Suzuki

My friend started riding a gz250 2 years ago and loves the bike and cant afford to upgrade anyway. i am looking for any ways to get more speed and power out of this little bike without spending a fortune. i have ordered sprokets, one tooth bigger front and 1 smaller for the rear. any other ideas out there?

If the bike is already capable of your countries maximum speed limit, further modification for increased speed is unnecessary and potentially illegal if used on public roads.