KTM/Husky air filter cage problem.

Related:
Create New Tag

4/1/2018 7:05 PM

Ive got an 18 TC250 and I've noticed when I take the air filter out for cleaning that there is sometimes dirty water marks running downwards from the top right corner, sometimes even a few bits of sand depending on what track I've been at.

So I took the filter off the cage and yeah its what I thought, the top right corner of the cage doesn't contact the air boot base only from half way round to the lower left corner does it contact the base, at the biggest gap it would be around 5 - 6mm, can't get a rule in there to measure it, gotta feel around with my hand to feel the gap. I would post a picture but you can't see anything.

This is why I'm getting water and bits of sand ingress past the grease and seal on the base, anybody have a fix for this?
I was thinking about the Twin Air Power flow cage but I don't wanna spend all that money if its the same.

|

Instagram @_yabba_dabba_dont_


4/1/2018 7:54 PM

how about a bit of filter grease around the edges? No Toil sells a kit with cleaner/oil/grease for cheap usually

|

2002 KX125 (SOLD)/2001 KX250 (SOLD)
1999 KX250 (SOLD)
2016 RM-Z250(SOLD)
2018 KTM 150XC-W(current)

4/1/2018 8:06 PM
Edited Date/Time: 4/1/2018 8:09 PM

Arrowangel wrote:

how about a bit of filter grease around the edges? No Toil sells a kit with cleaner/oil/grease for cheap usually

Yeah like I said in the post its getting past the grease and foam on the base because the cage doesn't sit flat on the base of the air boot. like everybody I use rubber grease around the base of the filter.

|

Instagram @_yabba_dabba_dont_


4/2/2018 8:11 AM

Is the cage or airbox base warped?

|

Take it to the limit, one more time!

4/2/2018 8:13 AM

Also make sure the insert the cage pops into is still in place. That would let it be loose on the seal between the filter and airbox.

|

Take it to the limit, one more time!

4/2/2018 9:07 AM

Stock carb? Ive read where some of the popular Mikuni substitues have longer bodies and as a result were pushing the boot back into the airbox.

|

4/2/2018 9:14 AM

Try out the PC Racing Pro Seal foam seal that attaches to the air box. It's about an 1/8" thick and would make up for any inconsistencies in between the air box and filter cage.

|

4/3/2018 2:22 AM
Edited Date/Time: 4/3/2018 2:40 AM

mx317 wrote:

Also make sure the insert the cage pops into is still in place. That would let it be loose on the seal between the filter and airbox.

No the cage is good, it fits both ways with same issue. The Air boot looks good can't see a warp, don't think the its the airbox/subframe either, I don't think the Carbon Plastic would bend it would just break??

The little rubber doobrey the cage pops into is in the right spot, A friend of mine has a 2018 FC350 he's going to check to see if his has anything similar. Maybe I'll just buy another filter cage see what that unveils...

|

Instagram @_yabba_dabba_dont_


4/3/2018 2:32 AM

MX915 wrote:

Stock carb? Ive read where some of the popular Mikuni substitues have longer bodies and as a result were pushing the boot back into the airbox.

I swapped out the stock Mikuni for a 38mm HV Lectron, I bought the whole kit not just the carby which comes with the shorter reed cage boot, also have a V-Force 4 fitted because stock cage is junk. I haven't measured the overall length from intake trumpet to end of reed cage boot.

Don't know that it being too long is the issue seeing as the issue I have is the mounting hole the cage pops into isn't close enough to the air boot base to seal the filter properly, which would relate to the carby and reed cage boot being shorter and pulling the air boot through the opening it goes through in the air box and it would have to be a lot short to pull it that hard that I would have noticed that when I fitted it.

**FYI the filter seals directly to air boot, not onto the airbox which in turn seals to the air boot**

|

Instagram @_yabba_dabba_dont_


4/3/2018 2:36 AM

exbmxmx wrote:

Try out the PC Racing Pro Seal foam seal that attaches to the air box. It's about an 1/8" thick and would make up for any inconsistencies in between the air box and filter cage.

Going by there website they don't make one for 17/18 KTM/Husky's, and though it would work I'd like to find out why I've got such a big gap, thought maybe somebody with the same bike would chime in if theres is the same or not?

|

Instagram @_yabba_dabba_dont_


4/3/2018 5:54 AM

Is this the bike that was in the trailer fire? (saw your other post). Is it possible things could have gotten a little warped due to the heat or maybe a little damage when tossed around out of the trailer? Just grasping at straws.

|

4/3/2018 6:10 AM

Something else to look for on these models is the center post on the airfilter cage can have burrs that can cut the filter. Just sand down the tip of the center post to prevent this. I have seen more than one like this and my first filter was torn and had to be replaced.

|

Take it to the limit, one more time!

4/3/2018 8:31 AM
Edited Date/Time: 4/3/2018 8:34 AM

exbmxmx wrote:

Try out the PC Racing Pro Seal foam seal that attaches to the air box. It's about an 1/8" thick and would make up for any inconsistencies in between the air box and filter cage.

Slosh 112 wrote:

Going by there website they don't make one for 17/18 KTM/Husky's, and though it would work I'd like to find out why I've got such a big gap, thought maybe somebody with the same bike would chime in if theres is the same or not?

I have one of the PC seals on my 17' 125 and 18' 250sxf. Pretty sure all the big bike air filters and filter cages are the same shape with the main difference being the anti flame screen. RockymountainATV is where I ordered mine.

|

4/3/2018 8:35 AM

the crap filter cage design caused my 16 250sx to blow up at only 25 hours

|

4/3/2018 11:50 AM

If you're concerned, the entire rubber intake boot is easily removed from the "airbox" portion. Could be worth removing, inspecting, cleaning and reinstalling to ensure it's in place securely and aligned. Also worth making sure your quick connector clutches are in good shape.

Once reinstalled or before the above, inspect the OEM cage by mounting it without a filter so you can better see how close to the boot it's mating. Maybe yours is warped or flawed on the upper corner I'd buy another OEM one, or I believe there are some aftermarket options. No-Toil comes to mind.

When I'm installing mine, I really reach up and around the filter to ensure the filter is mating with the boot flange and ensure everything is secured. I also am usually changing filters after every ride... #OCD...oh well.



|

4/3/2018 6:17 PM

MX915 wrote:

Is this the bike that was in the trailer fire? (saw your other post). Is it possible things could have gotten a little warped due to the heat or maybe a little damage when tossed around out of the trailer? Just grasping at straws.

Yep sure is haha. It wouldn't be warped because we got the bikes out before the trailer caught fire, and I don't think that It could be bent as the air box/ subframe is made of that carbon fibre polymer plastic so it would just break if it was hit hard enough, no bending.

|

Instagram @_yabba_dabba_dont_


4/3/2018 6:20 PM

mx317 wrote:

Something else to look for on these models is the center post on the airfilter cage can have burrs that can cut the filter. Just sand down the tip of the center post to prevent this. I have seen more than one like this and my first filter was torn and had to be replaced.

I have heard about that, I haven't noticed it yet with 10 hours on the bike but i only keep my filters for 3 washes and they go in the bin any way so they probably don't have time to tear. I'll do it any way seeing as it could tear while I'm riding I guess, cheers!

|

Instagram @_yabba_dabba_dont_


4/3/2018 6:23 PM

exbmxmx wrote:

I have one of the PC seals on my 17' 125 and 18' 250sxf. Pretty sure all the big bike air filters and filter cages are the same shape with the main difference being the anti flame screen. RockymountainATV is where I ordered mine.

ok ill have a look, I went onto PC Racings website and I couldn't see a listing for the new models. How long do they last?

|

Instagram @_yabba_dabba_dont_


4/3/2018 6:28 PM

alexk417 wrote:

If you're concerned, the entire rubber intake boot is easily removed from the "airbox" portion. Could be worth removing, inspecting, cleaning and reinstalling to ensure it's in place securely and aligned. Also worth making sure your quick connector clutches are in good shape.

Once reinstalled or before the above, inspect the OEM cage by mounting it without a filter so you can better see how close to the boot it's mating. Maybe yours is warped or flawed on the upper corner I'd buy another OEM one, or I believe there are some aftermarket options. No-Toil comes to mind.

When I'm installing mine, I really reach up and around the filter to ensure the filter is mating with the boot flange and ensure everything is secured. I also am usually changing filters after every ride... #OCD...oh well.



Yeah I do the same when fitting the filter thats how I noticed this, plus when I've had muddy water and bits of sand make its way past the seal. I did fit the cage without the filter when I first found this and there is a sizeable gap there in the top right corner.

I've ordered a new OEM cage to see if thats the problem, if it is ill buy a Twin Air billet cage that has no chance of warping.

|

Instagram @_yabba_dabba_dont_


4/4/2018 10:52 AM

mx317 wrote:

Something else to look for on these models is the center post on the airfilter cage can have burrs that can cut the filter. Just sand down the tip of the center post to prevent this. I have seen more than one like this and my first filter was torn and had to be replaced.

Slosh 112 wrote:

I have heard about that, I haven't noticed it yet with 10 hours on the bike but i only keep my filters for 3 washes and they go in the bin any way so they probably don't have time to tear. I'll do it any way seeing as it could tear while I'm riding I guess, cheers!

While installing a filter it can tear it. Easy to check and fix, just smooth it out.

|

Take it to the limit, one more time!

4/4/2018 11:47 PM
Edited Date/Time: 4/4/2018 11:50 PM

exbmxmx wrote:

Try out the PC Racing Pro Seal foam seal that attaches to the air box. It's about an 1/8" thick and would make up for any inconsistencies in between the air box and filter cage.

Slosh 112 wrote:

Going by there website they don't make one for 17/18 KTM/Husky's, and though it would work I'd like to find out why I've got such a big gap, thought maybe somebody with the same bike would chime in if theres is the same or not?

Yes they do I have one on my bike and mine is sealed good before the seal.. I just always put the PC seal on all my bikes

|

4/6/2018 12:51 PM

New filter cage and filter with full rubber bottom like DT1. Seems like a bad cage to me, but the rubber base filters always help (not just the added separate seals).

Could use a 3 layer filter as well, which is a little thicker and will take up more room.

Seems like a uncommon issue though and the Lectron seems to be the stand out mod in my mind...

|

4/7/2018 4:16 AM

joe846 wrote:

New filter cage and filter with full rubber bottom like DT1. Seems like a bad cage to me, but the rubber base filters always help (not just the added separate seals).

Could use a 3 layer filter as well, which is a little thicker and will take up more room.

Seems like a uncommon issue though and the Lectron seems to be the stand out mod in my mind...

Yeah its not the Lectron, boot sits flat in the box. Its the cage, put it on a glass table yesterday and its warped like F%$#K. got a new one on order, if it works Ill buy a billet Twin Air power flow cage.

|

Instagram @_yabba_dabba_dont_