Had the 2015 Junior EVO out at the track all weekend. Did the break in Saturday and ran it all day today. Here in Denver the altitude plays a big roll in jetting. We’ve been having one hell of a time getting the rpm over 12,200rpm. We’re down to a 120 main jet and 45/45 idle jets. It does produce awesome power from 8-11,000 rpm, but the sub 8,000rpm bog is devastating right now.
We broke it in at a one mile track that is fast. The Junior EVO performed great there, ran the same times as the Senior motor. On the tighter shorter course today we were struggling.