Yes lapping is in my book mandatory!!!!, and I reuse the cylinder/head gasket all the time, but I also lap them every time!!!!
I've said this before in other posts, only to be ignored, and then read about how the head gasket leaked, etc... And they wonder why???
Lapping is easy enough to do, and doesn't cost a lot, the only cost it your time, and having it not leak.
As my write-up states is was done for the 500, which has a design flaw due to the cam chain runs between the two cylinders, but the lapping principal is the same, as is the head gasket, etc....
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violente et ignorantia
ZX-2R BLOG
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I'm not here to change your mind, just to inform.
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