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Over a decade ago the Pro Street
class was run almost exclusively
by Hayabusas. The class needed
some diversity and class rules
for the Liter bikes were opened
up to try and encourage Liter
bikes to join the party. This
gave the Liter bikes basically a
blank canvas to do what they
wanted to build a competitive
machine for the class. The rules
for the Hayabusas still remained
heavily restricted though.
Back then, the rules allowed the
Liter bikes to run any fuel they
wanted while the Hayabusas could
not, the Liter bikes could run
3-4” longer wheelbase than
Hayabusas, the Liter bikes could
bore and stroke their engine to
any size motor, the liter bikes
could run over 100 lbs. lighter
than a Hayabusa, the Liter bikes
were 2” ground clearance and the
Hayabusas had to be 3” ground
clearance, the Liter bikes were
at 20” seat height and the
Hayabusas were at 22” seat
height, the Liter bikes could
run autos that the Hayabusa were
not allowed to run, and the
Liter bikes could run Nitrous
and a Turbo where the Hayabusa
could not.
Once a few teams spent time and
energy on the Liter bike
program, they became a force to
reckon with. Then eventually
they had a dominant advantage
because the Hayabusas were
handcuffed to rules and the
Liter bikes were not.
In 2019 the Liter bikes lost an
inch and we added a little
weight to help close the 100+
weight gap between the Liter
Bikes and the Hayabusas, and we
capped the Liter bike
displacement at 1125cc. This
year we have seen that did
nothing to help achieve the
parity the class needs with the
heavily restricted Hayabusa
combos.
So, we have made a few more rule
revisions effective for the last
XDA race on Sept 18-20 that
teams can get changed over the
next 2 weeks at their shop
before the last XDA event. The
Liter bikes will lose 1” of
wheelbase for the last event. We
have also deducted 25 lbs. from
the Hayabusas along with giving
2 more inches of wheelbase to
the Hayabusas and allow them to
run the same auto transmission
as the Liter bikes.
We are hoping that this change
will attempt to help close the
rules gap and bring these combos
closer together in performance.
Currently the Liter bikes and
Hayabusas are now all limited to
the same fuel, the Liter bikes
and Hayabusas are allowed to the
run the same auto transmission
options, but the Liter bikes are
still 2” longer than the same
weight rider on a Hayabusa, the
Liter bikes are still 75 lbs.
lighter than Hayabusas, the
Liter bikes are still 1” lower
ground clearance and 2” lower
seat height.
The new PST revisions for XDA on
Sept 18-20 will help close the
gap in the class for better side
by side racing, but there is
still more work to do on the
rules this winter when teams
will have the time at their
shops to make the changes that
are needed to achieve parity in
the class for 2021. Next year
all Turbo Liter bikes and Turbo
Hayabusas will have the same
ground clearance and same seat
height rule. There could be some
other changes, but we need to
see how things pan out for the
rest of the season before
committing to any other changes.
To view the current
PST Rule Revisions, click here:
https://xdaracing.com/rulebook/2020/prostreet.pdf
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