That's the location of the original ring locating pins. I found that the 2017 KTM 300 has the same ring pin location so I went with it. The proX is a cast piston so there's a lot less machining required in comparo to a forged piston. I'm in the process of doing heat cycles for the break in. I didn't put the ground wire that uses one of the bolts to hold the coil and the Electric starter wouldn't work. Fixed that today and now the button works. lol
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