Sun Coast Cycle Sports offers used OEM parts for the Yamaha Big Bear, the utility ATV family that served as Yamaha's workhorse quad from 1987 through 2012. The Big Bear name encompasses several models across its 25-year history: the original Big Bear 350 4x4 (YFM350FW, 1987-1999), the Big Bear 400 (YFM400, 2000-2012), and the brief Big Bear 250 (2007-2009). All were powered by air-cooled single-cylinder four-stroke engines with Ultramatic CVT or manual transmissions, shaft drive, and selectable 2WD/4WD. The Big Bear was Yamaha's first 4x4 ATV and laid the groundwork for the Grizzly, Kodiak, and Wolverine platforms that followed. Parts in our inventory have been inspected by our technicians and ship with individual photos from our Odessa, Florida facility.
Big Bear models and parts compatibility
| Model | Years | Engine | Key features |
|---|
| Big Bear 350 (YFM350FW) | 1987-1999 | 348cc air-cooled single | Yamaha's first 4x4 ATV, manual 5-speed with reverse, shaft drive |
| Big Bear 400 (YFM400) | 2000-2012 | 401cc air-cooled single | Ultramatic CVT (most years) or manual transmission, selectable 2WD/4WD, shaft drive |
| Big Bear 250 (YFM250) | 2007-2009 | 249cc air-cooled single | 2WD only, chain drive, entry-level utility |
Within each Big Bear model, parts interchange freely across all production years. The Big Bear 350 and Big Bear 400 share the same basic utility ATV design philosophy but use different engines and in many cases different frames, making most components not interchangeable between the 350 and 400. The Big Bear 250 is a completely separate entry-level platform sharing nothing significant with the 350 or 400. The Big Bear 400 engine is related to the Kodiak 400 and Wolverine 350/450 platforms, and some engine internals may cross between these models. The Big Bear does not share parts with the larger Grizzly 550/600/660/700 ATVs.
Common Big Bear failure points and replacement parts
Starter clutch wear (Big Bear 400): The one-way starter clutch can wear over time, causing the starter to spin without engaging the engine. This is a known issue across Yamaha's utility ATV lineup and requires removing the flywheel cover for replacement.
CVT belt wear (CVT-equipped models): Big Bear 400 models with the Ultramatic CVT require periodic belt inspection and replacement. Heavy loads and mud riding accelerate belt wear.
Carburetor deterioration: All Big Bear models are carbureted and susceptible to ethanol damage, stuck floats, and clogged jets from stale fuel. Seasonal storage without fuel stabilization is the most common cause of carb-related starting and running issues.
Shaft drive maintenance: The shaft drive system needs periodic rear drive fluid changes and seal inspection. Neglected seals can leak gear oil, and worn U-joints produce a clunking noise under load changes.
Electrical system age (Big Bear 350): Original Big Bear 350s from the late 1980s and 1990s are now 25-35+ years old. Wiring harness deterioration, corroded connectors, and failing switches are inherent to any machine of this vintage.
Commonly replaced Big Bear parts
- CVT drive belt (CVT models) or clutch plates (manual models)
- Starter clutch and starter motor
- Carburetor rebuild kit and fuel system components
- Shaft drive seals and U-joint
- Wheel bearings and hub assemblies
- Brake pads, shoes, and brake hardware
- Plastics, fenders, and racks
- Stator and rectifier/regulator
Frequently asked questions
Q: Are Big Bear 350 and Big Bear 400 parts interchangeable?
The Big Bear 350 and 400 are different platforms with different engines and in many cases different frames. Most components are not directly interchangeable. Some generic accessories like cargo racks, controls, and minor electrical items may be shared, but engine, transmission, and chassis parts are model-specific.
Q: Does the Big Bear 400 share parts with the Kodiak 400?
The Big Bear 400 and Kodiak 400 share the same engine family and some chassis components. The two models overlap significantly in design, and many parts cross between them. Confirm specific part numbers before assuming compatibility, as there are year-specific differences in both models.
Q: What replaced the Big Bear?
The Big Bear 400 was discontinued after 2012. Its role in the Yamaha lineup was absorbed by the Kodiak 450 and the smaller Grizzly models, which offer similar utility capability with updated technology including fuel injection and optional EPS.
Inspected by Powersports Technicians • Only One in Stock • Ships Fast from Florida
