IMO , the air deleat does nuthing but remove the popping on decell

and it is a 125 turned into a 250 , but it still breaths like a 125 , if u inhibit the air flow at all , aka a better air cleaner ur gunna slow down

when its 40-50 degree's out itll run to 80 indicated (if geared for it) , at 90-100 it struggles around 70 , because it cant breath well because the warmer airs thinner

hmmmm , intercooler ? nitrous "drizzel" ? turbo charger ? :O

I would bet with enough airflow , it would compeat with most 250's out there speed wise