How do you tell what CC engine you have?

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Size measured

Hello, I measured the bolts and they are 1 1/4 or 1.125 mm is 28.5 I also found that the spark plug was bad lol.
 
looks like a 66cc with the head leaking
gonna have to fix that and get the head/cylinder flat/square and replace the POS factory studs with grade 8
www.sickbikeparts.com has the studkit
 
Finding parts

I thought that looked like a leak but were do you get a head gasket, can i make one I have a full shop.
 
Got myself a similar scenario here I still can't figure it out I still have plenty more left to build on this thing, any of y'all built one of these things up?
You do realize you just replied to a thread that had it's last reply 13 years ago, right? There is digging things up from the grave, and then there is archaeology.
 
You do realize you just replied to a thread that had it's last reply 13 years ago, right? There is digging things up from the grave, and then there is archaeology.
And just one more reason I am deleting the posts that people make on something so ancient and why I lock old threads like this.
 
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