Yamaha YZ250(G)/LC Service Manual (575 P.)
Documents the YZ250 series two-stroke motocross machine with complete clutch adjustment, carburetor tuning, and transmission maintenance procedures. Includes radiator capacity 1.2L and spark plug specifications.
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Models Covered & Key Technical Specifications
Yamaha YZ250(G)/LC — 1995 Documentary Engineering Blueprint | YZ250 Service Package.
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Authorized Unit Dimensions: The overall length is specified as 2,188 mm (86.1 in) representing the machine's maximum longitudinal measurement Benchmarks.
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Published DPI Rating: Seat height delivers 992 mm (39.1 in) from the ground, establishing optimum rider positioning Standards.
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Reference Securement Values: Cylinder bore measures 68.000–68.014 mm (2.6772–2.6777 in) for precise piston fit Sequences.
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Established Clearance Data: Piston ring end gap requires 0.55–0.75 mm (0.022–0.030 in) installation clearance to maintain operational Baseline.
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Measured Output Rating: Maximum compression ratio reaches 9.0–10.9:1, controlling combustion chamber pressure Requirements.
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Core Physical Specs: Fuel tank capacity supports 7.7 L (1.69 Imp gal, 2.03 US gal) for extended operation Threshold.
Professional Workshop Service Manual & Technical Specifications
Commercial Shop Shop Manual: Yamaha YZ250(G)/LC Troubleshooting-Index
Series-Validation: YZ250, YZ125, YZ450F // Unit-Designations: Motorcycle Systems & Diagnostic-Logic // Reference-Category: Multi-Language Service Documentation with Complete Technical Specifications.
| Document Section | Coverage Area | Validation-Data |
|---|---|---|
| General Information | Machine identification, control functions, pre-operation checklist | Serial numbers, specifications, torque reference points |
| Engine Systems | Cylinder, piston, crankshaft, transmission, clutch assembly | Wear limits, clearances, component specifications |
| Chassis & Suspension | Front forks, rear shock absorber, steering, frame alignment | Adjustment procedures, damping force settings, bearing specifications |
| Brake Systems | Front and rear disc brakes, fluid specifications, bleeding procedures | Brake pad thickness limits, fluid type (DOT #4), inspection intervals |
| Electrical Systems | CDI ignition, spark plugs, wiring diagrams, magneto specifications | Ignition timing, coil resistance values, connector details |
Repair procedures are structured around systematic disassembly sequences that clearly identify component relationships. The manual encompasses carburetor configuration, drive chain alignment, and wheel bearing maintenance, establishing foundational knowledge for technical personnel. Carefully requiring thorough inspection of mated parts, the documentation presents throttle cable routing, brake hose positioning, and fuel system breather arrangements with precise call-outs. Technical notes are provided for transmission oil capacity, coolant specifications, and tire pressure verification. The troubleshooting chapter addresses seasonal maintenance intervals, documenting procedures for every third and fifth race conditions.
Quality checks are addressed for spark plug gap measurement, radiator cap opening pressure testing, and suspension damping force adjustment protocols. The torque specification section references fastener requirements across engine mounting, chassis assembly, and brake component installation, documenting specifications for the primary drive gear, clutch boss, and steering ring nut assembly. Strategic reference material includes component identification diagrams, cable routing overviews, and setting parts selection tables for carburetor jet configuration and sprocket sizing options.
The document provides torque specifications for [component] to ensure proper fastener fatigue prevention throughout critical drivetrain assemblies and frame attachment points.
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