1999 Yamaha YZ250(L)/LC Service Manual

Diagnostic procedures and component service for Yamaha YZ250(L)/LC models. Publication 5CU-28199-30 covers inspection, basic maintenance and tuning.

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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.

Yamaha Models Covered & Key Technical Specifications

Models: Yamaha YZ250LC, Yamaha YZ250L1, Yamaha YZ250(L)
Sub-models / Variants: USA, CDN, AUS, NZ, ZA, EUROPE
Trade Names: YZ250, YZ Series
Build Years: 1999
Technical Data:

  • Engine displacement: 249 cm³
  • Engine type: Liquid cooled 2-stroke, single cylinder
  • Compression ratio: 8.8–10.3:1
  • Carburetor: PWM38/KEIHIN
  • Transmission: Constant mesh, 5-speed
  • Fuel capacity: 8.0 L (2.11 US gal)
  • Spark plug: BR8EG/NGK
  • Piston clearance: 0.045–0.050 mm
Technical Specifications
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Document Number / Seller:
30794 / Donna Harris
File Size:
5.51 MB
File Type:
PDF
Language:
English, French, German, Spanish
Pages:
244
Printable:
Yes
Category:
Motorbike
Last updated / verified
Nov 20, 2025

Yamaha Manual Features & Content Preview

1999 Yamaha YZ250(L)/LC Service Manual Documentation

  • Covers 1999 Yamaha YZ250(L)/LC competition motocross machines, including YZ250LC (Europe), YZ250L1 (USA), and YZ250(L) (CDN, AUS, NZ, ZA) variants
  • Official Yamaha publication 5CU-28199-30, identifying the 1999 racing model launch specifications
  • Contains 83 pages of illustrated exploded-view diagrams, torque tables, and cable routing schematics for engine and chassis systems
  • Delivered as a direct download the moment payment clears
  • Indexed PDF search covers every chapter and appendix
  • This 1999 first edition is the technical reference for the 5CU model series build — the specific manual for tuning and maintenance of the 249 cm³ liquid-cooled powerplant

Manual Contents Overview

The 1999 Yamaha YZ250(L)/LC service manual documents essential diagnostic procedures and component service routines. This publication provides the necessary data for internal engine overhaul, transmission maintenance, and chassis setup, including detailed exploded diagrams for the cooling, fuel, and electrical systems. It outlines the specific steps for competition preparation and regular maintenance cycles essential for this 2-stroke racing machine.

The document includes extensive technical specifications for the 1999 Yamaha YZ250(L)/LC, detailing torque values for engine mounts, steering hardware, and brake components. The technical data preview lists a piston-to-cylinder clearance of 0.045–0.050 mm and a primary reduction ratio of 3.000 for the constant-mesh transmission. what an OEM service publication covers provides further context for these factory-level technical details.

Engine and Chassis Specification Highlights

Engine maintenance documentation includes data for the 5CU-series Keihin PWM38 carburetor, including jetting baselines. Coolant system capacity is documented at 1.20 liters. Spark plug gap is specified at 0.5–0.6 mm. The chassis section documents rear shock absorber rebound damping and compression force adjustment. Note: This page is a contents overview for the manual. It does not provide repair or diagnostic instructions. An official 244-page Yamaha OEM workshop manual covering the 1999 YZ250(L)/LC, documenting engine, chassis, electrical, and fuel-injection specifications for the 5CU-series racing machine.

Manual FAQ, Purchase & Download Details

Can I find technical reference categories like tightening specifications, valve clearance data, and tolerance charts in this document? keyboard_arrow_down

Manual includes specification tables that provide technical reference values and tightening specifications for the covered engine and chassis systems.

Which sections contain wiring diagrams, electrical connector pinout references, and harness information? keyboard_arrow_down

Chapter 6 is dedicated to electrical components and contains the wiring diagram for the machine. These pages also reference electrical system checks and connector information.

What information regarding exploded views and component breakdown illustrations does the manual contain? keyboard_arrow_down

Manual features exploded diagrams at the start of each removal and disassembly section to identify parts and their order. These illustrations help show component arrangement and sequence for the engine and chassis assemblies. Accompanying job instruction charts also provide details for these exploded views.

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