This yfm400 carburetor is compatible with the following Yamaha models and years:2000-2006 KODIAK 400 (2x4, 4x4, 2WD, 4WD/ 2004-2006 Big Bear 400/ 2004-2006 Bruin 350/ 2007-2011 Grizzly 350/ 2007-2012 Grizzly 450/ 2006-2009 Wolverine 350/2007-2010 Wolverine 450 We know the importance of a carburetor for your riding atv, so we made it in the strict scale of OEM standard to make sure it compatible with your engine,as an alternate OEM parts, it serves as a high performance like your original ones As the key parts to the engine, our 400 big bear carburetor automatically adjusts the fuel supply based on speed and load conditions to ensure smooth engine operation, all parts in this kit are precision manufactured and completed with rigious test, they are all carefully put together to make your engine run smoothly Dust holding capacity is the key for the air filtration system, our kodiak 400 carb filter can effectively capture dust, dirt, and other contaminants to protect the engine,it will extend the service life of your vehicle Feel confident knowing that we stand behind our products with comprehensive after-sale support coverage and responsive customer care,any concerns or issues you may encounter post-purchase could be addressed yfm400 carburetor