ok i put the iridium hgk plugs in my gl. on the other forums that i am on they love them. they are supposed to get 100,000 miles on cars. Now onto my bike. they are $6.99 at advance auto. they wont have them but they can order them and it does not cost you anymore. I like them. I did not notice any more horsepower or crap like that but what i did notice is easier bike sitting starting. the gl500's are bad starters when bike sits for very long. this has seemed to help in that way. the other thing i noticed is i can run up from 20mph in 5th gear. now i aint saying its smooth but now it can be done. I decieded to used them because what the heck $14 and you got the best plug you can! i dont think i would put them in a v8 but thats just me.
one thing to know about using Iridium plugs, if you have a dual coil (not so much on these old bikes) is that one side fires the plug backwards (polarity) they do make plugs with both electrode plated otherwise you lose the benefits of the plug
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