Dude those quads are sick, I love the yz426 400ex hybrid. But I would go with the crf450r 400ex hybrid, you should keep it full Honda lol.
Dont know what the deal was with them...both bikes would over heat real easy..I did every thing I could to help them...but they would over heat so I had to sell them off...over sized rads, engine ice, large water pump...only thing I didnt do to them was install fans...for that reason I will never build another hybrid...a lot of money and you can buy a 450 and mod it out b4 you can match the price of the hybrids...I have some videos of the hybrids on youtube..look up user name TampaBoy813