adamyorkie
Junior Member
Are they worth the extra pennies? Has anyone fit them to their FZ6?
I'm probably going with iridiums when I change plugs (which I'm probably due for), and gapping plugs correctly is very important. A set voltage (like that provided by the ignition coil) can only breakdown a certain length of air. And when plugs are incorrectly gapped (too wide) this air gap sometimes isn't broken down. Alternatively, if the gap is too small, voltage is wasted and a larger spark could have occurred resulting in an incomplete burn.
found somewhere that sold the iridiums for only £3 more for all 4 so have fit
For that little difference in price I would run them again.
I ran a set in my FZ6, at first the bike idled and ran much smoother but towards the end they didn't seem to be much of an improvement. I put OEM back in and they seemed to be about the same. I did not gap as Cliff suggested which may be why they didn't seem to last as well. I'm coming up on a plug change on my current bike and will probably put them in it after I properly gap them (thanks Cliff).
I would bet that your trouble with the first set had everything to do with the gap. The plugs were probably close to the upper limit at the start and ended up past the limit giving you poor performance.For that little difference in price I would run them again.
I ran a set in my FZ6, at first the bike idled and ran much smoother but towards the end they didn't seem to be much of an improvement. I put OEM back in and they seemed to be about the same. I did not gap as Cliff suggested which may be why they didn't seem to last as well. I'm coming up on a plug change on my current bike and will probably put them in it after I properly gap them (thanks Cliff).
How many miles did you have on your iridiums before you noticed degradation AL?
Not a big difference but a noticably smoother idle. I guess with modern ignition and fuel injection systems engines run much better than they used to.
Seems like I have 8 to 12 thousand, I was checking the valve clearances and wanted to replace while they were easy to get to. They didn't look bad at all and I could have probably re-used them. I was in the local dealer and all they had was a set of OEM so that is what I put in. The biggest difference I have noticed when replacing plugs was when I put the Iridum's in. Not a big difference but a noticably smoother idle. I guess with modern ignition and fuel injection systems engines run much better than they used to. My old Fiat 850 Spyder needed a tune up or something almost every Saturday! My FZ6 just ran and ran and ran. Lots of improvements over the years.