its only $7 for one, before my bike took a dump on me i pulled it out and ran it with the old plug to get a feel for it and see how it ran and then i pulled the plug out and the thing was massively black and had alot of build up on it, so i cleaned the stuff off with a wirebrush then stuck it back in just to get another feel for it with it somewhat clean, ran a little better then the big test, i put the iridium plug in and can i say WoW...it started right off the bat, once it settled down and started idling it was way quieter and alot smoother idling than before
id say go find ur lil change holder and go cash the change in and get a plug, its worth it in the long run i think, although im not sure how long in the long run is becuz i had no top ring on my piston when i went riding the next time around and have to now gonna bore and get new piston and rings