QT50: A Fish Story Ok, we had the cylinder bored out a little. 35 mph by bumping the jet from 65 to 75 With Bi Turbo, we are just under 40 now. Back to a 65 jet and now doing 37 mph. From 37 to 46 with just a YT60 jug after ditching a bored out stock jug? Gutted stock exhaust. Up to 53 mph but no details April 23, 2007 – claiming 53 mph with these mods but stock carb. I’m not buying it. Now we are up to 57.5mph and really no change in performance parts from last time. I’m going to have to call a big bullshit on this. He’s lucky to do 45-47 with stock carb.