2011 YZ450 I installed a GYTR head with Vertex High compression piston. The engine turns over so far but it seems the piston is touching the head or at least binding. Does anyone know if the GYTR head combustion chamber is different from stock? Has anyone run GYTR head with Vertex HI-COMP Piston and Hot Cams? Trying to determine what the issue is that is causing the binding. I thought I may have installed the piston backward. I installed it with the arrow toward the intake (front of the bike). I believe this is correct. Any help appreciated, I assembled and disassembled head/cylinder bunch of times today, cannot determine actual issue. I am going to contact manufacturers Yamaha /Vertex/Hot Cams see if I can get any info from them. However, I thought the GYTR head was designed to be run with even stock components.