Yea I was thinking that too believe me lol. I don’t have a crazy amount of time on it maybe 4-5 hours and I babied it for awhile while I was messing with the jetting. Once I put the 520 in and it rich misfired I figured the 480 should be in the ball park. The 400 main was super lean. Could it be the fact that it’s a newer style tm38 not a zilla carb? It is a genuine mikuni carb as well.  It came with 230 main 22.5 pilot 389 q2 needle jet 4.0 throttle valve and 6fj41 needle. I had to take the slide out of my 90’ zilla carb as the zilla needle did not fit into the slide that came with this carb. Bike idles perfect and runs clean and crisp very good throttle response not fouling plugs still on first one. Running at basically sea level it’s been very hot and humid here mid 80s to 90s. Like I said in earlier post I’m running open custom airbox to twin air foam filter zilla boots tm38 carb v force 3 reeds dynoport mx/trail port along with their pipe/silencer, coolhead with 22cc dome, wiseco 68.25 piston. 25 pilot with air screw at 1 turn out will have to double check that. 480 main 389 q8 needle jet stock 88+ zilla needle on middle clip stock 90’ throttle valve/ slide which has no major wear in good shape. 93 octane with maxima synthetic oil. Sorry if I’m being repetitive and excessively long with the posts.