WHAT IS IT? This KTM 125SX pipe was developed by
Bud Racing and made by the Netherlands-based company HGS. As for the carbon fiber silencer, Bud Racing
made and developed this work of art in-house in France.
WHAT’S IT COST? $229.00 (pipe), $119.00 (carbon fiber
CONTACT? www.budracing-usa.com or (951) 245-2660.
WHAT STANDS OUT? Here’s a list of things that
stand out with the Bud Racing 2016 KTM 125SX pipe
(1) Installation. With the Bud Racing KTM 125SX
pipe and silencer, all the OEM hardware is transferred
over. Before installing the pipe, make sure to take the
O-rings out of the OEM pipe and insert them into the
Bud Racing pipe. Do not race without them. Installing
the pipe was a breeze, but be sure to use anti-seize on
the stinger/silencer juncture. We failed to do this during
the first test run and struggled to separate the two parts.
Overall, the Bud Racing pipe was a five-star fit. As for
the sleek carbon fiber silencer, it has one P-clamp-style
bracket that slides on the carbon fiber tube to line up
with the stock KTM fitting. It was a simple adjustment,
which isn’t always true with P-clamps. Keep in mind
that the stock KTM silencer has two mounting brackets,
whereas the Bud Racing silencer only has one. We put
the unused bolt back into the empty fitting so as not
to lose it. Plus, we always switch back and forth between
test pipes and stock pipes several times with each test
rider to provide point/counter-point.
( 2) Stock trim. The 2016 KTM 125SX is all new from
the ground up. It is leaner and faster all the way through
the powerband compared to the 2015 model. On the
dyno, the stock KTM 125SX is the fastest production 125
to date. We like the smooth roll of the 125SX’s linear
powerband, but ultimately we would like to liven up the
mid and add some over-rev on top.
( 3) Performance. The Bud Racing pipe and silencer
are built for racers, not the average Joe out for a play
ride. Bud Racing focused its attention from the middle to
the top. The stock KTM pipe had better pickup off the
bottom and ran cleaner than the Bud pipe. Every MXA
test rider felt that the Bud pipe didn’t run as clean in
the lower revs, when the 125SX was being transitioned
through tight corners or off-cambers at half throttle.
However, once out of the bottom-to-mid section, the Bud
Racing pipe livened up the engine where we wanted it
most. Not only did it have a more aggressive hit, but it
had a secondary jolt on top that kicked in like an after-
burner where the stocker signed off. Best of all, the Bud
pipe moved max horsepower up 500 rpm from its 11,400
peak. This made it easier to stay in the sweet spot from
shift to shift.
( 4) Tuning. Race gas? No need! Jetting? The KTM
125SX ran on the lean side with the Bud Racing pipe.
We played with the air screw and got it in the ballpark.
You can also go up one on the main jet if you want to
be on the safe side.
( 5) Options. Bud Racing also offers an aluminum
silencer with a carbon tip at the same price. We suggest
this silencer if you are looking for increased longevity.
We have not had any issues with the Bud Racing
full-carbon silencer, but our past experiences have taught
us that carbon fiber silencers get soft and fail as they go
through continuous heat cycles.
WHAT’S THE SQUAWK? We have two quibbles. (1)
Bud Racing does not include replacement O-rings with
the pipe. This is not an issue unless the OEM O-rings are
damaged. ( 2) We wish the roll-on power was better, but
you gotta give to get—and we got added power where
125’s are designed to run..
This is a good pipe and silencer for a bike that
already makes the most horsepower of
any 125 two-stroke.
BUD RACING 2016 KTM 125SX PIPE & SILENCER
MXA TEAM TESTED