hey, i am 15 years old, and i am gonna buy a 2004 YFZ450 and i would like to know what you people think the best mods for it are.
i am already gonna buy a HMF full exaust system, nerf bars, jet the carb, k&N air filter.

what are some more mods. i also wanna mess with the gearing. i don't know which way to go with the sprockets for more speed(how many teeth for each sprocket)

 

ware are you riding and what kinda terrain is it ?

 

larger front smaller back = more speed
smaller front and larger back = more torque but slower