stock TX300 air pressure is 139 psi. It felt like we were
riding on clouds with marshmallow bumps at this pressure.
The rougher the track got, the more we pumped up the
forks. For motocross, we settled on 150 psi. Because of the
offroad damping specs, the forks were still soft on big hits,
but the WP AER forks handled Glen Helen better than any
offroad fork we have ever tested.
The shock had a lot of movement, which is the norm
for an offroad setting. We liked it for high-speed sections
under acceleration, but in turns the rear end would dip
down further than we would have liked. For double duty,
some offroad riding and some motocross, we’d leave it
alone because it is great offroad and passable on a racetrack.
TX300 SETUP SPECS
This is how we set up our 2017 Husky TX300 for
racing. We offer it as a guide to help you find your own
WP AER FORK SETTINGS
These settings are for riders who want to take their
TX300 onto the motocross track and live to tell about
it. The stock 139-psi air pressure works like a dream in
offroad conditions but not on a motocross track. The
first thing you need to do is raise the fork’s air pressure. Most MXA test riders felt that 150 psi was the
sweet spot. Any lower and the big hits blew through
the travel. For hard-core racing we recommend this fork
setup for the 2017 Husqvarna TX300 (stock settings in
Air pressure: 150 psi ( 139 psi)
Compression: 15 clicks out ( 12 clicks out)
Rebound: 6 clicks out ( 12 clicks out)
Fork-leg height: Second line
Notes: Don’t worry about checking the WP AER
forks’ air pressure each and every time you hit the track.
Do, however, bleed both of the air screws on the top of
the forks. Don’t use a #20 Torx to unthread the side’s
bleed screw; it will strip. Use a 10mm T-handle on the
right leg (you have to use a #20 Torx on the damping
leg’s bleed screw).
WP SHOCK SETTINGS
The shock liked to move—maybe too much. And, on
a motocross track, you want a more solid feel. We went
stiffer on compression and rebound to get the results
we were looking for. For hard-core racing we recommend this shock setup for the 2017 Husqvarna TX300
(stock specs are in parentheses).
Spring rate: 42 N/m
Race sag: 105mm (110mm)
Hi-compression: 1-1/2 turns out ( 2 turns out)
Lo-compression: 10 clicks out ( 15 turns out)
Rebound: 8 clicks out ( 15 turns out)
MIKUNI TMX 38MM JETTING SPECS
We had jetting issues that will keep coming back as
we switch from summer temps to cooler winter days.
We thought that the new Mikuni carb was set up rich,
which might be fine when the temperatures drop.
Here’s what we ran in our 38mm TMX (stock settings
Main jet: 420 (430)
Pilot: 35 ( 37. 5)
Needle: 43-73 ( 44-73)
Clip: 2nd (3rd)
Air screw: 2 turns out (1.5 turns out)
Notes: The jetting is rich out of the box. ❏
KTM and Husqvarna switched from Keihin carbs to Mikuni
carbs for 2017. They needed to spend more time in R&D.
The juice for the electric starter is neatly contained in the
confines of the TX300’s battery box.
Q: WHAT DO WE REALLY THINK?
A: The TX300 is a versatile machine. We can’t be
overly critical of a bike that was designed for offroad riding that we tested on motocross tracks. We have nothing
but praise for the Husqvarna TX300. The semi-close-ratio
gearbox, added cubic centimeters, versatile air fork and
accurate handling allow the TX300 to handle the rigors of
motocross quite well. Test riders are always looking for
more power from every bike they test; this is the first bike
they thought was fast enough. More power would only
ruin a powerband that lets you go faster with less stress
on your mind and body. Hardcore motocross racers could
learn a thing or two from this offroad bike.