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Thread: Valve issue help (video)

  1. #46

    Excellent observation

    Quote Originally Posted by Pauls1150 View Post
    Maybe it's just the lighting in the pictures, but have you been able to verify that the valve collets ("keepers") are all there and whole?
    If you compare the visible valve stem above where the keepers are it appears as though the exhaust valve has about an 1/8" more valve stem showing above the keepers than the intake valve. Maybe the "snap" was a keeper (collet) popping out

  2. #47
    Registered User ebeeby's Avatar
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    Quote Originally Posted by 69zeff65 View Post
    If you compare the visible valve stem above where the keepers are it appears as though the exhaust valve has about an 1/8" more valve stem showing above the keepers than the intake valve. Maybe the "snap" was a keeper (collet) popping out
    I agree with this. Looks like something happened to that collet compared to the others.
    1973 R75/5

  3. #48
    Registered User AntonLargiader's Avatar
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    The collet would only affect spring height, not valve stem position. The valve stem height is determined by where the valve closes, and I think this is the problem. Likely a dropped seat, as mentioned before. Again, a good pic of that area would help.
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  4. #49
    Registered User barryg's Avatar
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    The only way to get a good pic is the disassembly of the head and the head and components completely cleaned for examination.

  5. #50
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    Quote Originally Posted by AntonLargiader View Post
    The collet would only affect spring height, not valve stem position. The valve stem height is determined by where the valve closes, and I think this is the problem. Likely a dropped seat, as mentioned before. Again, a good pic of that area would help.
    Correct! The spring and related hardware have nothing to do with valve clearance. At this point with the head off I would pull the valve and check the seat to make sure it is in the counter bore when it belongs.
    From the only real Fargo, ND!

  6. #51
    John D'oh
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    One last observation: the pushrod is not centered in the pushrod tube as it exits the head under the adjuster on the affected rocker. The other one is centered as it should be. Nothing about the combustion chamber looks off. An earlier post mentioned lifters so Id go there next.
    John D'oh

  7. #52
    Bluenoser
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    Looks like you need to take the intake valve out as it does look like it is sitting a bit proud. Anything come loose from the front of the carb, like one of the throttle butterfly screws. It does appear as if something might have jammed the valve partially open. A piece of carbon could do the same. Shine a light inside the intake of the head and look at the point where the valve contacts the head. If you see some daylight between the two you found your issue.

    It is common for carbon to build up on the back of the exhaust valve but not the intake. But anything is possible.
    1995 R100Rt with Kenna Sidecar, 1986 K100RT

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