I have presser tested my carb and found no leeks will run fine for about 3/4 tank . did the tank , cluch , ect. things and then put on a nova rossi carb nite & day
i have a new carb comming from A MAIN did not find air leek but it has to be the carb
If you have carbon clutch shoes change them to aloy ones, I've had the same problem
