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Spark plus don't fit caps!


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I went to a v reputable bike dealer today and payed just short of £40 for 4x spark plugs for my zxr400 L9 2003 model. They sold me NGK Iridium IX CR9EIX 3521

The old plugs have a thin small thread on the top and the cap pushed down onto it. These new ones have a much wider top and the cap doesn't seem to be locking down onto it properly. The other ones, the little threaded section really sticks into the cap and makes a good contact, these don't seem to lock down properly - I expect the metal is touching but not locking together.

What confused me however is that other sellers are selling the same plugs for this model of bike!

I also changed the cap, ht lead and coil and they are the same type on both the old and new one so clearly the cap is standard as well!

I'm a bike beginner... Am I missing something. There seems like a threaded hole to screw in that little extra part on the new spark plug but it seems part of the old one!

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