How good is the CV carburetor?
Jerry Branch of Branch Flowmetrics did dyno testing of a CV carburetor
against the Mikuni HSR-42. The results of this testing is shown below. The
engine was a stock bike with a set of Branch #4 heads installed. Everything else
on the bike was stock. The results show that a properly tuned CV carburetor
makes excellent power on mildly modified engines. Considering that Branch
Flowmetrics is owned by Mikuni (now), the dyno testing shows how good a CV can
The results of an S&S carburetor would be similar to the Mikuni results.
This dyno chart should convince any rider that for Stage 1 and 2 engines the
OEM CV carburetor is the best bang for the buck.