Vintage KTM GS500 dirtbike any info?

Discussion in 'Thumpers' started by herman maire, Jul 25, 2012.

  1. IheartmyNx

    IheartmyNx Ihave2draft

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    That would make a way cool Retro-Sumo build...


    There, I said it...


    Inspiration? Here ya go...

    [​IMG]

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    #21
  2. danketchpel

    danketchpel Long timer

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    Those are some very cool bikes.

    I particularly like the TT500, sweet.

    I think the OP's KTM 504 will make a very nice dual sport bike.
    #22
  3. smokeeater495

    smokeeater495 Been here awhile

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    Subscribed. A very cool old bike. Glad to see you got lucky with the motor.
    #23
  4. Roadrunner II

    Roadrunner II n00b

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    Greatings from Switzerland

    We have here a specialised Dealer for KTM-Oldtimer. Here's the link the the Webpage:

    http://www.sdi-ktm.ch/index.php

    Maybe you will find what you need. But remember: the shipping cost from CH to the States may kill you :lol3
    #24
  5. 3uba296

    3uba296 Thumpcurious

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    Love it! :lurk Keep us posted!
    #25
  6. xr400r

    xr400r Long timer

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    You will be smiled upon for taking on this project. Good luck with it and yes very rare. The only one ive seen. I love those old bikes!
    #26
  7. MZRider

    MZRider Neo-Luddite

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    I'm working on converting my scans of the manual to .pdf files and will then upload it to Scribd for everyone to view. Will let everyone know when it's ready.
    #27
  8. MZRider

    MZRider Neo-Luddite

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    Here's a link to the complete manual in .pdf form:
    http://www.scribd.com/doc/103218934/KTM-Owner-s-Repair-Manual

    For some reason the program I used to convert the jpeg images to a .pdf shuffled the pages a bit. The first 13 pages or so are scattered throughout the rest. Everything is there though. Enjoy!
    #28
  9. Rot Box

    Rot Box Been here awhile

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    Dang I don't know how I missed this one!! :eek1

    Cool bike thats for sure! Keep Keith at http://americandirtbike.com/ and Lee at www.atkusa.com in mind they both deal with the big Rotax and know everything there is to know about them. Along with stocking many parts they are great guys to have saved in your phone. That same engine was virtually unchanged for 20+ years and it is a model of reliability. It a good consensus to change that timing belt (with the OEM Dayco brand only) every season as they are an interference engine. and it is also recommended that you set your valves at a tight .004" NOT .002" like the manual states. If the KTM is anything like the ATK's you'll want to add about 1.5 quarts of oil then run the bike for a minute and add the rest. If you try to just fill the tank up and call it good chances are you'll be low on oil. Lastly that bike "should" have the typical 190W lighting coil in case you want to power a third world country :eek1

    Can't wait to see more!

    Btw that big idle pulley (timing belt) takes a standard sized bearing found at any bearing store so I'd replace that while you have it apart. The little one is something like $90 so hopefully you don't need one of those!
    #29
  10. Navin

    Navin Long timer

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    Rechroming the forks??? PM me if you want a deal on a sweet 50mm WP front end complete, from the triples to the Excel wheel, needs fork seals. I think I even have the original full brake system. Should bolt right on your bike. Might be the best conventional forks ever made. Off a 20 hour 1999 125SX. Great condition.

    Good to see it is getting saved! :freaky
    #30
  11. herman maire

    herman maire Been here awhile

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    Thank you for all the replies. I apologize for not posting any updates.

    Unfortunately, I dont have much progress to post. All the engine machine work and new parts have been addressed. I just have to assemble it now.

    Does anybody have some suggestions for the rear shock. The rear shock is in very poor condition and would cost quite a lot to refurbish. The shock piston is pitted, the rubber line is dry rotted and the spring has rust.

    Is there any rear shocks from another bike that would possibly fit.

    Thank you. :ear
    #31
  12. MZRider

    MZRider Neo-Luddite

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    Hi Herman,

    I may have a good used original rear shock. Let me dig it out and I'll get back to you.
    #32
  13. herman maire

    herman maire Been here awhile

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    That would be great :clap:clap . I did some looking around last night and found a few companies that have replacement parts for these old FOX TWIN CLICKER rear shocks . If anybody else is interested, here are the links that I found-

    http://ltthor.home.comcast.net/~ltthor/FTC.html
    http://www.gmdatl.com/services.htm
    http://www.offroad-engineering.com/shock-parts-fox-shox-parts.html
    #33
  14. herman maire

    herman maire Been here awhile

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    I actually think it may not be a dual clicker shock since I dont see any adjuster on the shaft end. :huh
    #34
  15. MZRider

    MZRider Neo-Luddite

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    Here's the shock that came with my KTM 504 chassis. Looks like a WP not Fox. Good condition over all, usual signs of use and the reservoir is faded. Damper rod has no rust pits or other damage that I can see. Measures 18" eye-to-eye.

    [​IMG]

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    #35
  16. herman maire

    herman maire Been here awhile

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    Charlie,

    thanks for the pictures, that does indeed look like the same unit I have. :clap I will measure mine tonight when I get back. How much $ did you have in mind ? PM me if you prefer.

    For some reason, the reservoir looks twice as large but that could be just the picture.

    Is this also a air shock like the Fox?
    #36
  17. MZRider

    MZRider Neo-Luddite

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    Western MD
    PM sent.
    #37