My sons 2012 rzr 800 will start fine when cold but after running for about 3 minutes it sounds like it drops a cylinder and eventually dies. Wont start till it cools down. After cool down for 5-10 minutes, it has trouble starting but will start. Sometimes it will run ok and sometimes not. When it is running it has a fairly loud ticking sound. Checked fuel pressure, ok. Checked plugs and they are pretty light color and dry. Cleaned the visible ground and power terminals, compression is 150 on both. What is ailing this thing?
Utah RZR Rentals

whence