2005-2006 Yamaha Bruin 250 / Big Bear 250, YFM250BT ATV Factory Service Manual (P/N LIT-11616-18-41)
Yamaha Models Covered & Key Technical Specifications
Models: Yamaha YFM250BT
Sub-models / Variants: USA, CAL (California), CDN (Canada)
Model Years: 2005–2006
Technical Data:
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Engine: Air-cooled 4-stroke, SOHC, single cylinder
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Displacement: 229.6 cm3
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Carburetor: MIKUNI BST34/1
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Transmission: Constant mesh 5-speed
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Starting System: Electric and recoil starter
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Tire Size (Front/Rear): AT22 x 7-10 / AT22 x 10-10
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Spark Plug: NGK DR7EA
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Brake System: Drum brakes (front), sealed drum (rear)
Yamaha Manual Features & Content Preview
2005-2006 Yamaha YFM250BT Service Manual: Technical Reference & Specs
- Details the 2005–2006 Yamaha YFM250BT ATV, documenting engine, chassis, and electrical specifications across USA, California, and Canadian configurations
- Official Yamaha publication LIT-11616-18-41, first edition (July 2004)
- Features 12 detailed wiring schematics and 34 indexed exploded-view diagrams
- Delivers 600 pages of technical reference, including lubrication routing and torque specifications
- Serves as the baseline technical reference for the YFM250BT, highlighting critical updates from the previous YFM250XL and YFM250XN models
What's Inside the YFM250BT Manual
This official factory publication provides a complete breakdown of the 2005–2006 Yamaha YFM250BT. Rather than a basic user guide, it delivers in-depth technical documentation for maintenance, troubleshooting, and full engine overhauls. The reference material spans nine chapters, detailing precise periodic inspection procedures, carburetor jetting data, and complete engine teardown sequences. Mechanics will find exact service schedules for valves, spark plugs, and drivetrain components, alongside structural sections focusing on rear brake adjustments and steering system geometry.
Key Technical Specifications
Beyond structural diagrams, the document is heavily driven by hard data. It lists critical factory specifications, such as the target engine idle speed of 1,400–1,500 RPM and an intake vacuum of 30.7 kPa. Fluid capacities are clearly defined, including the 12-liter fuel tank, while assembly metrics like the 22 Nm cylinder head bolt torque ensure precision during rebuilds. Working on ATVs involves inherent physical risks, and proper mechanical procedures should always prioritize safety; the data provided in this overview is for general reference, while the complete manual provides the authoritative metrics required for safe, accurate maintenance by experienced DIYers and professional technicians.
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