Hyosung Comet 250 / Comet 125 Service Manual (163 P.)

Complete maintenance and repair guide for V-2 cylinder Comet models. Factory technical reference with valve clearance, compression specs, and wiring diagrams. PN 99000-94710

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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.

Hyosung Models Covered & Key Technical Specifications

Models: Hyosung Comet 250, Hyosung Comet 125
Sub-models / Variants: 125cc, 250cc
Build 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
Oct 3, 2025

Hyosung Manual Features & Content Preview

Technical Scope of the Hyosung Comet 250/125 Manual

  • Covers 2002 Hyosung Comet 250 and Comet 125 V-twin motorcycles including chassis and engine specifications
  • Original OEM publication P/N 99000-94710
  • Contains 47 exploded-view diagrams and 15 torque specification tables
  • File delivered as a direct download the moment payment clears
  • Page spreads stay legible when printed at original size
  • This 163-page service reference provides the factory-authorized diagnostic benchmarks for the dual-cylinder 250cc and 125cc Comet engine builds

Component and Service Documentation

The 2002 Hyosung Comet 250 and Comet 125 service publication details the full scope of engine, chassis, and electrical system upkeep. The content starts with comprehensive general information, identification of serial number locations, and essential fuel and oil recommendations for four-stroke maintenance. Detailed sections follow on the V-twin engine internals, including disassembly, cylinder head cover service, piston work, and crankcase management. Further chapters map out the complete fuel system, covering the dual carburetor assembly, pump relay diagnostics, and tank/cock hardware, alongside an extensive electrical system section documenting ignition, charging, and interlock configurations.

Specification Highlights

Technical data previews include specific tolerance values for the Comet series. Valve clearance for the intake is listed at 0.1–0.2 mm in the cylinder head specification table. Engine oil capacity for a standard oil change is documented at 1,450 ml for both models. The standard fuel tank volume for the 2002 Hyosung Comet 250 and Comet 125 is calibrated to 17.0 liters total. Factory torque values for the engine mounting bolts are specified at 40–60 N·m in the removal and reinstallation data section. Reference what an OEM service publication covers to understand the technical depth provided in this factory documentation.

Reference only — always consult a certified technician before performing service on this equipment. An official 163-page Hyosung OEM service manual covering the 2002 Comet 250 and Comet 125, documenting engine, chassis, electrical, and fuel system specifications for the twin-cylinder platform.

Document Reference: 99000-94710

Manual FAQ, Purchase & Download Details

Does this manual include component parts diagrams for assemblies like the front wheel? keyboard_arrow_down

Document contains component parts illustrations, such as the front wheel breakdown, to show the basic principles of operation for system components.

What system or chapter areas receive the most detailed coverage in the document? keyboard_arrow_down

Service manual provides comprehensive sections covering the engine, electrical system, chassis, and fuel system. These groups are structured to provide information on the main components and their associated maintenance procedures.

Which engine and transmission chapters are featured in this service document? keyboard_arrow_down

Manual includes dedicated chapters for the engine and transmission, providing specifications and reference data for the two-cylinder engine and five-speed transmission. These sections cover information relevant to the V-2 engine configuration and the mechanical systems of the Comet models. Users can navigate these through the provided group index.

Can I find technical references for electrical components in the manual? keyboard_arrow_down

Document contains an electrical system section that includes specification tables for items such as battery capacity, fuse ratings, and ignition timing.

Is there a table that lists the valve clearance references and tightening specs for maintenance? keyboard_arrow_down

Document contains specification tables and periodic maintenance charts that list intake and exhaust valve clearance ranges for the engine. These tables provide the technical reference values necessary for cold-state checks.

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