Nicoll Racings carb mods are Dyno tested and track proven to increase throttle response and in most cases horse power. 

We have proven that you can make the '06 CRF 250 carb work amazing (i.e. no-bog) with improved throttle response and more horse power than going back to the '05 carb.

Also, our carburetor modification costs less then buying a new one! Carburetor modifications cost $179.00 and is one of the biggest improvements you can make.