2002 lc4 wet oily rear rim

Discussion in 'Thumpers' started by drmax, Aug 21, 2013.

  1. drmax

    drmax Been here awhile

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    Hello. My ole bike has 51k on her and have been noticing my rear rim gets oiled up without me doing the chain. Haven't pulled the sprocket cover off yet but I'm thinking its the drive shaft seal leaking. I know there is a thread here, but is this a bitch to repair? I rely on her every day to drive to work.
    Thx, DM
    #1
  2. mcma111

    mcma111 Long timer

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    Replacing the counter shaft seal is easy. Clean the shaft and the area around the seal with a tooth brush and a can of brake clean. Get an ice pick and drive it in to the seal and pry the seal out. Apply some oil to the new seal and tap it back in place. Make sure that it's flat across and doesn't have one side in deeper than the other. Your done!
    #2
  3. drmax

    drmax Been here awhile

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    Cool, I'll take that cover off now and make sure that is the deal. Then order a seal (which I'm sure the freight will be more than the seal) then report back. Thx from Indianapolis....DM
    #3
  4. gunnerbuck

    gunnerbuck Island Hopper

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    There is a 90% chance that it is not the seal that is leaking but rather the silicone O-ring that sits inside the bushing... Before you go tearing the seal out look at the condition of this O-ring, it is simple to change...
    #4
  5. drmax

    drmax Been here awhile

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    Are the seal and o-ring easily found on an IPC? I'll just order those along with the smaller particle oil filter metal gasket, as it has never been changed and is seeping a bit. Thx, DM
    #5
  6. gunnerbuck

    gunnerbuck Island Hopper

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    The O ring is made of silicone and is 2mm x 25MM, they are about $2 each through KTM, part # 0770 250021...
    I change this o-ring every time I replace the C-sprocket... As for the seal, I've run them for 50,000 KM with no leaks...
    #6
  7. drmax

    drmax Been here awhile

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    The picture I found seems to show the oring you speak of, behind the shaft seal ring with the other fella said to change. You saying this $2 oring is just picked out, under the drive sprocket? I may order up that larger seal, if it ain't too pricey. It does have 51K on it. It must be coming from this area, but it isn't making it to the engine case...it must be just getting to the sprocket and flinging off of it.
    #7
  8. drmax

    drmax Been here awhile

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    After all these years I never replaced the screw/spring that goes on lastly, on front sprocket. Is it necessary to change this item out? part
    590.33.034.044
    #8
  9. gunnerbuck

    gunnerbuck Island Hopper

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    I don't change the spring washer every time I swap the sprocket, more like every 2nd or 3rd time... I'll take the old spring washer and set it round side down inside a 1 1/4" socket and then use a ball peen hammer as a drift to add some spring flare back to the washer...

    At 51 K it wouldn't hurt to replace all the seal components, this would be the case seal, the bushing along with the O-Ring...
    #9
  10. drmax

    drmax Been here awhile

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    Ah, that's what me thinx too. Is this a pita getting this stuff out? If you have any advice, please let me know. I'm gonna order up this stuff. Thx, DM
    PS. ouch, that bushing was salty...$15. (yep I'm cheap)
    #10
  11. Foot dragger

    Foot dragger singletracker

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    51K on a Lc4 and just now putting a Countershaft seal in.

    That's quite a run.
    #11
  12. drmax

    drmax Been here awhile

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    This seal (not the oring) is only design to keep oil in and dirt out, right? It's not meant to support this shaft in any way, is it? Can someone tell me what kind of problems I'm gonna have getting this oring, seal and bushing out? Why would it be necessary to replace the bushing? I just ride her and change the oil and only do mx when necessary. (adjust the valves every 10K) Thx gents. DM
    #12
  13. gunnerbuck

    gunnerbuck Island Hopper

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    Changing that seal is relatively easy... You can inspect the bushing and make the call whether to replace it... What happens is that over time the seal will cut a groove into the bushing...

    Here is good how to thread: http://www.advrider.com/forums/showthread.php?t=102920
    #13
  14. drmax

    drmax Been here awhile

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    Gunner, I'm not sitting here with the bike in front of me...uh, so I don't have to drain the oil for this, do I? I'm thinking not. I just don't want a mess. Thx bro as I'm preplanning my excursion. DM
    #14
  15. gunnerbuck

    gunnerbuck Island Hopper

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    No worries about the oil leaking out, but it will still be messy as you will want to clean all the grunge away from the sprocket area to avoid getting debris inside the seal upon reassembly...
    #15
  16. drmax

    drmax Been here awhile

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    gotcha. i'll run by the auto store this morning and see if they sell a puller. I may have to fabricate something. thx man
    #16
  17. drmax

    drmax Been here awhile

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    I see that the shaft seal appears to be holding up just fine. It's not wet around the bore of eng. half, unless I'm missing something. In face, the inner portion of the rubber seal is dry. I'm leaving this puppy along. Now, I noticed the bushing is nearly 1/16" narrower than the new 12mm bushing...part number 54633014100 than the old one removed. I called KTM parts and they said I have the correct bushing. I'm assuming it has narrowed over time (wear) Seems like a lot of material lost, for a hardened bushing. It is barely grooved. My concern is the width of the new bushing being wider. Since it is the correct part, I'll slap it back together with new oring and run her. It really don't look like it was leaking, but must have been. Let me know if you think this new bushing width is wrong. thx, DM
    #17
  18. drmax

    drmax Been here awhile

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    the old one measures 10mm. When I put on the sprocket and snugged down, it is not flush with the drive shaft like the old one. Is this ok? Thx, DM
    #18
  19. drmax

    drmax Been here awhile

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    I've ran the bike on a crate with front sprocket only for maybe 10 min's...with mirror no leaks noted. Put on the chain and it is tracking ok. I'll assume again the 2mm diff. in bushing width isn't and issue. Will torque sprocket accordingly and ride it and see if it still splatters oil. If so, then I'll replace that shaft seal. If not, then we're good again until the next pit stop. Pretty quiet here at thumper haven. Guess yall are having some wobbly pops...as I am. Take care. DM
    #19
  20. drmax

    drmax Been here awhile

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    Ran well and sounded fine. Washed rim and will keep an eye out for the oily specs on the rim to reappear. Have a good holiday weekend folks. DM
    #20