This was the greatest investment i have made for my 350 raptor. This Jet Kit helped the hesitation go away in the carburetor and helped increase power. I would certainly recommend this to a friend, if your ATV has an hesitation in the carburetor.
Moose Dynojet Jet Kit - Stage 1
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This kit would fit your 2000 Yamaha big bear 400 4x4. Just be sure to correctly select the Year/Make/Model of your bike before ordering so we can be sure to send you the correct kit for your bike. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.