1992 Yamaha YFB250D Utility-ATV Service Manual
Addresses YFB250D systems including carburetor, electrical, and engine. PN 4BD-21110-00-R4.
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Models Covered & Key Technical Specifications
Yamaha YFB250D (1992) - Service Manual
Comprehensive service and repair guide for the 1992 Yamaha YFB250D Utility-ATV.
- Engine Specifications: 249 cc air-cooled 4-stroke OHC single-cylinder.
- Carburetor Type: Mikuni BSR26 (VM26SS).
- Ignition System: CDI.
- Transmission Type: Constant mesh, 5-speed.
- Front Suspension: Independent, double A-arm with 5-way preload adjustable shocks.
- Rear Suspension: Swing arm with adjustable shock absorber.
Professional Workshop Service Manual & Technical Specifications
Yamaha YFB250D Utility-ATV Parts Manual: Yamaha YFB250D Parts Manual - Complete Service Guide for Model 1992 Maintenance-Registry
Engine-Component Focus: Cylinder Head Assembly // Assembly-Group: Cylinder Head // Subsystem-Focus: 125.3 cc. Logic // Torque-Specifications: 17 N.m. is the torque value for the cylinder head bolts.
| Technical Specs Table | Assessment-Element | System-Path | Calibration-Spec |
|---|---|---|---|
| Cylinder Bore | 66.0 mm | Standard measurement | |
| Stroke | 72.0 mm | Standard measurement | |
| Compression Ratio | 9.2:1 | Specification range | |
| Fuel System | Carburetor | Mikuni VM26SS | |
| Lubrication System | Wet Sump | Oil Capacity: 1.7 L | |
| Spark Plug Type | NGK D7EA | Specified ignition component |
TOC Summary Block Technical chapters are organized around:
- Crankshaft - Piston Assembly
- Cylinder
- Cylinder Head
- Carburetor
- Drive Shaft
Cylinder Head Components
Thoroughly requiring cylinder head assembly, this manual provides detailed specifications for all components. The documentation addresses cylinder head cover specifications, including torque values for secure thread engagement. It also details the gasket specifications for the cylinder head. Assembly instructions are detailed for the cylinder head components to ensure proper configuration. Hydraulic schematics are included for the cylinder head, aiding in understanding fluid dynamics. The torque statement specifies torque specifications for cylinder head bolts to ensure proper thread engagement security.
Carburetor Service
The carburetor service section details the pilot screw adjustment, jet specifications, and float chamber adjustments. The documentation addresses main jet and pilot jet sizes, along with needle settings. Assembly instructions are detailed for the carburetor components, ensuring proper configuration. Hydraulic schematics are included for the fuel delivery system, aiding in understanding fuel flow. The torque statement specifies torque values for carburetor mounting bolts to ensure proper thread engagement security.
Drive Shaft Maintenance
The drive shaft maintenance section details specifications for thrust shims and ring gear shims. The documentation addresses drive shaft components, including bearing and oil seal replacements. Assembly instructions are detailed for the drive shaft components, ensuring proper configuration. Hydraulic schematics are included for the drive shaft assembly, aiding in understanding lubrication flow. The torque statement specifies torque values for drive shaft flange bolts to ensure proper thread engagement security.
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