ok with all my motor mods i still use stock carb cause there really is no need for me to get a bigger carb other then stock. right now i got a 370 main in there, stock pilot and needle is set on 3rd rib i may move down to the forth. runs good but i feel it is a little on the lean side mid range and top end i feel there should be a little more power im about 300-500 hundred ft above sea level so i might be able to understand the cause of the big jet needed but idk