| Tips for containing the spooge - KTM's without o-ring sealed exhaust flanges. |
First off, for all you non-KTM'ers reading this, get'cher mind out of the gutter. We're talking about
that black oily crap that oozes from the cylinder/pipe junction and drips out the back of the silencer
or spark arrestor. Newer KTM's have O-rings on the exhaust flanges, so those of you lucky enough
to have such bikes don't have to go through the annoying rituals described below. These tips apply
to the KTM's that do not have an O-ring exhaust flange. Without the O-ring, the end of the pipe fits
over the exhaust outlet, metal-on-metal, with nothing keeping the black stuff from leaking out.
Also, the pipe fits around an exhaust flange, which is not as effective as having the pipe fit inside an
exhaust flange as with the newer KTM's and most Japanese two-strokes.
Solution #1
Put a layer of red high-temperature silicone on the outside of the exhaust outlet, put the pipe back
on, and let it dry for a day. I would not recommend putting the silicone on the inside of the pipe.
When you push the pipe over the exhaust outlet, the excess silicone gets forced into the pipe,
dries up, breaks off from exhaust pressure, and then gets stuck in the end of your spark arrestor (if
you have a silencer, this is probably not a problem because it would blow out unobstructed). This
method will work until the pipe gets a couple of rubs against rocks or other hard objects, and then
you'll need to re-seal the junction with more silicone.
Important tip: clean both surfaces until they sparkle, then apply the silicone.
Solution #2
Convert your exhaust flange to the 250SX version that has an O-ring. The part numbers are:
547.05.003.000 (exhaust flange)
0770440030 (Viton O-ring for the flange)
Total cost should be about $20.
CAUTION:
I can only guaranty that this will work for the 2002 300 EXC and MXC - for other models, use at your
own risk. Also, the O-ring flange has a smaller inside diameter than the stock flange. This smaller
opening will improve bottom end somewhat, but will take away some top end power and force you to
re-jet.
Spooge out the spark arrestor
No good solution here, but one that helps is replacing the stock spark arrestor with a silencer or an
FMF Turbine Core spark arrestor. I chose the FMF Turbine Core, which is shorter in length than the
stocker, so at least the spooge doesn't drip onto the rear brake.
that black oily crap that oozes from the cylinder/pipe junction and drips out the back of the silencer
or spark arrestor. Newer KTM's have O-rings on the exhaust flanges, so those of you lucky enough
to have such bikes don't have to go through the annoying rituals described below. These tips apply
to the KTM's that do not have an O-ring exhaust flange. Without the O-ring, the end of the pipe fits
over the exhaust outlet, metal-on-metal, with nothing keeping the black stuff from leaking out.
Also, the pipe fits around an exhaust flange, which is not as effective as having the pipe fit inside an
exhaust flange as with the newer KTM's and most Japanese two-strokes.
Solution #1
Put a layer of red high-temperature silicone on the outside of the exhaust outlet, put the pipe back
on, and let it dry for a day. I would not recommend putting the silicone on the inside of the pipe.
When you push the pipe over the exhaust outlet, the excess silicone gets forced into the pipe,
dries up, breaks off from exhaust pressure, and then gets stuck in the end of your spark arrestor (if
you have a silencer, this is probably not a problem because it would blow out unobstructed). This
method will work until the pipe gets a couple of rubs against rocks or other hard objects, and then
you'll need to re-seal the junction with more silicone.
Important tip: clean both surfaces until they sparkle, then apply the silicone.
Solution #2
Convert your exhaust flange to the 250SX version that has an O-ring. The part numbers are:
547.05.003.000 (exhaust flange)
0770440030 (Viton O-ring for the flange)
Total cost should be about $20.
CAUTION:
I can only guaranty that this will work for the 2002 300 EXC and MXC - for other models, use at your
own risk. Also, the O-ring flange has a smaller inside diameter than the stock flange. This smaller
opening will improve bottom end somewhat, but will take away some top end power and force you to
re-jet.
Spooge out the spark arrestor
No good solution here, but one that helps is replacing the stock spark arrestor with a silencer or an
FMF Turbine Core spark arrestor. I chose the FMF Turbine Core, which is shorter in length than the
stocker, so at least the spooge doesn't drip onto the rear brake.
Got Spooge?