Drilling holes in your air box will increase the amount of air reaching the carburetor. This will lean out the fuel mixture. The carburetor will need to be rejetted richer (larger main jet) or richer main needle position to optimize the fuel mixture.
> > Try removing the restrictor sleeve at the pipe. I also
> had the same problem with my wife's atlantis when I drilled
> a hole on the airbox. But after removing the sleeves it
> gave 8-10 MPH more.
> More air coming in and less air coming out.
>
> > I have a 2004 derbi atlantis. I drilled holes in the air
> > box and when i hit about 30 mph it hesitates very badley.
> I
> > have to let completley off the gas. woundering if it was
> a
> > restriction
> > plate. If it is were exactly is it?
>
>