Well, the warrior head is a stuffed up 2 valve that only builds 17 horses stock and if you modify it to the hilt, 35hp is about all the head design will produce, so im using the xt because its a 4valve, and from factory its about 27 hp.
Im hoping to have it finished before March because thats when the mx series starts. I have a regular warrior motor I built in case the xt hybrid didn't work out. So its a spare motor at the moment. But in the little info I can find about people modifying these most complain about small valves so thats why I asked about the oversize valves. The head will be ported regardless, so I guess that if f there's no alternative valve options I use the STD valves.