1989-1991 Yamaha YFM250W Moto-4 ATV Service & Repair Manual • P/N P/N 3GH-28197-10

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Yamaha Models Covered & Key Technical Specifications

Models: Yamaha YFM250W Moto-4, Yamaha Moto-4 250
Model Years: 1989–1991
Serial Numbers: USA Starting: JY43GHA0KC000101, CDN Starting: JY43GHW0KC047101, Frame Starting: 3GH-047101, Engine Starting: 3GH-000101 (USA) and 3GH-047101 (Other)
Technical Data:

  • Engine: 229.6 cc, 4-stroke, SOHC, air-cooled, single cylinder
  • Compression Ratio: 8.8:1
  • Compression Pressure: 900 kPa (128 psi)
  • Fuel Tank Capacity: 11 L (2.91 US gal)
  • Transmission: 5-speed constant mesh with sub-transmission
  • Final Drive: Shaft drive
  • Starting System: Electric and Recoil starter
Technical Specifications
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Document Number / Seller:
28754 / Brian Wright
File Size:
60.66 MB
File Type:
PDF
Language:
English
Pages:
320
Printable:
Yes
Category:
ATV
Last updated / verified
Dec 26, 2025

Yamaha Manual Features & Content Preview

Yamaha YFM250W Moto-4 1989–1991 Service Documentation

Whether you are equipping a professional repair facility or maintaining your own ATV, having the right reference material is critical. This official Yamaha publication (P/N 3GH-28197-10) delivers exactly what technicians need: 320 pages of unfiltered, OEM-level data for the 3GH-series build. Because this is an instant PDF download, you can bypass shipping delays and pull up the exact specifications you need on a shop tablet immediately.

Technical Coverage

This manual thoroughly documents engine, chassis, electrical, and drive system specifications. It provides a complete descriptive breakdown of engine removal, disassembly, and assembly cycles alongside periodic inspection adjustments. Technicians will find 47 detailed exploded-view diagrams and 21 specialized maintenance flow charts that map out the ignition, charging, and signal systems. To maintain a safe working environment in the bay, always review the manufacturer safety precautions and warning labels detailed in the opening sections before lifting or dismantling the vehicle.

Specification Highlights

Expect precise factory data tailored to regional market variants of the YFM250W. The documentation outlines crucial thresholds, including a **cylinder head warp limit of

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.

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