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

69 Pages • 5.25 MB • Instant, Printable PDF

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Unison Models Covered & Key Technical Specifications

Models: Unison Desert Cat 50, Unison Desert Cat 90

Sub-models / Variants: DS50, DS90, 2-Stroke Horizontal, Automatic (C.V.T.)

Model Year: 2007

Technical Data:

  • Engine Displacement: 49cc (DS50), 82.5cc (DS90)

  • Compression Ratio: 7.2:1 (DS50), 6.0:1 (DS90)

  • Spark Plug Gap: 0.7–0.8 mm

  • Idle Speed: 1800±100 rpm

  • Transmission Type: Automatic C.V.T.

  • Electrical System: 12V 7AMP Battery

  • Tire Pressure: 2–10 psi

  • Cylinder Head Bolt Torque: 10–15 ft-lbs (1.4–2.0 kg-m)

Technical Specifications
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Document Number / Seller:
25145 / Douglas Harris
File Size:
5.25 MB
File Type:
PDF
Language:
Pages:
69
Printable:
Yes
Category:
ATV
Last updated / verified
Jun 2, 2026

Unison Manual Features & Content Preview

  • 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

This 69-page factory document serves as the primary technical reference for the Desert Cat ATV series, delivering essential data for fast, accurate diagnostics 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 eliminate guesswork 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.

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. Because this manual is an instant download, you can load it directly onto your shop tablet or print the exact diagrams needed for today's job without waiting for shipping.

Technical Safety Notice
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This official OEM document is intended for professional technicians and skilled operators. Performing service on mechanical equipment involves inherent risks. By purchasing, you acknowledge that RepairLoader provides original manufacturer data for informational purposes. Always prioritize safety: use correct tools, wear protective gear, and consult a certified professional if you are uncertain of any procedure.

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