just installed fuel moto 107 kit set pusrods by directions ran good lots of lifter noise called they said turn pushrods 5 more flats. fired it up sounded good lifters quiet took for a test ride runs good uup till about 2500 rpm then starts missing and popping.any body have any suggestions rev it sitting still shoots flame out of exhaust

 

sounds like a busted oil ring...sorry but you are going to have to put another 15 or so hours into rebuilding the motor. j/k sounds like a tuning problem, what is your tuner?

 

PCV have a map from fuel moto, i am guessing the pushrods are off