I pulled two spark plugs and they are the correct plugs per the manual. Do these type of two-prong plugs need to have the gap set? Or is it done at the factory? They have been in there for a while -

they had a bit of gritty oil/carbon on them, but i don't think they are fouled. I can't find any good pictures of a fouled plug to compare them too. I can wipe off the plugs with a rag and they don't look bad. I'll see if i can find some pictures online - and post a picture of one of the plugs right out of the cylinder later today.