Re: Denso Iridium Racing Spark Plugs
The OEM factory Plugs on the k7-k8 are actually very good items, I would stick to that. Just because it is more expensive, it does not mean they are better. Plugs are a very particular item, must be very close/exactly whats required to get the desired results. learn to read plugs and then choose the correct heat range as per service manual instructions.
The oem k7-k8 was the first time suzuki (in the litre bikes) went to iridium, and if my memory serves me right, they poke 1m further down into the combustion chamber than the previous OEM prescribed coppers. The k7-k8 are a special plug 0.9mm gap, and 0.6mm electrode tip.
I assume (assume nothing right...) you are talking about the denso race plugs with the 0.6mm gap and 0.4mm tip, if you use them let me know what you think. As I said earlier best to give it what the factory recommend. I use the k7-8 plug in my k5 only because they use the same coil packs as the newer models, and just read the plugs...
GSXR = The go to thrash bike