I was wondering wut motor should i put in my bike iam getting ready to race it and i also want it to work good in the sand dunes.I was either thinking of putting a YZ426 motor or a CR250 in it will this work and wut do i need to make this work ???????

 

Edge,
i went through the same thing and i found a 1979 TT500 motorcycle engine that was a fairly simple conversion. It was an old ice racing bike, with a modified motor. makes about 45-50 hp. I've seen warriors with a 426 in Dirtwheels and that appears pretty good, probably more reliable than mine. good luck