Yamaha Big Bear 250 runs rough


Active Member
Nov 19, 2020
Lowell, AR

  1. 700-4
Figured I'd ask here, seeing as how there's some really smart folks here...
My son's four wheeler, a Yamaha Big Bear 250, starts and runs, but runs pretty rough and "surges" and if left alone, eventually dies. It idles rough and when under throttle. It has a new OEM carburetor, and I always use ethanol-free gasoline.
Any ideas as to what could be the problem? I'm wondering if it has a fuel line problem, either an obstruction or clog, or clogged or bad fuel filter.

I've attached a quick video of it. What do you think is going on? Thanks all!


  • PXL_20210731_220637867~4.mp4
    7.6 MB · Views: 1
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