I cannot seem to find that sweet spot on the 4 wheeler and get it to idol correct, it is either too high, or too low and it stalls, its a brand new carb and it has been professionally cleaned out and i cant seem to get it to want to work, any ideas? am i messing something, or is there an air leak or vaccum leak causing this? need help.

Stu-

 

maby you need a diffrent jet size