1989-1991 Yamaha YFM250W Moto-4 ATV Service Manual
Comprehensive diagnostics, removal, and maintenance for the Yamaha YFM250W Moto-4 and Big Bear 250. Includes engine, chassis, and electrical systems. Part # 3GN-21740-00-00.
Manual Preview
Sample pages from the 1989-1991 Yamaha YFM250W Moto-4 ATV Service Manual manual
Purchase & Download
Models Covered & Key Technical Specifications
Applied Assembly Workshop Manual: ATV Yamaha YFM250W Moto-4 ATV Service Manual - Precision Maintenance, Diagnostics & Repairs, 1989-1991 Engineering-Archive
Procedure-Type: Workshop Manual | Series-Validation: YFM250W | Procedure-Type: Repair Manual.
- Designated Size Parameters: 11 L (2.42 Imp gal, 2.91 US gal) defines the total fuel tank capacity.
- Verified Installation Footprint: 732 mm (28.8 in) is the overall height for standard operation.
- Nominal Coupling Torques: 8.8 N·m (0.9 kgf•m, 128 psi) signifies the maximum compression pressure limit.
- Defined System Fill: Yamalube 4 (10W30) or SAE 10W30 type SE/SF oil is recommended for the engine and final gear, with a capacity of 2.1 L (1.8 Imp qt, 2.2 US qt).
- Key Power Framework: 12V, 25W/25W x 2 pcs. indicates the headlight bulb wattage for optimal illumination.
- Essential Mass Specs: 216 kg (476 lb) is the basic weight with full fuel tank for stable handling.
Professional Workshop Service Manual & Technical Specifications
Applied Assembly Workshop Manual: ATV Yamaha YFM250W Moto-4 ATV Service Manual - Precision Maintenance, Diagnostics & Repairs, 1989-1991 Engineering-Archive
Procedure-Type: Workshop Manual // Series-Validation: YFM250W // Procedure-Type: Repair Manual.
| Performance-Element | Value | Context |
|---|---|---|
| Model Code | 3GH | Engine starting information. |
| Front Tire | AT22 x 8 - 10 | Tubeless tire specifications for optimal grip. |
| Rear Brake Type | Drum Brake | Provides reliable stopping power. |
| Ignition System | C.D.I. | Manages spark delivery for combustion. |
| Basic Weight | 216 kg (476 lb) | Dry weight for handling assessment. |
The repository is divided into chapters covering general information, specifications, periodic inspection and adjustment, engine overhaul, carburetion, drive train, chassis, electrical systems, and troubleshooting. Procedures are clearly outlined with supporting diagrams.
Testing requirements are specified for engine components, including valve clearance and ignition timing, to ensure optimal performance and longevity.
Clearance measurements are addressed for critical engine parts like pistons, rings, and camshafts, providing detailed specifications for wear limits and allowable tolerances.
Fundamentally requiring proper component alignment retention, this manual documents torque specifications for various fasteners throughout the ATV to ensure secure and reliable assembly.
Special procedures are addressed for tasks such as carburetor adjustment and drive shaft lubrication, guiding technicians through complex maintenance routines.
Verification procedures are included for systems like the electrical and drive train, ensuring all components function correctly after service.
Repair information is provided for common issues and component overhauls, offering step-by-step guidance for effective repairs.
FAQ
Customer Reviews
Read what our customers say about this Yamaha ATV manual and share your own experience.
Add a Review
This policy contains information about your privacy. By posting, you are declaring that you understand this policy:
- Your name, rating, website address, town, country, state and comment will be publicly displayed if entered.
- Aside from the data entered into these form fields, other stored data about your comment will include:
- Your IP address (not displayed)
- The time/date of your submission (displayed)
- Your email address will not be shared. It is collected for only two reasons:
- Administrative purposes, should a need to contact you arise.
- To inform you of new comments, should you subscribe to receive notifications.
- A cookie may be set on your computer. This is used to remember your inputs. It will expire by itself.
This policy is subject to change at any time and without notice.
These terms and conditions contain rules about posting comments. By submitting a comment, you are declaring that you agree with these rules:
- Although the administrator will attempt to moderate comments, it is impossible for every comment to have been moderated at any given time.
- You acknowledge that all comments express the views and opinions of the original author and not those of the administrator.
- You agree not to post any material which is knowingly false, obscene, hateful, threatening, harassing or invasive of a person's privacy.
- The administrator has the right to edit, move or remove any comment for any reason and without notice.
Failure to comply with these rules may result in being banned from submitting further comments.
These terms and conditions are subject to change at any time and without notice.
Reviews (4)