Maintenance & Technical > KX500 Original

Head nuts leaking

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martinfan30:
Why is this occurring? I used a flat piece of marble and 400 wet paper to lap the head and cylinder. Used cometic gaskets from stewart too.

BDI:
What's leaking from the head nuts  :?  Water/coolant  :? You should have used valve lapping compound and glass on top of your marble. Using Sand paper for laping brings bad bad juju :x it will always cause more problems then it fixes. The sand paper will cause the edges of what ever you are lapping to role up and the more you do it the worse it gets. Valve lapping compund Daniel son. :wink:

Jopiz:
Why shouldn't sand paper be used when lapping? That 400 grid is pretty coarse to me. It removes pretty much alloy.
How about lapping it on top of a glass with grid 800 up all the way to 2000 or 3000 grid? I cant see any problems with that. I have always been taught to lap in circular motions. Like number 8.    :roll:
But hey im not a machinist. That valve lapping compund will probably be better since its designed for jobs like that.

-J

BDI:

--- Quote from: Jopiz on July 06, 2009, 11:47:53 AM ---Why shouldn't sand paper be used when lapping? That 400 grid is pretty coarse to me. It removes pretty much alloy.
How about lapping it on top of a glass with grid 800 up all the way to 2000 or 3000 grid? I cant see any problems with that. I have always been taught to lap in circular motions. Like number 8.    :roll:
But hey im not a machinist. That valve lapping compund will probably be better since its designed for jobs like that.

-J

--- End quote ---
I guess it's hard to get but I'll try one more time. As you push the part across the paper or cloth it creates a wave like a boat crossing water creates a wave. This wave even if you can't see it and even if you tape the paper down as tight as you can will take more off the edge of your part.valve laping compound smeared on to a peice of glass does not do this. It will make your part so flat that you can cut yourself on the edge. This trick was tought to me by a guy who owned a full on factory backed kawasaki race team. He told me that what he was showing me is how all the pros do it and the sand paper way is how the squids do it. One thing I can say is I have never had something leak that was done with valve laping compound. I have seen things leak done with paper and seen them get worse with more attemts to fix it using paper.

oic0:
What about paying someone to run it through a mill or lathe?

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