Rubber baby buggy bumpers. Say that
six times as fast as you can.
IS THAT CHATTER OR
My 2014 KTM 450SXF makes
a funny noise when I engage the
clutch. It runs fine, and the clutch
has worked perfectly for two years
with absolutely nothing more than
oil changes, but the noise bothers
me. What could it be?
The KTM 450SXF and 250SX
two-stroke come with diaphragm
clutches that are operated via a
Belleville washer instead of separate coil clutch springs. Thanks to
its creative design, steel basket and
hydraulic actuation, it is the most
durable motocross clutch ever made.
But, that doesn’t mean that you can
Work smarter, not harder.
THOSE PESKY HUSQVARNA SEAT BOLTS
I don’t consider myself to be a large man, but I must have giant hands,
because when I try to remove the seat bolts from my Husqvarna FC450, I
can’t reach them, not even with my pinky finger. Is there a trick that I don’t
No. Since Husqvarna’s engineers tucked the seat bolts into the hand holds
on the sides of the bike, they are sealed up tighter than King Tut’s tomb. On
a side note, KTM will go to the same basic setup on its 2016 models. The
simplest solution is to get a magnetic pickup tool (about $6 at an auto parts
store) and use it to fish the seat bolts out of the cavity. People with smaller
hands can reach it with the pinky fingers of both hands and flick the bolts
out. But, the MXA wrecking crew makes a double loop of safety wire. We
put the small loop over the threaded portion of the seat bolts and let the
large loop extend back into the hand-hold cavity. Then, when we loosen the
seat bolts, we remove them by tugging on the wire.
Believe it or not, your KTM 300XC uses
a 10-amp fuse.
WHY DID MY ELECTRIC
After a crash, the electric starter
on my KTM 300XC two-stroke quit
working. I checked the button, and
it wasn’t damaged in the crash. Why
won’t my electric starter work?
The answer is simple. When you
crashed, your knee or the dirt hit the
electric start button while the engine
was still running. This spiked the
electrical system and burned out the
10-amp fuse in the airbox. Replace
the fuse. You can get one at any
auto parts store, and, in fact, KTM
provides a spare fuse inside the
ignore it for the rest of your life.
KTM equips its diaphragm clutches with rubber dampers. These six
rubber bumpers give the KTM a
“cush hub” that takes lash out of
the system when you engage the
clutch, especially when slamming
it from gear to gear. But, like all
things made out of rubber, they do
wear out. Given that your bike is
over two years old, we would guess
that it is time to replace the six
rubber dampers. It is a simple job,
and the six new dampers will cost
you around $20. Step one is to drain
the oil and lay the bike on its side
while you remove the clutch cover.
Since the rubber bumpers are housed
inside the inner hub, you will need to
remove the pressure plate, Belleville
washer and clutch plates to get to
the inner hub. A hub holder comes
in handy at this point. Once you get
there, all you have to do is fish out
the six worn-out bumpers, replace
them with six new bumpers (KTM
part number 78132025100) and bolt
it all back together. If you are careful
with the tab washer, you can reuse it
to lock the clutch nut back in place.
It wouldn’t hurt to order a new one
while you are ordering the rubber
bumpers; it is cheap insurance. MXA
changes its rubber bumpers once a
year or when the clatter bothers us.