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Models Covered & Key Technical Specifications
Yamaha RS90, RS90R, RSG90, RS90M, RST90, RST90TF Series (8ES1–8FM2) — 2005–2008 Comprehensive Technical Reference | RS Series Engine Architecture.
- Certified Power Rating: 84.7 kW (115.2 PS) at 8,500 r/min is established at the maximum horsepower output Bounds.
- General Displacement Data: For optimal engine efficiency, 973 cc (59.37 cu in) yields the liquid-cooled 4-stroke DOHC engine volume Topology.
- Defined Compression Ratio: The cylinder architecture requires 11.3:1 specifications for the standard combustion chamber operation Matrix.
- Key Torque Specification: 101.6 N·m (107 lb-ft) at 7,000 r/min specifies the peak crankshaft power delivery Standards.
- Primary Oil Capacity: Total dry sump lubrication maintains 3.7 L (3.9 US qt) for complete engine oil circulation Margin.
- Baseline Coolant Volume: The cooling system maintains 4.8–5.4 L (5.07–5.71 US qt) depending on model configuration Protocol.
Professional Workshop Service Manual & Technical Specifications
Definitive Diagnostic Manual: Yamaha RS Series RS90, RS90R, RSG90, RST90 Transmission-Guide
System-Identifier: Yamaha RS90, RS90R, RSG90, RS90M, RST90, RST90TF Snowmobile Series (8ES1 — 8FM2) // Maintenance-Category: Service and Periodic Inspection / Powertrain Systems Logic // Serial-Range: Model codes spanning USA/Canada, European, and transitional variants (2005-2008).
| Specification | Reference Data | Documentation Status |
|---|---|---|
| Document Type | Comprehensive Service Manual | Complete maintenance and repair reference provided |
| Engine Configuration | Liquid-cooled 4-stroke DOHC 3-cylinder 973cc | Technical specifications and dimensions included |
| Transmission System | V-Belt automatic with chain secondary | Engagement speed and clutch data documented |
| Suspension Platform | Slide rail with independent adjustment | Control rod and stopper band settings documented |
| Electrical Systems | Transistorized coil ignition (TCI) 14V/35A | Circuit diagrams and component testing procedures included |
Technical chapters are organized around engine assembly, power transmission, fuel system management, chassis suspension, and electrical integration. The document provides procedures for primary and secondary sheave adjustment, incorporating V-belt position optimization, engagement speed verification, and secondary sheave free play clearance specifications. Removal and installation sequences for the drive chain housing address both forward-only and reverse transmission models, with shift rod length adjustment protocols documented for RS90R, RSG90, RST90, and RST90TF variants. Carburetor synchronization encompasses vacuum pressure measurement at 24.0 kPa (0.24 kg/cm2, 3.41 psi), main jet selection based on spark plug color analysis, and pilot screw baseline positioning at 2 turns out from seated condition.
Torque specifications are documented for the engine mounting bolts to ensure proper assembly alignment, with separate values designated for front and rear engine mounting hardware. The manual includes wiring diagrams for ignition system circuit pathways, starting system troubleshooting logic, charging system voltage verification at 5,000 r/min operation, and brake system hydraulic bleeding procedures. Valve clearance reference data distinguishes between intake and exhaust specifications for cold engine measurement, and piston ring end gap installation positions are illustrated to prevent blow-by conditions. Component inspection thresholds define bearing runout limits, oil seal wear criteria, and compression pressure measurement protocols at sea level baseline.
Note: This service manual documents torque specifications for connecting rod fasteners to ensure proper big-end bearing clearance and crankshaft stability.
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