Yamaha YFB250D ATV 1992 Parts Catalog (PN 4BD-21110-00-R4)

This 1,325-page PDF combines 22 Yamaha Genuine Parts Catalogue sections for 1992-2000 YFB250 Timberwolf 2WD and YFB250FW Timberwolf 4WD ATVs. It is suited to repair shops, parts-counter staff, and experienced owners who can match an assembly to an exploded fiche and need original Yamaha part-number references before ordering. It is a parts-identification set, not a repair manual.

• PDF makeup: 664 pages cover 12 YFB250 2WD and state-specific catalog sections; 661 pages cover 10 YFB250FW 4WD and state-specific sections.
• 2WD model coverage: YFB250D and D_MNH (1992), YFB250E and E_MNH (1993), YFB250F (1994), YFB250G and G_MNH (1995), YFB250H/YFB250UH and H/UH_MNH (1996), YFB250UJ and UJ_MNH (1997), and YFB250UK (1998). The MNH sections carry the Maine and New Hampshire taillight-kit applications.
• 4WD model coverage: YFB250FWF (1994), YFB250FWG and FWG_MNH (1995), YFB250FWH and FWH_MNH (1996), YFB250FWJ and FWJ_MNH (1997), YFB250FWK (1998), YFB250FWL (1999), and YFB250FWM (2000).
• Engine fiches cover the cylinder head, cylinder, crankshaft-piston group, valves, camshaft-chain drive, oil pump, intake or air filter, carburetor, exhaust, crankcase, and crankcase covers.
• Drivetrain breakdowns identify the clutch, transmission gears, middle drive gear, drive selector, shift cam and forks, shift shaft, drive shafts, and rear axle gear case components.
• Chassis and 4WD assemblies include the frame, steering, front and rear wheels, front brakes, suspension, rear arm, and the front differential and related shafts used on YFB250FW models.
• Electrical and body sections show the generator, starting motor, starter clutch, CDI unit, rectifier/regulator, relays, ignition coil, wire harness, switches, lights, fenders, guards, fuel tank, seat, cables, labels, and color-specific trim. Each fiche pairs callout numbers with Yamaha part numbers, quantities, and application remarks.

Model and Serial Identification

The cover sheets pair the retail model names with production codes such as 4BD8, 4BDB, 4BDH/4BDE, 4KD1, 4KD4, 4KD8, 4KDF, 4KDK, and 4KDL. Several also state a starting VIN or initial frame and engine number: 1994 YFB250F, JY44BDA0RA11310; 1994 YFB250FWF, JY44KDA0RA000101; 1995 YFB250G, 4BD-148101; 1995 YFB250FWG, 4KD-034101; 1996 YFB250H, 4BD-252101; 1996 YFB250FWH, 4KD-077101; 1998 YFB250FWK, JY44KDW0WA111515; and 1999 YFB250FWL, JY44KDW0XA118196. Each range is marked “and following.” Check the ATV’s model/production identification before choosing a fiche; the model year alone does not separate every regional, color, or running change.

Part-Number Interpretation and Ordering

The foreword explains Yamaha’s 12-digit part-number format, including model, basic, design-change, color, and size codes, plus the separate numbering pattern used for standard hardware. It also defines superseded-number notation, alternate parts, quantity remarks, and indented subassemblies. That context helps distinguish an original application from an alternate or later replacement instead of treating every line on the page as interchangeable.

The YFB250D cylinder-head fiche identifies the NGK D7EA spark plug, while later catalog sections include model-specific alternate applications. Transmission pages identify the individual gear wheels and pinions. Middle-drive, rear-axle, and 4WD front-differential fiches list selectable shims by thickness and Yamaha part number, and the crankshaft-piston pages separate standard from oversize pistons and ring sets.

Ordering a piston or ring set by appearance alone can leave the bore fit incorrect and damage the new parts. Selecting a drive-gear shim without the required setup measurements can produce improper gear mesh and damage gears or bearings. The catalog identifies the available parts, but the measurement and setup procedures belong to the applicable service manual. Its foreword also directs users to the latest factory parts information when preparing an order, so current supersessions and availability should be confirmed before purchase.

Catalog Scope

This PDF supports parts identification, repair planning, and assembly cross-reference. It does not provide troubleshooting, removal and installation instructions, disassembly sequences, torque tables, wear limits, adjustment procedures, or circuit wiring diagrams. The electrical pages are exploded parts views, not electrical schematics.

Some cover sheets reference separate Yamaha owner’s, assembly, and service publications. Referenced service-manual part numbers include LIT-11616-YB-26, supplement LIT-11616-09-51, LIT-11616-YB-27, and LIT-11616-09-11; those manuals are not included in this PDF. Before beginning a repair, secure the ATV, isolate the battery when working on electrical components, and follow the correct service manual rather than treating an exploded view as a disassembly sequence.