Will a big bear 400 head fit on a yfm350 warrior?

A big bear 400 head will not fit directly on a Yamaha YFM350 Warrior engine due to differences in engine design and specifications. While both are part of Yamaha's ATV lineup, their cylinder head dimensions and mounting points are likely to vary significantly. Modifications might be necessary, but it's generally not a straightforward swap. Always consult with a mechanic or ATV specialist for accurate compatibility and potential modifications.