quick response needed

125 rider

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#1
Im rebuilding an 02 kx85 and the head is marked E 1. The Pro-x piston i have is marked A. If i put it in is it going to crack on me or are these such small measurements that its safe to put it in?
 

bclapham

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#2
the E1 on the head is probably a casting code and will be stamped on every head right back to 88 or something!

the code ofr the cylinder size is usually on the back of the cylinder