bigbore420

What big bore kit uses cr 125 reeds

i got the banshee as a basket case the guy had a blueprint of the motor at 420 big bore with .120 over bore wesico pistons welded stroker crank v force delta carbon fiber reed valves from a cr 125 36mm mikuni carbs reamed to 37mm wich are mitch matched which is why i was gonna run it with stock carbs for now. so i was wondering what i really have the jugs have pp etched into both jugs.

I have a 91 Yamaha Banshee with a 420 stroker motor can i run it with stock carbs until i get different ones and what would the fuel to mix ratio be