Originally Posted by
jnitro
Installed a 3 needle the O.S. 12180 21J Carburetor today and ran 1/2 gallon on my GXII...Not knocking the 2 needle carb in anyway but the 21J carb makes the motor that much more better. I found the transition from low to high much more smoother. Can't wait to try go's 3 needle carb.
yes... the OS and nova carbs will give you a significant boost in both mileage, performance, and tunability... as will the arrow/go 3-needle.