Help Please

[04exking]

I need to do a science fair project for my school and I want to do something with my 400ex so I need some ideas. Please help me because it is do in a month and a half.

[esr250r86]

Do it on the differences between 20 and 18 inch tires compared to 22 and 20 inch tires.

[04exking]

I need something that sounds a little more complicated plus that one is too easy to figure out. Thanks for the help though.

[04exking]

bump

[firefighterjosh]

How to jet?

How a carb works?

the diffrence between 2 stroke and 4 stroke?