Hey everyone, I’m new to forums so I hope I’m doing this right. Anyway I just put the Vent racing head and cam on my son’s 2013 rzr 170. It is NOT running right. It came with no instructions. I rotated the piston all the way stroked out. I have no idea how to look and make sure I was at TDC. Put the cam in with lobes facing down so neither valve was opened. Put it back togethern put a little gas in the carb, she ran for a minute but at an extremely high idle and was backfiring pretty bad. I shut it down and decided to get on here and ask for.help,before I tore something up. Please any info would be great.