when I bought my sons first bike (agb-21) it was like motoluver said, but worse, nearly 3/4 turn with 1/4 turn of free play in it. So I bought a what was then called a quick action throttle, it is actually 1/8 turn, and he started to control the bike much better. My other sons agb-29 was much better, almost no free play and stock 1/4 turn, after he rode his brothers bike for a few months, it seemed a lot more than 1/4 compared to the 1/8.
Now that I have said all that, Just get the 1/8. You will love it.