hey rogue i took my stock kx 500 39mm carb off and tested it on my zilla and it runs good and dont cut out but its like i put a restrictor on my power it just dont have the 2 stroke rev not enough flow and fuel like the lectron does i mean it runs killer on the kx500 that sob is a beast it will kill my zilla with all my mods i have done to it and the kx has a fmf pipe and silencer but its hard to beat the old kx its a monster its a 2000 if i could i would put that motor in the zilla would be awesome cause the kx has never let me down ever same plug in it since forever and it starts right up and goes all day this zilla with all the money dumped into it im getting pissed off more and more that it cant hold its own im close i think but who knows