side panel and then drilled a 1-inch hole in the side panel
so that it lined up perfectly. We only drilled one hole, but
if we had cut more of the airbox structure away, we would
have added more holes.
On the left-side panel, we followed Rockstar’s advice and
drilled six 1-inch holes in the panel in a triangle shape,
behind where the air filter was located. Do not drill holes
directly in line with the air filter. They work best when they
are behind the air filter. Use our photos as a guide.
HUSKY MAKE YOUR
RUN LIKE A KTM
THE ICE CREAM CONES
Five years ago KTM put ice-cream-cone restrictors into
its mufflers on the 2013 models. KTM dropped them for
2014, so we were surprised when they were revived on the
Husqvarna FC350 and FC450. The FC250 does not get any
restrictors in its muffler. Since the straight-through FC250
muffler is identical in length, shape and core size to the
FC350 and FC450 mufflers, we replaced our FC350 muffler
with the FC250 muffler.
It should be noted that we could have used any aftermarket slip-on muffler from DR.D, Pro Circuit or FMF, but
we had an FC250 muffler sitting on the workbench and
felt that it would allow for a better cross comparison to the
stock FC350 muffler.
CHANGE THE GEARING
The only MXA test riders who like the stock KTM
350SXF and Husqvarna FC350 gearing are our former AMA
National Pros. The Vet and Novice test riders prefer to gear
their 350s down. For most tracks, they add one tooth to
the rear sprocket, and, for tighter tracks or slower riders,
they add two teeth. It should be noted that one of the main
goals of gearing the 350s down is to be able to get the
engine to 13,400 rpm as quickly as possible. Peak power
is at 13,400, and if you don’t get there, you won’t get all
the horsepower that the FC350 and 350SXF have to offer.
AIR FILTER CAGE
The MXA test riders remove the mesh backfire screen
from the air filter cage. The easy way to do this is to order
a Husqvarna TC250 two-stroke air filter cage, because it
does not have a backfire screen in it. We suggest switching to a fire-retardant Twin Air filter just to be safe. The
reward is improved throttle response.
WHAT DID WE THINK?
Although throttle response is not always noticeable on
a dyno, we were able to see a 1-horsepower gain across
the board. Additionally, on the race track, our modded
Husqvarna was snappier, more responsive, quicker-revving
and racier. Job well done. ❏