Jett Lawrence set a blistering time to take top spot half a second ahead of defending champ, Chase Sexton.
Cooper Webb and Eli Tomac were third and fourth fastest.
RJ Hampshire topped the 250 West division.
Smith was second behind Hampshire with Shimoda third fastest.
Levi Kitchen was fourth fastest on his Pro Circuit Kawasaki.
450SX:
250SX:
Image: Feld Entertainment Inc
