Spark plugs

[ChristoT]

For the first time since I've had the bike, I took a peek at the spark plugs. And foc me, they're in a bad way. I only checked plug 1, but skinned my knuckles badly when doing so, and had a fight getting it out. Plug 3 also had rust marks on the bottom - gonna be painful removing that.

What plugs do you use, are the expensive ones worth it, and how much should I expect to pay for new ones?

Thanks!

[smg id=962 type=preview align=center caption="I think that's focced."]