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2022 ZX-6R KRT ABS
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Head bolts are meant to be replaced with each use, as I understand it.
What year are we talking about? I think the washer has to be replaced with each use, but not the bolt itself...

(But what you said still holds -- I would never use a non-oem head bolt.)

I believe there are two different size head bolts -- M6 on the end and M9 throughout.

See below for 2013 vintage:

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2022 ZX-6R KRT ABS
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PS Looks like you are probably talking about 2008...

Wow, for 2008, even the washer does not call for replacement -- lucky you!

From the parts page you can see how many of each you have -- 2x M6 and 10x M9:

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The head doesn’t seem to pop out. It feels like it’s still connected to something.
Hopefully nobody put goo on your head gasket...

To be sure, you removed 12 head bolts (10 long and 2 short).

In the 2008 service manual, it also calls for you to remove the "front camshaft chain guide bolt (upper)"... Did you remove that? Is yours 2008?

(Strange in later manuals, it also calls for you to remove the "front camshaft chain guide bolt (lower)", as well as the front and rear guides and dowel pin, but not in 2008.)

I usually just use a 2x4 or something soft to pry the head little-by-little evenly around all sides when I'm sure it is free -- but be absolutely sure it is free...

(Maybe someone has a much better suggestion?)

From 2008 service manual:

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