Hi I’ve bought a polaris 170 for the young fella.It was running real rough cold but o.k. hot took it to the dealer for a tune now it’s running like crap cold and hot.We use it at sea level it’s got an aftermarket k & n air filter but standard exhaust.The pilot jet is standard the main drilled out,float level set high,needle clip 2 slots up from the thin end,surges when running.Any suggestions for settings and new main jet would be great.Son is not happy.
Utah RZR Rentals

whence