Valve Job: Recommendations?

Discussion in 'Dakar champion (950/990)' started by wiseblood, May 8, 2015.

  1. wiseblood

    wiseblood Quid Quo Pro Supporter

    Joined:
    Dec 29, 2008
    Oddometer:
    25,692
    Location:
    New York City
    This is for a 2007 950 SMR.

    I have a leaky intake valve (10% leakdown). I already have the engine removed, and I'm taking off the head this weekend.

    Can anyone recommend someone / a shop which can do a solid valve job on an LC8 head? Preferably in the northeast, but not strictly necessary.

    Thanks!
    #1
  2. halfcab

    halfcab Been here awhile

    Joined:
    Apr 6, 2007
    Oddometer:
    687
    Location:
    Dog Patch S.C.
    I STRONGLY!!! HIGHLY!!! suggest you look for someone that specializes in 4 valve Drag Bike cylinder heads.

    Make sure they have and know how to use a Serdi Seat & Guide Machine......Don't fall for any other BS.......

    I have personally used the Serdi Machine.
    Don't be surprised if the Serdi operator ask for your camshafts, then ask what shim.

    Good Luck.
    #2
  3. wiseblood

    wiseblood Quid Quo Pro Supporter

    Joined:
    Dec 29, 2008
    Oddometer:
    25,692
    Location:
    New York City
    Thanks for the suggestion. I don't know that if even know how to find someone like that!

    I'll look around. I'm hoping that someone in the OC can recommend a shop they've used. I'm completely new to this sort of service.
    #3
  4. Rharr

    Rharr Been here awhile

    Joined:
    Apr 5, 2014
    Oddometer:
    893
    Location:
    Tucson Az
    APE racing is a shop that comes to mind. In cali though.
    #4
  5. wiseblood

    wiseblood Quid Quo Pro Supporter

    Joined:
    Dec 29, 2008
    Oddometer:
    25,692
    Location:
    New York City
    These guys?

    http://aperaceparts.com/headwork.html

    California is not a show stopper. Sure, it would be nice to not have a 10-day shipping round trip, but CA is where the bikes are.
    #5
  6. ICERIDER

    ICERIDER Adventure Rider

    Joined:
    Jun 23, 2006
    Oddometer:
    876
    Location:
    Stanley Falkland Islands
    You could be letting yourself in for a costly refurb here.

    If you haven't suffered huge changes to your valve shim settings surely your seats and valves cannot be so badly worn.

    Probably all you need to do is 'lap' the valves in with grinding paste to re-seal them. Up to you.
    #6
  7. charlie264

    charlie264 Long timer

    Joined:
    Oct 27, 2007
    Oddometer:
    11,786
    Location:
    Blighty
    How warn are the valve seats? I doubt you need to replace the seats..major job. You could just get a kit and resurface yourself...removing minimal about...

    Then just lap the new valve in...
    #7
  8. wiseblood

    wiseblood Quid Quo Pro Supporter

    Joined:
    Dec 29, 2008
    Oddometer:
    25,692
    Location:
    New York City

    I'm pulling the head now. Will take a look and post pictures.
    #8
  9. halfcab

    halfcab Been here awhile

    Joined:
    Apr 6, 2007
    Oddometer:
    687
    Location:
    Dog Patch S.C.
    My guess....with only 10% leakage all they will be doing is refacing, narrow up the seats, maybe change an angle are so, maybe some blending.

    The parts will cost you a lot more then the machine work.


    Yes..with only 10% leakage you could lap new valves in yourself. Hell...that was my wifes job back in my drag bike years.

    I would lap first to find why the leakage, where/how wide the seat is to start with.
    #9
  10. charlie264

    charlie264 Long timer

    Joined:
    Oct 27, 2007
    Oddometer:
    11,786
    Location:
    Blighty
    Resurfacing stones are about 40 quid, seat cutters hire out at about 10 quid a day.
    #10
  11. Rharr

    Rharr Been here awhile

    Joined:
    Apr 5, 2014
    Oddometer:
    893
    Location:
    Tucson Az
    Yes, that's the place.
    #11
  12. jconly

    jconly Been here awhile

    Joined:
    Aug 18, 2009
    Oddometer:
    596
    Location:
    NYC
    Maybe it's out of his world, but why not try Chris @ spanner land?
    At the very least, I'm sure he can point you in the right direction.
    #12
  13. wiseblood

    wiseblood Quid Quo Pro Supporter

    Joined:
    Dec 29, 2008
    Oddometer:
    25,692
    Location:
    New York City
    :freaky Excellent idea!
    #13
  14. wiseblood

    wiseblood Quid Quo Pro Supporter

    Joined:
    Dec 29, 2008
    Oddometer:
    25,692
    Location:
    New York City
    So, got it apart this morning before work.

    [​IMG]

    :*sip*

    This is my first time getting this far into any motor! Really fascinating... would be kinda awesome, if not for the fact that I'd rather be riding! :ricky

    Anyway, to my fairly untrained eye, the valve seats look pretty good, especially on the intake side!:

    [​IMG]

    [​IMG]

    Exhaust side is a bit more grudgy, but that is to be expected. And, the leak was on the intake side. :dunno

    Here's an over-all of the head. Click to zoom!

    [​IMG]
    #14
  15. charlie264

    charlie264 Long timer

    Joined:
    Oct 27, 2007
    Oddometer:
    11,786
    Location:
    Blighty
    Can you take a close up photo of the offending valve, especially side view. And if you can a straight edge on/near parallel to sealing surface. Looking at the photo you cant tell if its dished.

    Seats look fine/serviceable...no notches or chips.
    #15
  16. wiseblood

    wiseblood Quid Quo Pro Supporter

    Joined:
    Dec 29, 2008
    Oddometer:
    25,692
    Location:
    New York City

    It's at least two valves (both intakes). I'll get those pictures as soon as I get back to the garage! :beer
    #16