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Yz125 speed and needle help plz

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i have a 2001 yz125 and i was wandering how fast you think it would top out at and also it keeps fouling plugs and they say i need to adjust the needle so how do i do that?? :thumbsup:

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I just wandered how fast it would go if it is stock cause i can beat a kfx400 and that goes around 80 and i dont think mine will go 80 so ya i was wandering if it was stock or not.

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If it is falling out of an airplane it will eventually hit a top speed of about 120 miles per hour.

If you prefer to be more exact, this formula will help you.

V_t= \sqrt{2mg \over C_d \rho A}

Vt is the terminal velocity,

m is the mass of the falling object,

g is gravitational acceleration,

Cd is the drag coefficient,

ρ is the density of the fluid the object is falling through, and

A is the object's cross-sectional area.

Hope this helps!

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