Unison Desert Cat 50 & 90cc Service Manual
Desert Cat service documentation covering Mikuni carburetors, C.D.I. ignition, and CVT transmission systems with complete maintenance schedules and engine specifications.
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Sample pages from the Unison Desert Cat 50 & 90cc Service Manual manual
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Models Covered & Key Technical Specifications
Unison Desert Cat 50 & 90cc — 2007 Consolidated Engineering Blueprint | Desert Cat Series Collection.
- Authorized Current Rating: The battery system is calibrated to 12V–7AMP electrical supply Mapping.
- Critical Climate Specs: For optimal carburetor function, 0.7–0.8 mm governs the spark plug gap Configuration.
- Operational Output Performance: Engine displacement is specified as 49cc (DS50) and 82.5cc (DS90) Benchmarks.
- Fundamental Net Mass: The DS50 requires 227 lbs (103 kg) dry weight Framework, while DS90 supports 243 lbs (110 kg) Range.
- Specific Assembly Torques: Cylinder head bolts are rated at 10–15 ft-lbs (1.4–2.0 kg-m) fastening specification Sequences.
- Core Wattage Specs: Idle speed reaches 1800±100 rpm for stable engine operation Baseline.
Professional Workshop Service Manual & Technical Specifications
Specialized Safety Technical Manual: Unison Desert Cat 50 & 90cc Service Manual Hydraulic-Guide
Equipment-Series: Desert Cat 50, Desert Cat 90 // Technical-Scope: Engine, Frame and Electrical Systems Logic // Equipment-Series: Two-stroke horizontal engines, automatic CVT transmission, drum and disc brake configurations.
| Metric | Value | Calibration-Data |
|---|---|---|
| Engine Displacement | 49cc (50) / 82.5cc (90) | Complete specifications provided |
| Fuel Tank Capacity | 1.3 gallons (5 liters) | Documented across both models |
| Ignition System | C.D.I. with electric and kicker start | Technical reference included |
| Transmission Type | Automatic C.V.T. (continuously variable) | System architecture documented |
| Battery Specification | 12V-7AMP | Electrical reference data |
Diagnostic procedures address the technical foundations of the Unison Desert Cat lineup by consolidating engine, frame, and electrical service procedures, examining carburetor systems and transmission assemblies, and providing comprehensive troubleshooting methodologies for maintenance personnel.
Strategic Architecture
The document encompasses technical information covering dual-displacement two-stroke horizontal engine architecture with specifications for both the 49cc and 82.5cc models. Thoroughly requiring detailed system illustrations, the manual presents engine fuel systems, lubrication pathways, and combustion chamber configurations alongside component inspection procedures. The technical reference encompasses spark plug gap tolerances, idle speed calibration standards, and brake lever free-play measurements for standardized service protocols.
Technical Standard
Safety procedures are documented for engine operation, fuel handling protocols, and battery acid contact prevention across the service and maintenance sections. The manual includes detailed chapters addressing fuel line inspection, throttle cable adjustment procedures, air cleaner maintenance, and spark plug serviceability with electrode wear assessment criteria. Fluid capacities are listed for engine oil tank volume (1 liter), fuel tank capacity (1.3 gallons), and gear oil specifications, ensuring proper lubrication and transmission system functionality across operating conditions.
Technical Threshold
Installation guidelines are provided for the engine removal and reinstallation sequence, carburetor system reassembly, and steering shaft bearing installation with bushing alignment procedures. Tool requirements are listed for the removal of clutch assemblies, driven pulley disassembly using specialized compressors, and flywheel extraction using pulley fixtures. The document provides measurement standards for cylinder bore wear, piston ring gap verification, and connecting rod clearance assessment, enabling systematic component evaluation before reassembly.
Structured Protocol
Brake system specifications are included for front drum brake inspection with lining thickness minimum limits of 1.5mm, rear drum brake configurations with 2.0mm minimum lining specifications, and hydraulic disc brake pad wear documentation. The manual encompasses transmission system procedures for drive belt inspection with width service limits of 14.6mm, weight roller diameter measurement standards, and clutch lining thickness verification at 1mm minimum. Frame system documentation covers front wheel and steering assembly procedures, including tie-rod installation with 278mm ball joint spacing calibration and knuckle spindle bushing inner diameter measurement requirements.
Diagnostic Nexus
The electrical system section documents A.C.G. generator removal and installation, battery voltage inspection standards (13.0-13.2V full charge, 12.3V under charge), ignition coil continuity testing with primary coil resistance standards of 0.1Ω-1.0Ω, and start relay inspection procedures with continuity verification protocols. The comprehensive troubleshooting guide addresses engine starting failures, poor idle performance at low speeds, hard steering conditions, and charging system malfunctions with systematic fault isolation methodologies. This service manual documents torque specifications for engine cylinder head fasteners, frame handlebar mounting bolts, steering shaft nuts, and drive sprocket installation to ensure proper thread engagement security across critical mechanical assemblies.
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