Ok so I was ordering some parts off Rocky Mountain ATV for the RZR and saw the NGK iridium plugs were listed as fitting my machine, so I grabbed a set. Ran them for 200 miles and now its having some idle and start up issues thought it might be the IAC valve so I cleaned that but still having issues. upon further research I found a couple threads about the spark plugs and that some say the iridium are too cold of a plug, lots of numbers and types but no definite answer on which plugs are safe. These are the plugs I have currently CR9EIX some say the CR8EIX is hotter but then some say to run CPR9EB-9 which are the copper cores like the stock champion plugs. So whats the best plug to run?

Utah RZR Rentals

whence