In your “2014 YZ250F Pipe
Shootout,” four of the five mufflers
had carbon fiber end caps (the other
one was magnesium). What does
the end cap do that requires it to be
made out of such high-tech material?
Several years ago the AMA and
FIM banned exhaust systems with
exposed stingers coming out of the
rear of the muffler. Thus, pipes had
to have an end cap covering the
exhaust pipe’s end tube. That is
what an end cap does. Nothing more
and nothing less. However, since the
end cap is the most visible part of
an exhaust system, each aftermarket
manufacturer wanted to make their
system look as trick as possible—
thus the carbon fiber or magnesium
caps. There is also some weight
savings over a stainless, aluminum or
titanium end cap.
GOING AT A SMAIL’S PACE
I was at the Los Angeles Coliseum
on the night that Lance Smail raced
the KTM 540 four-stroke in 1997. Just
like his mechanic said in the July
2014 issue, the crowd did go crazy.
We had never heard anything like
that bike. The sound reverberated and
my eyes were drawn to the sound
wherever Smail was on the track.
It was a night I’ll never forget. But,
there is one thing I should say—one
four-stroke in a field of 19 two-strokes
sounds amazing. Twenty four-strokes?
Not so much.
The best thing about the “Jody’s
Box” column in the August 2014
issue was the photo of his workshop.
I scanned every inch of that photo. I
counted 20 orange MXA helmets on
the top shelf, a couple of Leatt neck
brace boxes in the far right, a shock
linkage on the workbench, and I also
noted that every drawer was meticulously labeled. I was most struck by
what looked like an AMA Pro license
from the 1970s stuck on his toolbox
alongside a 40-year-old CRRC road
race license. Thanks for the glimpse
behind the screen.
Like most motocross racers I am
fanatical about the tires I race with.
My tire of choice has always been the
Bridgestone 403/404 combo. But now,
with the next-generation Dunlop M32/
M52 and Bridgestone X30/X40 tires
on the market, I’m in a quandary.
What should I do?
Given that you prefer 403s and
404s, we surmise that you are in the
market for intermediate-terrain tires.
You are in luck, because MXA is
working on a Dunlop MX32-versus-
Bridgestone X30 shootout for the next
© 2014 K&N Engineering, Inc.
FIND YOURS TODAY:
Cycle Trader.com/Rock River Powersports
Official air and oil filter of:
Washable high-flow cotton
media is designed to increase
horsepower and torque.
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