Pocket Bikes Mini

How do I convince my parents to help me buy a pocket bike or mini GAS four wheels?

In the past of my parents have said they will wait a little money and different things and also said his trip to nowhere is that (I think the main reason is security) OK! I found new mini GAS four-wheel bikes online and GAS pocket for some $ 250 and under ….. i want to buy one but how I can convince my parents to buy (I'm willing to pay about $ 150 in my pocket)

ask you like you are begging for his life i would opt for a mini pocket quad because the few bikes that I've had the past was very fun for the first few days and then get bored so quick start to do stupid things in them that always ends in an injury if you get a pocket stay with the 50 cc, 50 cc i last time I locked the motor up to trust the oil injection and looked, but what I'm getting is that I took a piston and cylinder 90cc dirt bike and fit it into the 50 cc bike and it was quite a bit fast for you to know I am an adult too, why they have small things like that I like to have toys, besides me, and a few friends used to play on quads small in a small track racing and demolition and such that now we are all working towards establishing ourselves as to race pit bikes in the woods, was riding a KTM 85 a few weeks ago and after strengthened a little, will be great

Pocket bike mini bike