plugs

I have a 2007 Fz1 and it sputters at low rpm's only when completely warmed up, then under about 2500-3000 it runs bad occasionally dying and turns over about four seconds before starting. I've changed the coils and the plugs, waste of money cause I didn't help. My bike has 57.000 miles on it...

My friend has a 91 Suzuki bandit and can't join the Euro based forum and we don't know where to ask. It's a carburetor based question.. thanks in advance to anyone willing to help. Replaced all 4 spark plugs for maintenance. It worked fine the day before. Right after replacing plugs it...

Sure this has been beaten to death. But here goes !! Any advantage/pitfalls using the cr9eik iridium plugs thanks chaps

I changed the spark plugs on my bike yesterday, and I was a bit worried when I saw the condition of the old ones. What do you guys think?

So with it being winter here in michigan with snow on the ground im gonna do a pm on my bike while im not riding it. One of the things im going to do is change my plugs. I normally run ngks in all my toys. Just wondering if any of you guys have found a specific plug that the gen 2s like or what...