Yamaha Big Bear 350, YFM350FW ATV Service Manual - Factory Diagnostics & Service Procedures (1987-1999)
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Sample pages from the Yamaha Big Bear 350, YFM350FW ATV Service Manual - Factory Diagnostics & Service Procedures (1987-1999) manual
Purchase Information
Technical Specifications
- Document Number / Seller:
- 28755 / Thomas Martin
- File Size:
- 76.26 MB
- File Type:
- Language:
- English
- Pages:
- 294
- Printable:
- Yes
- Estimated Download Time:
- 1.56 Minutes
- Delivery Format:
- Digital (PDF) - Instant Access
- Category:
- ATV
- Brand:
- Yamaha
- Reviewed and Approved:
- Dec 26, 2025
Yamaha Models and Parts Covered in this ATV Manual
- Big Bear 350 (1987-1999)
- YFM350FW (1987-1999)
Complete Manual Information
Yamaha Big Bear 350 & YFM350FW ATV Service Manual: Factory Diagnostics & Service Procedures (1987-1999)
Master the maintenance and repair of your Yamaha utility ATV with this professional-grade Service Manual. Specifically designed for the legendary Big Bear 350 and YFM350FW series, this comprehensive guide provides the exact factory specifications and step-by-step procedures used by certified technicians. Whether you are performing a simple oil change or a complete engine overhaul, this manual ensures your machine stays trail-ready.
This manual is the definitive resource for owners of the 1987-1999 models, covering the robust 350cc air/oil-cooled engine and the sophisticated 4WD drivetrain that made the Big Bear a staple in the ATV world.
Model Coverage & Identification
This manual covers all variations within the 1987 to 1999 production years, including:
- Yamaha Big Bear 350 (Commercial/Trade Name)
- Yamaha YFM350FW (Technical Series Designation)
Verified Serial Number Ranges: To ensure compatibility, check your vehicle identification. This manual applies to machines starting with:
- Vehicle Identification Number (VIN): JY41YW00 * HC000101 (stamped on the left side of the frame)
- Engine Serial Number: 1YW-000101 (stamped on the right side of the engine)
Key Technical Features
- Engine Performance & Tuning: Detailed specs for the 348cc 4-stroke engine, including idle speed (1,450–1,550 r/min) and compression pressure (Standard: 121 psi).
- Valvetrain Precision: Exact clearances for Intake (0.06–0.10 mm) and Exhaust (0.16–0.20 mm) valves to ensure peak engine efficiency.
- Advanced Drivetrain Service: Comprehensive guides for the Middle Gear and Final Gear assemblies, including specific gear lash measurements and shim adjustments.
- Tire & Chassis Specs: Factory recommendations for the low-pressure Bridgestone DH03/DH04 tires and precise torque values for all chassis fittings.
What's Inside this Manual
- General Information: Machine identification, special tool requirements (e.g., Flywheel Puller YM-01404, Compression Gauge YU-33223), and vital safety info.
- Periodic Inspection & Adjustment: Maintenance intervals, air filter cleaning using proper solvents, and spark plug gap settings (0.6–0.7 mm).
- Engine Overhaul: Complete disassembly and reassembly, including camshaft inspection, piston ring end gap limits, and crankshaft runout tolerances.
- Carburetion: Detailed cleaning and adjustment of the fuel system, including the speed limiter for beginner riders.
- Electrical System: Troubleshooting for the CDI ignition, battery specific gravity testing, and circuit breaker inspections.
- Chassis & Driveline: Service procedures for front and rear brakes (including the equalizer adjustment), steering system bushings, and shock absorber preload settings.
Why Choose This Guide?
Stop guessing and start fixing with confidence. This manual provides "Mated Parts" instructions to ensure gears and pistons are reinstalled correctly for longevity. It includes illustrated symbols for quick reference to lubricants (Engine Oil, Gear Oil, Molybdenum Disulfide) and locking agents like LOCTITE. From torque specs for the cylinder head to the exact oil capacity for a periodic change (1.5 L / 1.6 US qt), every detail is included to help you avoid costly mistakes and keep your Yamaha Big Bear 350 running like new.
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Frequently Asked Questions - Yamaha ATV Manual
Is this manual suitable for beginners?
Yes, this Yamaha manual is designed for both professional technicians and DIY enthusiasts. It includes step-by-step procedures with clear illustrations and safety guidelines for ATV maintenance and repair.
What file format will I receive?
You will receive this manual as a PDF file (76.26 MB), which is compatible with all devices. The manual is fully searchable and printable for your convenience.
How quickly can I access the manual after purchase?
You'll receive instant access to your Yamaha ATV manual immediately after payment completion. The download link is valid for 3 days, with lifetime re-download guarantee.
Can I print specific sections of the manual?
Absolutely! This digital manual allows you to print any section you need, from individual pages to complete chapters, making it perfect for workshop use.
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