Plugs need to be AC Delco 41993 (no substitution). I've had misfires with other "equivalent" plugs that went away with the correct plugs.
I did replace the spark plugs at 70k miles
The orientation of the spark plugs suggests that this one has the water-cooled two-stroke engine.
Rx-8 in 3years just did maintence and ned sparkplugs 0 problems.
If you have a bike that fouls plugs easily, particularly with condensation, the pointy electodes of an irridium plug will still spark. My XV535 would get regular plugs wet with fuel and condensation in winter and then refuse to start. Started reliably on iridium.
denso ik22 works also, also an iridium tipped plug
I personally run NGK without any issues.
Just got a Jetta again - 2010 Limited Edition just shy of 100K miles and I've got one problem with it. From a cold start, usually in the morning, the 1st 10-15 seconds run rough before settling down to idle.
Throw them away, they're shit plugs. Autolite just didn't crack the code for making quality iridium plugs at a super cheap price. I wouldn't even put these in my lawn mower.
I’ve heard bad things from mechanics about Bosch, specifically Bosch platinum.
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