Post by: dallas.koncir on July 09, 2013, 03:23:15 AM
Has anyone else had any issues like this?
Post by: Dirt Addict on July 09, 2013, 04:49:43 AM
sorry, just joking. Check your airbox seals and carb to boot alignment.
Post by: team499 on July 09, 2013, 05:17:06 AM
Post by: Stusmoke on July 09, 2013, 09:07:24 AM
I have a 2012 250SX and am having some issues with the top end. Basically they have only been lasting me 5 hours or so. I am on my 4th top end now. After the 2nd time it went, I switched to the 300 kit but still getting the same results. I have noticed that pretty much every time I change my air filter I have a noticeable amount of dirt in the air box. The main tracks I ride on are sand but I take 4 air filters to the track with me and change after almost every moto, which I have never had to do on any other bike (I rode CRF450s for about 4 years before I switched). I even switched to a Loudmouth air intake but still get dirt in the air box. I love the bike but the lack of reliability has me at the end of the line with it. I shouldn't have had to spend the amount of money that I have on this bike for the amount of riding I have done.
Has anyone else had any issues like this?
First off, welcoem to the forum! Secondly, I completely understand how frsutrated you must be and you're completely right, this is ridiculous, but stick with the smart dudes on here, me not included, and it'll get fixed.
What was the reason for swapping out a piston at 5 hours? You should get ten times that out of a well tuned 250. Have you got pictures of the old pistons? Also if you could post up a picture of your sparkplug's action end, that would speed the process too. AS for the dirt in the airboot, is the 2012 250sx equipped with the no tools air box cover? Pretty sure it was introduced in 2011. Make sure that is properly clipped in because I've found that mine (2013 250SX) can look and feel like its clipped in but the bottom clip is off. Also, have you changed the jetting? Have you noticed any odd noises coming from the motor?
Again, bear with it and it'll get solved one way or another. The air boot problem and piston problem are possibly two separate problems.
Post by: TotalNZ on July 09, 2013, 09:32:57 AM
As has been mentioned make sure you run your finger around the edge of the filter to make sure it's seated right, i'm guessing thats your problem. Also check where the boot meets the air box and silicone it to make sure.
Post by: dallas.koncir on July 09, 2013, 02:31:38 PM
If there's dirt on the inside of the filter then thats definitely your problem and you'll keep chewing through top ends untill you find where it's coming from.
As has been mentioned make sure you run your finger around the edge of the filter to make sure it's seated right, i'm guessing thats your problem. Also check where the boot meets the air box and silicone it to make sure.
I have a Loudmouth intake, it is pretty hard to mess up installing those air filters. When I did use the stock cage, I only had a problem once with the filter not being seated right, after that I triple checked every time I changed filters.
First off, welcoem to the forum! Secondly, I completely understand how frsutrated you must be and you're completely right, this is ridiculous, but stick with the smart dudes on here, me not included, and it'll get fixed.
What was the reason for swapping out a piston at 5 hours? You should get ten times that out of a well tuned 250. Have you got pictures of the old pistons? Also if you could post up a picture of your sparkplug's action end, that would speed the process too. AS for the dirt in the airboot, is the 2012 250sx equipped with the no tools air box cover? Pretty sure it was introduced in 2011. Make sure that is properly clipped in because I've found that mine (2013 250SX) can look and feel like its clipped in but the bottom clip is off. Also, have you changed the jetting? Have you noticed any odd noises coming from the motor?
Again, bear with it and it'll get solved one way or another. The air boot problem and piston problem are possibly two separate problems.
Thanks, at 5 hours I had no compression and the bike wouldn't even start, so I did the top end. I could get pictures of my old pistons I have one from the 250 and one from the 300 kit. I haven't changed the jetting and I haven't noticed any odd noises from the motor.
Post by: SachsGS on July 09, 2013, 03:31:27 PM
Post by: mj4trax on July 09, 2013, 04:15:48 PM
Not to insult, but are you oiling your air filters? (I have a couple buddy's who didn't realize this was necessary... I don't recommend buying their used stuff). If so, what oil are you using and are you using enough?
2nd, what kind of oil are you running in your fuel.... and at what ratio?
Pictures of the worn out parts will help a lot too, but I'm not the first to point that out.
Post by: dallas.koncir on July 09, 2013, 05:14:15 PM
Post by: TotalNZ on July 09, 2013, 06:50:24 PM
Post by: rlaj1004 on July 09, 2013, 07:46:33 PM
Post by: dallas.koncir on July 09, 2013, 07:58:31 PM
https://dl.dropboxusercontent.com/u/72322384/piston-1.jpg
https://dl.dropboxusercontent.com/u/72322384/piston-2.jpg
https://dl.dropboxusercontent.com/u/72322384/piston-3.jpg
https://dl.dropboxusercontent.com/u/72322384/spark-plug.jpg
Post by: Stusmoke on July 10, 2013, 11:46:12 AM
The dirt you say is on the carby side of the filter is definitely whats causing your issues, i have absolutely no doubt of that. You just need to find out where its coming from.
x2 If theres dirt on the carby side, thats your issue. I thought you mean't on the air filter side, my bad. After looking at those pics, definitely looks like debris to me. Which is sort of good, cos it means you don't have two separate issues. Try using the stock KTM intake. Never heard of loudmouth though. Spark plug looks ok, hard to see.
You're sure theres no damage to the exposed area of the airboot? If you're oiling and properly sealing your filters, you shouldn't be getting debris. Are all the screws on the carby still in there? Don't laugh, I lost my air screw on my old honda CR125. I was wondering why its idle was all weird
I am oiling my filters, I have been using No Toil and I would say that I use enough. I use Amsoil synthetic 2 stroke oil in my fuel and mix at 60:1.
60:1 is KTMs recommended mix, nothing wrong there.
Post by: evo550 on July 10, 2013, 01:05:30 PM
I've just invested in some Funnel web filters and hopefully they do a better job......any way enough about me, you can try a new filter, and check the seal between the carb boot and the air box, if you ride in deep or fine sand I would also recommend a filter sock (pantyhose are cheap and easy).
That first piston looks like the skirt is about to drop off, your cylinder could be badly worn.
Post by: WINDSURF on November 08, 2013, 02:52:58 PM
Using the loudmouth air intake system eliminates the intake problems on the questionable KTM filter seating correctly.I run the Loudmouth system on all my rental machines here in the northwest.After ruining several engines in dusty conditions,I found even if the filter is seated correctly,the rim grease dries out quickly,cracking,and allows dust particles to enter the intake.BELIEVE ME,the new filter clamp does the job.I also run PC filterskins to lengthen the life of the $30 dollar filter.I find no loss of power,and no noticeable increase either.you can find more info at oregonmotorcyclerental.com
Post by: metal_miracle on November 08, 2013, 07:32:08 PM
a tip ktm filters are square so you can rotate them wrong and get a exposed gap.
only seen a trace of sand when it was really wet at the track
Post by: diogo.mauro.1 on November 10, 2013, 12:22:47 AM
Post by: Stusmoke on November 10, 2013, 12:27:17 AM
OREGONMOTORCYCLERENTAL.COM
Using the loudmouth air intake system eliminates the intake problems on the questionable KTM filter seating correctly.I run the Loudmouth system on all my rental machines here in the northwest.After ruining several engines in dusty conditions,I found even if the filter is seated correctly,the rim grease dries out quickly,cracking,and allows dust particles to enter the intake.BELIEVE ME,the new filter clamp does the job.I also run PC filterskins to lengthen the life of the $30 dollar filter.I find no loss of power,and no noticeable increase either.you can find more info at oregonmotorcyclerental.com
Nonsense. Oil your filters, run your fingers around the edge to make sure it is seated correctly. If you do it right, and its really not a complex thing, there shouldn't be any issues to be found unless theres actual damage somewhere.
Post by: gpnewhouse7 on November 10, 2013, 12:47:33 AM
Actually been wondering how hard it would be to put a KTM rear end on my CR5. It seems like a pain in the ass now having to remove the seat all the time just to change the air filter.
Post by: Stusmoke on November 10, 2013, 01:06:29 AM
Of the four KTM's I have owned I've never once had a problem getting the air filter seated properly. Although I have seen a freshly rebuilt sx150 engine get destroyed within 3 hours of riding because he didn't put the filter on properly, so I guess you could put them on wrong but if you take care when refitting the filter you should be fine.
Actually been wondering how hard it would be to put a KTM rear end on my CR5. It seems like a pain in the ass now having to remove the seat all the time just to change the air filter.
Nothing like as much of a pain in the arse as jerry rigging the KTM rear end to the CR500 would be, put it that way
You'll get used to the seat thing, and its nothing compared to changing the air filter on a 10-13 YZ450F. That was absolutely ridiculous.
Post by: gpnewhouse7 on November 10, 2013, 01:12:56 AM
Of the four KTM's I have owned I've never once had a problem getting the air filter seated properly. Although I have seen a freshly rebuilt sx150 engine get destroyed within 3 hours of riding because he didn't put the filter on properly, so I guess you could put them on wrong but if you take care when refitting the filter you should be fine.
Actually been wondering how hard it would be to put a KTM rear end on my CR5. It seems like a pain in the ass now having to remove the seat all the time just to change the air filter.
Nothing like as much of a pain in the arse as jerry rigging the KTM rear end to the CR500 would be, put it that way
Ye I figured it would be pretty difficult but I doubt I'll be selling it so I'd like to try and get everything perfect on it, besides apart from the subframe I already have most of the parts that would be needed lying around the garage.
I have seen a service honda airbox with a door on the side but that was an 09-12 rear end and to be honest it kinda crap in comparison to the KTM setup.
Post by: evo550 on November 10, 2013, 06:52:55 AM
I use funnel web filters that incorporate a triple lipped neoprene rubber sealing surface instead of just standard foam.