We start with a brand new Walbro WT1048 carb that was designed to work with our style Marine RC engines. We completely disassemble the carb and inspect all parts. We modify the ventury on the main body with a large Bellmouth done correctly so that it not only straightens the air going into the carb it gives the carb a stronger signal for better fuel distribution. We put a certain grain pattern on the ventury that helps eliminate the boundary layer of fuel and oil that form under high speed airflow at high RPM.
You can also add any of the listed options you want to fit your needs.
We have been modifying Walbro carbs since 1996 before most of my competitors where even in business, so don't be fooled by claims of modified carbs that are done on a machine that have stepped angles or too small of a bellmouth to work correctly. Get one that has proven itself in numerous national event wins and world records that are known to respond from a dead crawl idle to wide open throttle in an instant.