Unison Desert Cat 50 & 90cc Service Manual (OEM)

• Covers 2007 Unison Desert Cat 50 and 90cc ATVs, documenting both the 49cc and 82.5cc 2-stroke horizontal engine variants
• Original OEM publication featuring clear assembly illustrations for every major system
• Contains 47 exploded-view diagrams and 14 technical torque specification tables for critical fasteners
• Provides factory-authorized settings for the Mikuni M1A and M2A carburetor systems used across the DS50 and DS90 range
• Includes comprehensive coverage for the CVT transmission, stator assembly, CDI module, drum brake assemblies, oil injection pump, reed valve, and steering knuckles
• Features essential wiring diagrams, electrical flowcharts, cable routing drawings, suspension schematics, carburetor cross-section views, and ignition timing charts

This 69-page factory PDF document (P/N: UDC-07–5090) serves as the primary technical reference for the Desert Cat ATV series, delivering essential data for fast, accurate troubleshooting and repair in any professional or home workshop. Chapters detail the fuel system, lubrication, cooling, combustion components, transmission, and frame assemblies.

Working on motor vehicles requires precise data to maintain factory safety standards. Always verify system integrity and use appropriate personal protective equipment before conducting test procedures or applying torque to chassis components.

The specification tables streamline diagnostic workflows on the bench. You will find definitive engine data including cylinder head flatness limits, piston-to-cylinder clearance, and crankshaft run-out specifications. Electrical reference values cover the A.C.G. generator, starter motor, and ignition coil testing parameters. The manual details step-by-step instructions for tasks that typically require an expensive dealership visit, such as top-end engine rebuilds, CVT clutch replacement, and autolube pump calibration.

Crucial assembly figures are clearly mapped out for immediate use. For instance, the engine section dictates a cylinder head bolt torque of 10–15 ft-lbs (1.4–2.0 kg-m). You also get exact maintenance parameters like the use of SAE90 gear oil, the correct NGK BPR8HS spark plug, and a brake lever free play requirement of 15–20 mm. Having these verified factory clearances readily available prevents improper component mating, significantly reducing unbillable diagnostic time on the lift.