Note:
All dyno tests were performed on a SUPERFLOW dyno. These
results are not directly comparable to a DynoJet dyno, which tends
to yield higher numbers than the Superflow dyno.
The first modification to the bike was the addition of Yoshimura
RS-3 Stainless cans. These cans are very nicely made, and have
a wonderful sound, and are not excessively loud.
The second modification was the carb jetting. The DynoJet kit recommends
different combinations of jet sizes (front and rear cylinders) whether one has
the stock pipes, a "quality aftermarket exhaust," or the aftermarket exhaust
with a K&N air filter. In this work, the DynoJet recommended jets
for the stock bike were installed (even though the Yosh cans are
installed). This was done to provide improved performance and
driveability in the environmental conditions of the Monterey peninsula
in California.
As can be seen from the dyno chart linked below, the jetting
provided markedly increased power and torque below 5000 rpm, with
mild to no increase above 5000 rpm.
The obvious question is whether going up one size in jetting
will improve the performance above 5000 rpm without sacrificing
performance below 5000 rpm and overall driveability. This will
be the next undertaking.
Here is the dyno chart with all three pairs of curves together,
stock bike, Yosh cans only, Yosh cans with jetting.
In addition to the exhaust and jet work, the Superhawk has
RaceTech gold valves and fork springs, and Galfer stainless steel
brake lines in the front. All superfluous fuel/air/water systems
have been removed.
The bike drives wonderfully, and the increased performance
has transformed the bike.
