so rev it to its potential = if your going to run 7ooo rpm, then tune it from top of stall
buzz it to 7k rpm kill ignition at flat 7 k read your plugs . more air + more fuel = chit if it cant expel the combustion a lean 650 will blow the fat 750 if it cant burn the fuel
and get it out out quick enough to reload the cylinders . A dyno read on an engine can be way different than a read at the end of your exhaust system at wheels. air and gas =
what the flow will handle not just the engine . just my1 cent worth
