Is it as easy as unscrewing the old one (when engine is cooled down) and screwing in a new one? Just got my NGK B5HS spark plug from spookytooth for my skyhawk 66cc.
Where do you live that replacement plugs dont come with a screw top?
Seems pretty weird, they'd save about 5c and make it grossly inconvienient to use them (say, if broken down).. Unless I've misunderstood you..
But basically, if its tightly screwed in, and the plug fits, and (most importantly) it runs, then obviously you're fine.
Don't forget to gap it.
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How do I go about this?