Maintenance & Technical > KX500 Original

02 KX 500 head gasket leak

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stewart:

--- Quote from: mdw471 on January 25, 2008, 02:52:45 AM ---Great Idea!!

After you have lapped the head and barrel the first time, does it stay flat even after use? Or do you redo it everytime you change the piston?

Does the lappong correct a manufacturing short coming or does heat cycling the engine cause it to 'warp' out?!?

Mark

--- End quote ---
proably some of both

kaw rider:
also when you install the stud, don't over tighten and put a 45* cut on the hole. so the aluminum doesn't roll up around the stud.

BDI:

--- Quote from: kaw rider on January 25, 2008, 06:46:02 AM ---also when you install the stud, don't over tighten and put a 45* cut on the hole. so the aluminum doesn't roll up around the stud.

--- End quote ---

           Very,very good advice on the stud thing.
   
     I never ever use emery cloth to lap things it roles up the edge of what ever you are trying to make flat. I use valve laping compound on a piece of glass on top of a piece of granit. I clamp it all down on the work bench with rubber jawed wood working clamps and use the old school figure eight method. I don't lap them together because I figure that if it's as flat as the sheet of glass then It's good. I have never had a problem with this method and I have fixed a bunch leaks on many different things.

The Flyin Hawaiian:
Im not sure I understand the 45* cut. Are you basically chamfering the stud hole?

BDI:

--- Quote from: The  Flyin Hawaiian on January 25, 2008, 12:24:31 PM ---Im not sure I understand the 45* cut. Are you basically chamfering the stud hole?

--- End quote ---
    Yes if you don't the unthreaded portion of the stud mushrooms the deck around the studs if you screw the studs in  tight

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