Bad gasket Replacement = Wont Start

Discussion in 'The Garage' started by tyreybel, Feb 2, 2014.

  1. tyreybel

    tyreybel Adventurer

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    Bike was running around 3000 rpms at idle this fall. Still rode it a lot. But wanted to get it in good running condition.

    Engine had a horribly degraded head gasket (you could see air coming out), so I took it apart and replaced all the top end gaskets. Adjusted the valve shims and had a shop change my valve seals while I had it apart.
    Also took some rust off the exhaust pipes and clear coated them.
    Put it back together and it wouldn't start. Got a good spark on the plugs and the cams all rotated smoothly, so i figured it was the carbs.
    Took the carbs off and cleaned them, they are getting oodles of gas now, and there is a new filter in the intake.

    Still wont start and I am flat out of ideas.
    Anyone have a thought?
    #1
  2. tyreybel

    tyreybel Adventurer

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  3. anotherguy

    anotherguy Long timer

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    Cam timing or valve clearance too tight.
    #3
  4. bisbonian

    bisbonian Long timer

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    +1
    Double check your timing.
    #4
  5. mcma111

    mcma111 Long timer

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    Is there gas in the tank??

    Got spark???
    #5
  6. Cogswell

    Cogswell Spudly Adventurer

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    As noted above...

    Pull a spark plug out and see if it has gas on it. Insert it back into the spark plug cap, lay it across the top of the motor so the metal base of the plug is in contact with the head. Switch the key on and press the starter button, do you have a good strong spark at the plug gap ?

    :ear


    Mike
    #6
  7. tyreybel

    tyreybel Adventurer

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    Spark is good on all the plugs, pulled them and they are all strong blue.

    Can timing is good. Double checked when assembling, and is turns over smooth if I do it manually.

    And haha Yea, it has gas. I've forgotten that enough times

    Checked valve clearance with gauge. All clearances in spec.
    #7
  8. anotherguy

    anotherguy Long timer

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    Time to check cranking pressure. On all four holes.
    #8
  9. tyreybel

    tyreybel Adventurer

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    Waiting for an ordered compression tester to come in. Will report back.

    Thanks for all the tips
    #9
  10. Cogswell

    Cogswell Spudly Adventurer

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    Ignition timing 180 Deg out ? Have you sprayed any "helper" into the air box while cranking to see if you get it to light or pop ?


    Mike
    #10
  11. tyreybel

    tyreybel Adventurer

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    Nope, I haven't tried any starter fluid. Was hoping that I can get it going without. But Yea I will give that a try.
    #11
  12. joexr

    joexr Banned

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    This is a good point. You could switch the two inner spark plug caps with the outer two.
    #12
  13. PeterW

    PeterW Long timer

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    Be a bit careful here, it's quite hard to steer a bike that's running backwards.

    Pete
    #13
  14. trailer Rails

    trailer Rails Long timer

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    Why is it that people hesitate to reach for the starter fluid? I have seen a couple threads here recently where people where having starting issues and refused to use starting fluid. I use the stuff all the time, it is a lot easier to adjust a carb when the bike runs. Is there something I am missing?
    #14
  15. AustinJake

    AustinJake TE450-KLE-FXDWG

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    #15
  16. H96669

    H96669 A proud pragmatist.

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    You had a very leaky head gasket? Did you check to see if the head was flat?
    #16
  17. jtworldwide2

    jtworldwide2 Adventurer

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    Agreed.
    have you tried watching the valves move with a pencil in the cylinder bore to make sure you have the cam timing right?
    That motor sounds like the valves are being held open all the time.
    #17
  18. AustinJake

    AustinJake TE450-KLE-FXDWG

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    Or, they are being held open at the wrong time and bleeding off compression, and compression is a vital part of running, just like gas, air and spark, ya gotta have compression or there's no POP.
    #18
  19. sieg

    sieg Long timer

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    :lurk
    Wow you've done soooo much that it could be sooooooo many things.

    You need:
    1) fuel, you seem to have that. But you messed with the carbs so it could be maladjusted, but should still fire.
    2) spark, you seem to have that.
    3) compression, you had it when you took it apart... you should have it now, but check.
    4) correct timing, (of #2 & #3 above) you had better check that again, or have someone that knows check it.
    #19
  20. joexr

    joexr Banned

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    Surely you jest.:huh
    #20