250r spark plugs

[Air-cooled-R]

How good are the NGK iridium plugs? I'm thinkin about trying a few. I'm currently running a B8ES and I'm wanting to go to a hotter burning plug. What burns hotter, a B7ES or a B9ES?

[MTS]

How good are the NGK iridium plugs? I'm thinkin about trying a few. I'm currently running a B8ES and I'm wanting to go to a hotter burning plug. What burns hotter, a B7ES or a B9ES?
BR7 is hotter, 9 colder....I have run the iradium plugs before....Kinda torn between them....they dont foule as easily as a normal plug i have found but thats about it...lol not worth the extra money i dont think..

[Ordo]

I've been running a Denso W26ESR-*Edited* with excellent results. You can get them at AutoZone for about $1.80. And you can see down the insulator much better when you are doing plug chops as compared to the NGK's.