piston size ?

[oneday]

i am in the process of installing new rings on my banshee, however i am not sure of the replacement size? on top of piston it has an arrow obviously showing you the way the piston is installed, it also has the letter "G" stampped on it.

 

ANY IDEAS OF THE SIZE?

pistons/bore look good, no scratches or visible damage.

 

THANKS ONEDAY.........

[boonman]

What is the Outside Diameter of the piston?