Cylinder head o-ring size?!

[adriano.ro]

I've changed my piston and I found the inner o-ring to large around 75mm diameter, what I need is 72,7mm. My o-ring is Athena, can this 250r 2014 to use difrent o-ring? My friend's 250 2001 use tha large one....

 

[motopsycho87]

Search the athena website. It tells you the sizes there

 

[adriano.ro]

On the athena website is only larger size and is for 2005-2013, different o-ring in 2014-..?,I'm confused, anyone use athena o-rings? ?????