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.
More testing next weekend.