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Discussion Starter #1
So I was searching online for some different ideas to augment my 04 ZX12R. Up until today (Saturday, 9/19/20) I was only aware of three (3) big bore choices: 1270cc, 1287cc and 1290cc. That was it...that was all.

Well, I found out that CP makes a +2mm piston bringing the size of the motor to 1257cc. This was mind-blowing to me because I'd NEVER heard of these smaller big-bore pistons. Has anyone tried these or know of anyone who's used the smaller hammers? Any, and I mean ANY information on these would be greatly appreciated. Thank you.

GSXR
 

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Discussion Starter #2
I'm assuming the lack of response indicates that like me, many of you had never heard of the 1257cc pistons either. The 1270 and the 1287 are so popular that any/every other bore size was overlooked. At least that's what happened in my case.
 
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