what is y-1 or y-2 on cylinder caseings mean... yamaha yz125

[8780vette]

i have a cylinder on my bike that is marked 2hg00 y-1. the head has y-1 on it aswell.

i bought a new cylinder says 2hg00 y-2 on it. can i put my y-1 head on y-2 cylinder????

what does y-1,y-2 even mean??
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jake

[Paulington]

Less than 15 seconds of typing in to Google came up with this website which answers your questions completely.

Cheers!
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"Four wheels move the body, two wheels move the soul."
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CBT: 27/08/08. Theory: 04/09/09. Module 1: 16/09/09. Module 2: 01/10/09.

[Conon]