INSTALL A PUMPER CARB
Where to get help:
FourStrokeWorks - Jerry can get you all the jets, needles and parts for the FCR's. He also has offers serveral services that you should look into.
Sudco - Carrys all kinds of adapters for your FCR Carb and more.
A popular way to "hopup" the KLX is to replace the stock CVK carburetor with a decent pumper carb. The 33mm Mikuni pumper carb is perfect for the 250, but if you ride a KLX-300, consider the 36mm Mikuni. Click and enjoy the expertise of those KLXers who have already taken the plunge and left a track of their experience for the rest of us...