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Wiseco Sizing

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Hi guys, I have this Wiseco piston for my 03CR125

 

http://www.wiseco.com/ProductDetail.aspx?ItemID=676M05400

 

What I didnt noticed when ordering it, is the fact that it comes in STD for Standard Bore cylinders and not in 53.95, 53.96, 53.97 (A,B.C,D) sizing life other brands do. I ampretty confused now, Help! Thanks

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Two sized cylinders for our CR125s, A and B. B is smaller bore by very small amount. It it lightly stamped on base of the cylinder, intake side I think.

 

A 53.976 - 53.983 (2.1250 - 2.1253) Service Limit 54.013 (2.1265)

B 53.968 - 53.976 (2.1247 - 2.1250) Service Limit 54.006 (2.1262)

 

Out of Round, Taper or Warpage - 0.05 (.002)

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I have just found out by measuring my piston that my bike runs a 55mm overbored piston lol!

 

I was so lost when I my 54mm wiseco had some play while inserting it!

 

since the 56 mm is the 134cc, what is a 55 overbored to?

 

I bought the bike as a 125. The previous owner didnt know what he had...

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