KTM 530 EXCR- More better!

Discussion in 'Thumpers' started by neduro, Apr 3, 2008.

  1. GreatWhiteHunter

    GreatWhiteHunter Lovin' Life!

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    Just wanted to drop a note and say thanks to everyone that posted in this thread. I've absorbed it all (or like to think I have) and now I get the chance to put it all together. I picked up a 2010 530 XC-W with a street title and will be using the downtime this winter to make a few mods to the bike. The pointers in this thread will go to very good use.

    Here's a pic, hope you don't mind that it's not an EXC.

    [​IMG]
  2. Foot dragger

    Foot dragger singletracker

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    Nice! I like the 6 days graphics,very stylish. I had my 530 out today,springlike conditions with enough mud and rocks to keep it interesting. Traction was mostly great and had a blast!
  3. Hayduke

    Hayduke ///SAFETY THIRD/// Super Moderator

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    More bonding time with the 530 today. :D

    [​IMG]
  4. B-Rod

    B-Rod RubberNecker

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    Way to rub salt in a wound. You wait duke, once I put this prickly pear on, I'll be bonding with my 530 as well. I'm jacked, and am very curious how it is on ice, since it seems to have more pull than my friend's 530, and much more than the 525.

    [​IMG]
  5. Foot dragger

    Foot dragger singletracker

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    Ive gone riding in Colorado a few times,none of it looked like Mr Hayduke's version of Paradise,Makes me want to go to Salida and check it out!
    Singletrack is epic at this moment in time in Nor Cal though,snow at 6500 ft but everything below that is absolutely perfect! Local secret trail area is all decomposed granite,velcro traction for sure.
  6. Yellow Pig

    Yellow Pig Allergic to Asphalt!

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    So my 2010 XC-W started using quite a bit of oil at 100 hrs/2400miles. Should I just put in new KTM rings or go for an aftermarket piston and better rings?

    What do you guys recommend?

    Thanks
  7. B-Rod

    B-Rod RubberNecker

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    Consider doing a leak down test on it before you go crazy. This will indicate where your problem is. There is still a possibility of a guide seal lifting. Somewhere not far back, Ned mentioned one of his Dakar motors suddenly using oil, and it was just that, a guide seal. Oil migration??

    From info I've read on KTMtalk, the stock pistons aren't favored because of their ring design, even on the post '08 bikes. Seems Wossner is the piston kit of choice should you go down that road, but it would be worth checking over there yourself, or maybe LukasM will chime in.

    Found it.

  8. Stobie

    Stobie Mr. Motivated

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    +1 on the leak-down test, especially at 100 hours. I didn't do a leak-down on my '09 530 EXC, because I was planning to replace the piston anyway. I bought the bike used, and knew it had been used hard, with an unknown amount of hours/miles on it (PO estimated 6000 miles); and I knew the head was coming off to replace a bad exhaust valve stem seal. Mine was blowing so much oil out of the exhaust port, that oil was dripping off the header flange, and running down the front of the cylinder. But, the seal hadn't lifted, it was just worn out. Or, it's possible it was improperly installed at the factory, which has apparently happened before.

    I went with a Vertex piston, simply because my great local dealer didn't have a source for Wossner, and Vertex is carried by Parts Unlimited. I'm lucky to have a local dealer who is a true enthusiast that supports the local riding community, and I give him first shot at everything I need. The Vertex is a little more expensive, and has some fancy coatings on the skirt and pin, but I've never heard of anyone having a problem with a Wossner. They're both high-quality, and easy to get.
  9. Yellow Pig

    Yellow Pig Allergic to Asphalt!

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    Thanks for the info. I have checked the valve lash and all is in speck. I tried looking at the valve seals, but it's hard to tell if they have moved. Can't see much looking through the valve springs. I plan on doing the leakdown test next week.
  10. Yellow Pig

    Yellow Pig Allergic to Asphalt!

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    From what I've read the stock rings are the issue. KTM uses a single ring versus the traditional doiuble oil ring.
  11. B-Rod

    B-Rod RubberNecker

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    Vertex is another one. Yup, the issue is with the KTM ring. Again, not from my experience, but because I read too much, many have had success with the KTM piston and new rings, but many others have enjoyed relatively short term success.
  12. Yellow Pig

    Yellow Pig Allergic to Asphalt!

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    Can oftermarket rings be put on the OEM KTM piston, or do they have to go w/ their brand of piston?
  13. Assfault

    Assfault Exposed Member

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    The rings need to match the piston. They come as a set, and unless you are putting stock rings back into a stock piston, you are asking for a hung/broken ring at the least. More likely scored barrel and who knows what ever else might be destroyed. Ive had great luck with Wossner Piston in KTM's.
  14. Foot dragger

    Foot dragger singletracker

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    Reading is good,best to figure out whats really wrong before taking it apart,Ned can tell you what to look at as far as the valve stem seal. 100 hours isnt many hours to be assuming it needs a rebuild.
    Stock KTM parts can go many miles. Unless dirt got in somehow,then it needs a rebuild.
  15. Yellow Pig

    Yellow Pig Allergic to Asphalt!

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    I did the leak down test today and the rings are at 40%.

    I have always been meticulous about my air filter and check the air boot between the filter and the carb everytime I clean it to make sure no dirt/dust has gotten through. I even run a filter skin 80% of the time. I'm pretty confident it was not dirt that did the rings in.



    Looking on line for piston & ring kits I cannot find anything for a 2010 KTM 530 XC-W. The only hits I get are for 530 EXCR. I'm assuming they are the same engine/piston, but want to double check.

    The Wossner pistons come in 3 sizes (94.96mm, 94.97mm & 94.98mm) depending on cylinder wear so I'll have to wait till I tear it down to order.
  16. Yellow Pig

    Yellow Pig Allergic to Asphalt!

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    OK

    Took the head off the bike and can't tell what is causing the oil consumption.

    Have a look at these pics and tell me if you see anything wrong.


    Cylinder looks great:
    [​IMG]


    Compression ring looks good:
    [​IMG]


    Oil ring looks good:
    [​IMG]


    Do these valve stem seals look properly seated? Not sure about this one?
    Intake side valves:
    [​IMG]


    Exhaust side valves:
    [​IMG]


    It's definitely burning oil, lots of buildup on the piston and the face of the valves.


    [​IMG]


    The back side of the intake valves looks pretty gunked up leading me to thing the intake side valve stem seals are leaking?
    [​IMG]
  17. Yellow Pig

    Yellow Pig Allergic to Asphalt!

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    Looks kind of like the valve seals to me. Now if it is the valve seals I'm I better off going a head and doing the wossner piston kit w/ the better oil rings and be done with it or just reuse the OEM piston and rings?
  18. KMC1

    KMC1 There is no spoon.

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    I'm not a good one to give you any advice - not the best mecahnic you'll find....:D but I just want to say thank for posting this up for us - ill be arching and learning from this thread! :freaky
  19. Stobie

    Stobie Mr. Motivated

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    You've already got it apart. Wouldn't it suck to put it back together and still burn a crapload of oil? I would go ahead and replace the piston just to improve my chances of avoiding another teardown.

    Besides, valve stem seals shouldn't affect your leak-down numbers, so the pressure is either getting by the valves themselves or the rings. The rings on the stock piston are known to be problematic.

    I should point out that my previous comment, "especially at 100 hours" was not meant to imply that 100 hours is a lot. If you had said 200 hours, I probably would have said not to bother with the leak-down test, just go ahead and replace the piston if it's coming apart anyway.
  20. Stobie

    Stobie Mr. Motivated

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    Oh yeah, I meant to way that my cylinder bore looked like that, too, at more than twice or maybe three times the hours. The out-of-roundness and taper were both less than 0.0005" (professionally measured by an engine machinist neighbor). I deglazed it with a dingleberry brush, and put it back together. Probably only 10 hours on the rebuild so far, but so far so good.