Frist of all i was stating that i Haven't had any problems with the athena heads I'm running a 4 mill pc crank with a 2 mill Athena 392 big bore kit +5 time 28 mm carbs 30 pilot (yes) ass hole a 420 main fourth clip on needle v3 fmf fattys deleted air box k/n filter 15/41 gear 21/10/9 tires 28/1 and it more like a 430
And hell my friends bike is stock bore cool head 22cc dome v3 27.5 pilot 270 main and t5's15/41 and hie does 90+ ya shit slow don't be mad fuck you troll