i bought the quad used and checked the plug, its a ngk dcpr6e, is this the right plug for this machine, if not y would it be in there? its got a hmf pipe, if this is'nt the right plug for my settup, what one would be....thanks

 

the plug that should be in a stock 500 predator with a fuji 500 motor is specified by polaris as a NGK DCPR8E gapped at .035" now thats stock im not sure about your aftermarket pipe or anything else you have but it is a warmer plug.