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What is buring up my valves?

Discussion in 'The Garage' started by WacoBrian, Mar 7, 2011.

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  1. WacoBrian

    WacoBrian XS650 Junkie

    really what ya'll think?
    is it my timing skills :doh:
    it is a lower end 81, jugs and head are matching 78, 2nd over size pistons,
    truly homemade pipes, hot pamco, k&m pods, stock gears, about a year an a half ago,
    had it to 100 or so 1- 2 -20 times. put it up for sale go to warm it up for buyer haha
    not happin. pulled the motor apart :mad:

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  2. WacoBrian

    WacoBrian XS650 Junkie

    sorry dudes Evan tonight, exhast valves
     
  3. littlebill31

    littlebill31 Smells of Raw Fuel

    Hmmm. Picture #2 is not very clear. I can, however, read the fridge stickers quite well.
     
  4. WacoBrian

    WacoBrian XS650 Junkie

    if i got you a good pic could you get me a hint?:shrug:

    just black no burn groves or nothing
     
  5. Have you done any jetting...BS34's are shitty lean from the factory...Timing is also a little advanced from factory on TCI bikes to help with emissions.
     
  6. WacoBrian

    WacoBrian XS650 Junkie

    no man igot the 78 --38 carbs
     
  7. azman857

    azman857 '80 XS 650SG Rider XS650.com Supporter Top Contributor

    Hmmm, going by the first pic, it looks like your valve is landing on the outer edge of the head, not the middle of the sealing area. Not good. Possibly the clearence set too tight also. How many miles on these valves?
     
  8. guess that rules out carbies for now.
     
  9. WacoBrian

    WacoBrian XS650 Junkie

    got about 2500 on it
     
  10. Travis

    Travis Staff Member XS650.com Supporter

    Love the fridge stickers!
     
  11. XS650_Bobber

    XS650_Bobber Working in my project


    +1 Excuse me for the offtopic
     
  12. 5twins

    5twins XS650 Guru Top Contributor

    19,390
    10,712
    813
    The pictures do suck but it looks like it's running rich. Are the valve seats in the head all black with carbon too? What size jets are you running?
     
  13. WacoBrian

    WacoBrian XS650 Junkie

    no real black but some, plugs always looked ok, carbs are stock 78-79- stock jets, clip in the middle of main,
     
  14. WacoBrian

    WacoBrian XS650 Junkie

    thanks i kinda collect'm and put them on magnets:laugh:

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  15. WacoBrian

    WacoBrian XS650 Junkie

    more pics

    the intake looks good

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  16. xschris

    xschris from earth

    469
    15
    18
    usa
    that spark plug looks as white as a ghost, too lean to me.:yikes:
     
  17. azman857

    azman857 '80 XS 650SG Rider XS650.com Supporter Top Contributor

    It's time for a valve job. Intake contact is on the outer edge and the exhausts are too wide. It takes up the whole landing! How much do the valves wiggle in the guides? It's time to get things back in standard.
     
  18. WacoBrian

    WacoBrian XS650 Junkie

    yeah that one wiggles a lil to much for me
    no cheap quick fix for this one,should have redid the valves when i had it open couple summers ago,when i had a good job, would like to just replace the bad valves and guides new seals for all.
     
  19. WacoBrian

    WacoBrian XS650 Junkie

    well i have been doing some valve laping this past weekend just about to put it back together
     

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