1998 Yamaha YZ250(K)/LC Workshop & Repair Manual

This manual covers the YZ250(K)/LC, YZ250LC, and YZ250K1 models. It includes detailed procedures for maintenance, repair, and adjustments. PN 5DJ-28199-30.

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Document Details

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Document Number / Seller:
30793 / Brian Bell
File Size:
39.15 MB
File Type:
PDF
Language:
English, French, German, Spanish
Pages:
244
Printable:
Yes
Category:
Motorbike
Last updated / verified
Apr 5, 2025

Models Covered & Key Technical Specifications

Yamaha YZ250(K)/LC, YZ250LC, YZ250K1 (1998) - Workshop & Repair Manual This manual provides a complete guide for servicing your motorcycle.

  • Designated Engine Type: Liquid-cooled 2-stroke, gasoline is the primary power source.
  • Specific Displacement: 249 cm³ defines the engine's working volume.
  • Nominal Compression Ratio: 8.7-10.6:1 is the standard ratio for optimal combustion.
  • Design Ignition System: CDI magneto controls the ignition timing accurately.
  • Engineered Fuel System: Premix (30:1) ensures proper lubrication for the engine.
  • Essential Transmission Type: Constant mesh, 5-speed transmission provides versatile gear ratios.

Manual Description & Preview

Structured Factory Parts Manual: Yamaha YZ250(K)/LC, YZ250LC, YZ250K1 Motorcycle Workshop & Repair Manual (1998) - Precision Diagnostics & Maintenance Factory-Standards

Product-Line: Motorcycle // Assembly-Group: Engine/Chassis // Service-Level: Factory-Standards

Sequentially establishing maintenance procedures, this document details diagnostic protocols and component specifications for the Yamaha YZ series.

Metric Technical-Path Context
Engine Type Liquid-cooled 2-stroke, gasoline Primary power source specification.
Displacement 249 cm³ Engine working volume data.
Compression Ratio 8.7-10.6:1 Optimal combustion parameter.
Ignition System CDI magneto Ignition timing control mechanism.
Lubrication Premix (30:1) Engine lubrication method.
Transmission Constant mesh, 5-speed Gear ratios and operational type.

Following OEM groupings, the manual includes detailed sections on the engine, chassis, electrical components, and tuning.

This manual meticulously documents the engine, detailing procedures for the cylinder head, piston, clutch, and transmission systems. It also provides analytical insights into chassis components, including the front and rear suspension, wheels, and brakes.

This manual documents torque specifications for critical components to ensure proper rotational loosening prevention.

FAQ

Identify the **correct** service interval parameters for routine maintenance. keyboard_arrow_down

Every race service interval requires inspection of the clutch, brake lever, and rear brake pedal for proper operation and adjustment.

What procedures **documented** system architecture for the ignition system? keyboard_arrow_down

CDI magneto controls the ignition timing; minimum spark gap is 6 mm (0.24 in) and primary winding resistance is 0.20-0.30 Ω at 20°C (68°F).

Determine the **precise** tool requirements for servicing the front fork? keyboard_arrow_down

Special tools like the Fork seal driver (YM-01442/90890-01442) and Damper rod holder (YM-1423/90890-01423) are required for front fork disassembly and adjustment.

What specifications **proper** electrical values for the CDI unit? keyboard_arrow_down

Source coil 1 resistance is 720-1,050 Ω (Green/White-Black/Red), Source coil 2 resistance is 44-66 Ω (Black-Green/Blue), and Pickup coil resistance is 245-372 Ω (White/Blue-White/Red).

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