Big Bear 350 Problems

Written by teresa starr
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Big Bear 350 Problems
Yamaha introduced the Big Bear 350 as the first 4x4 in 1987. (black atv image by Dumitrescu Ciprian from

A Big Bear 350 is an all-terrain vehicle first introduced in 1987 by Yamaha. With the earlier versions as well as the later versions, 1997 and above, there are a handful of problems that riders can and may experience. In most cases, these issues can be fixed by making a few adjustments or performing routine maintenance.

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Torque Issues

Even later models of the Big Bear 350 have been known to have torque and throttle problems. This means that when the rider cranks the engine and begins to ride, it will eventually lose its torque, perhaps even after 5 to 10 minutes. If this happens, the ATV will eventually act as if it is flooding out. These problems could be due to a cracked or sticky float, or the spark plug might need to be replaced. As with any vehicle, it is best to have a certified dealer or mechanic take a look and potentially fix the problem.

Throttle Issues

On older models, the Big Bear 350 has been known to eventually experience throttle issues, causing the ATV to run terribly. When this happens, the driver might think that the vehicle isn't receiving enough gas, but in actuality, it could mean that the Big Bear needs to warm up for a moment before racing off. Occasionally, cleaning the air filter and dissembling the carburettor could fix this problem, but a assembling a new carburettor kit could be the answer. A Yamaha specialist should be contacted to discuss any throttle problems.


Some riders who own a Big Bear 350 have experienced transmission problems. With a blown transmission, it will either need to be replaced or inspected by a certified Yamaha specialist. Big Bears aren't generally made to go past 40 MPH, so if a rider forces the ATV to go any faster ,the transmission could experience problems or become damaged. To prevent transmission failure, do not overwork the vehicle and force it to run at a higher speed.

Carburettor Issues

If a Big Bear 350 is idling up extremely high and then cutting off, the ATV will most likely be experiencing carburettor issues. If you're experiencing any carburettor issues, the first step to try to resolve these problems is by removing the carburettor and soaking it for 24 to 48 hours in a carburettor cleaner. Once the carburettor has soaked, allow it to dry. If cleaning the carburettor doesn't work, a certified Yamaha professional could easily assess the problem and how to fix the carburettor issue.

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