Took an hour and a half to get the retaining ring off. It had rusted to the top of the fuel pump module. Fuck rust.
So we raced the go karts last night. I stuck the boys in the newer kart with the 4hp/torque converter/suspension vs me in the older 5hp/centri clutch/rigid frame. As I thought the kart with the torque converter will pull away until about 20mph then the older cart with the centri clutch will come flying around it. It seems that 4hp isn't enough to even get to the governor with the torque converter, it just chugs along. Downhill it'll cruise 30mph+ but uphill it'll struggle to get to 20mph, flat ground it's quick to 20, and then slowly will creep to 24ish.