craynerd Posted October 11, 2014 Share Posted October 11, 2014 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 3521The 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! Quote Link to comment Share on other sites More sharing options...
craynerd Posted October 11, 2014 Author Share Posted October 11, 2014 Oooooopppps They unscrew off to reveal the threaded end Quote Link to comment Share on other sites More sharing options...
cockercas Posted October 11, 2014 Share Posted October 11, 2014 Iridium sparkplugs should be gapped larger then normal plugs. Quote Link to comment Share on other sites More sharing options...
Tango Posted October 11, 2014 Share Posted October 11, 2014 Oooooopppps They unscrew off to reveal the threaded endLol.......lesson learned....... Quote Link to comment Share on other sites More sharing options...
JamBerryKing Posted October 12, 2014 Share Posted October 12, 2014 Hahaha I made that mistake earlier this year, I felt like the biggest numpty ever Quote Link to comment Share on other sites More sharing options...
eastanglianbiker Posted October 12, 2014 Share Posted October 12, 2014 what else can i say well done for admitting you found the reason tho Quote Link to comment Share on other sites More sharing options...
Joeman Posted October 12, 2014 Share Posted October 12, 2014 Lol I once chipped a tooth trying to remove one of those stupid little screw caps. Quote Link to comment Share on other sites More sharing options...
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