650/X-2 What kind of piston is this?

[Dustin88]

I just got a 650 x2 and it has these ART pistons in it, I have never seen a piston with grooves all the way down it.

Anyone ever seen this before? What are the benefits?

 

[wanderer1]

Look like oil rention grooves like we used to use in piston port motors.

 

[Dustin88]

Oh ok, never seen those on a kawi 650

 

[Captain PegLeg]

Looks gay. Mainly because its your piston....