Fcr problem. suggestions welcome.

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by FINNDIAN, Mar 29, 2013.

  1. FINNDIAN

    FINNDIAN Mine goes to 11

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    39fcr kit

    The base threads into the carb body. This one must have been loose for some time. Now threads are worn of both sides. Anyone seen this before?
    Thinking the only solution might be a whole new carb.

    Sent from my Droid RAZR using tapatalk 2
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  2. Idle

    Idle Been here awhile

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    JB Weld!
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  3. HeatXfer

    HeatXfer Bad knees

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    I can't tell from the photo, but are the threads in the carb body as bad as the spigot? If the receiving threads in the carb aren't worn too bad a new spigot could be carefully threaded on with a little blue loctite 242?

    .2ยข
    #3
  4. FINNDIAN

    FINNDIAN Mine goes to 11

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    no. It's very bad on both sides. no interferance fit. very loose now.

    How is jb weld with gas and vibes? It'll take a lot :eek1
    #4
  5. CRW

    CRW I dont want a pickle

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    Maybe Devcon instead of JBweld. seen a lot of internal engine repairs done with it......
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  6. HeatXfer

    HeatXfer Bad knees

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    Were you thinking Devcon Titanium putty? That stuff is great. I've used it for gap filling between shafts and bearing races, filled in surface imperfections on rotating stock and I've used it instead of Helicoil inserts on emergency equipment repair. It is a little pricey - $120/lb, but it lasts a long time in the can and you'll find a million uses for it once you've tried it.

    If both surfaces are thoroughly wire-brushed to clear any loose aluminum out of the remaining threads and roughen the other contact surface areas, that would give the putty a lot of rough surface to adhere to and once cured would be nearly the same a weld.
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  7. StevenD

    StevenD Hmmmm, dirt!

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    That, or get it welded. A good welder can probably do that nicely with very low amps. Meight have to do some specialized cleaning before though, good idea with epoxy as well.
    #7
  8. CRW

    CRW I dont want a pickle

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    Yup that's the stuff. It is pricey for sure. I have found it in small tubes at O'rileys auto parts (old Kragen).....

    Welding that would be very tricky.... But what do I know I'm a welder/fabricator by trade..... The carbs are an expensive peice of kit if I recall correcttly.
    #8
  9. CRW

    CRW I dont want a pickle

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    Just a thought. Find a gas resistant material and make a gasket to bush between the surfaces and drill and tap. Tap the material that has the most thickness(looks like the carb body).

    Or bring it by a decent machine shop to see what they can offer.

    EXPLORE ALL OPTIONS BEFORE FLIPPING THE CASH FOR NEW CARBS!!!
    #9
  10. pdxmotorhead

    pdxmotorhead Long timer

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    If you can buy the new piece with fresh threads, then clean up the threads in the carb body, might get enough bite with a bit of locktite or epoxy to salvage it..

    I've fixed tractor blocks with JB weld,, I'm sure it would take the beating..

    Dave
    #10