Hyosung Comet 250 / Comet 125 Factory Service Manual (P/N 99000-94710)

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Hyosung Models Covered & Key Technical Specifications

Models: Hyosung Comet 250, Hyosung Comet 125
Sub-models / Variants: 125cc, 250cc
Model Years: 2002
Serial Numbers: GT250-000001 (Engine Example)
Technical Data:

  • Engine type: V-2 cylinder, Four-stroke, DOHC, air-cooled and oil-cooled
  • Piston displacement: 249 cm³ (Comet 250), 124.7 cm³ (Comet 125)
  • Bore: 57.0 mm (Comet 250), 44.0 mm (Comet 125)
  • Stroke: 48.8 mm (Comet 250), 41.0 mm (Comet 125)
  • Transmission: 5-speed constant mesh, 1-down 4-up pattern
  • Carburetor: BDS 26TYPE (DOUBLE)
  • Fuel tank capacity: 17.0 liters
  • Engine oil capacity (oil change): 1,450 ml
  • Ignition timing: 13° B.T.D.C. at 2,000 rpm and 30° B.T.D.C. at 6,000 rpm
Technical Specifications
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Document Number / Seller:
23718 / Dennis Gonzalez
File Size:
13.65 MB
File Type:
PDF
Language:
English
Pages:
163
Printable:
Yes
Category:
Motorbike
Last updated / verified
Jun 24, 2026

Hyosung Manual Features & Content Preview

  • Original OEM publication P/N 99000-94710 covering the 2002 Hyosung Comet 250 and 125 V-twin motorcycles
  • 163-page factory reference providing diagnostic benchmarks for the dual-cylinder builds
  • Contains 47 exploded-view diagrams and 15 torque specification tables for precise bench work

Component and Service Documentation

The 2002 Hyosung Comet service publication outlines maintenance procedures for the engine, chassis, and electrical systems. It begins with foundational information, including serial number locations and essential four-stroke fluid recommendations. From there, it dives deep into the V-twin engine internals. You will find factory benchmarks for cylinder head cover servicing, piston teardowns, and crankcase management. The documentation maps out the complete fuel system as well. It details the dual carburetor assembly, pump relay diagnostics, and tank hardware. An extensive electrical section thoroughly covers ignition, charging, and interlock configurations. Working with these internal components requires proper workshop safety gear and a solid mechanical foundation to prevent equipment damage or personal injury.

Specification Highlights

Accurate technical data is crucial for preventing costly assembly errors in the shop. This manual provides the specific tolerance values required for the Comet series. For instance, intake valve clearance is listed at 0.1–0.2 mm. Standard engine oil capacity requires exactly 1,450 ml. The fuel tank volume is calibrated to a total of 17.0 liters. During reassembly, the factory specifies 40–60 N·m of torque for the engine mounting bolts. Having these exact numbers directly on your workbench streamlines the diagnostic process and ensures factory-level precision.

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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