F fasttommy Member Mar 25, 2021 #1 2.815 mod methanol motor biuld which is better choice a mikuni or gx390 set up.
I IndyHarry Member Mar 25, 2021 #2 Mikuni. A bored GX390 carb is only 24mm if I remember right. You can get a Mikuni a mm or two smaller than your intake valve for optimum performance.
Mikuni. A bored GX390 carb is only 24mm if I remember right. You can get a Mikuni a mm or two smaller than your intake valve for optimum performance.
