go to a local dirt bike shop and explain the problem to them dirt bike stores always have mechanics to help
Most likely you're thinking of the jets in the dirt bike's carburetor.
Buy a USED 250 dirt bike.
it hooks on to the engine block and atteaches to the gas line
That depends on what you are using it for. Obviously, if you are dirt biking, you should use a dirt bike, and otherwise use a street bike. Start out with what you are going to use the most - dirt (freestyle) or street racing.
poket bikes are gay. go with the dirt Dirt bike, definitely!
Not enough air in the mix.
Snowboard because its better than a dirt bike.
Yeah if they have the right size dirt bike and gear
fast enough
I'm assuming its a 2-strike. Look under the bike, where the fuel cable connects to the carburetor; you should have a gold plated screw, or a large screw of different color that should be connecting the two. Simply cut/saw the screw off and you're good to go, bike should start fine.
the carburetor might be clogged or the carbs throttle slide might be stuck
It depends what type of adjustment you are trying to make but you should refer to the manual if you have one. If not then ask someone at a shop to help you. For most tuning though there are little screws you can twist both on the carburetor itself and on the tubes leading into and out of it.