I went to replace the plugs on my 04, the one's I took out were Denso IK24's with the threaded head. I ordered some NGK's sight unseen, thinking they would fit, but of course they have the large non-threaded head and the boot does not fit over them.
Every picture I can find of replacement plugs show the larger head, even pictures of IK24's.
So my question is which plug should I use that has the threaded head? Do i have to replace the boot?
usually the heads are threaded you just have to unthread the top of the plug. they come with a piece that is optional for different style boot, in otherwords the spark plug is meant to be used for 2 boot applications. Try un threading the top piece, generally they are just tighter than finger tight. Ive never seen it any other way and ive been changing out plugs for 30 years.
thats just weird and retarded, I just threw all my old plugs out a few weeks back when cleaning the garage. musta thrown near 30 plugs away... but anyways never even since a lil kid changing out the ones in my dirt bike or lawn mower... they always come with the top removed so the threaded portion is exposed and the tip cover was loose in the box. I remember shaking the box when id buy them to make sure it was in there... sometimes they would fall out or maybe people would steal them...
If you want threaded head plugs for the RC you have to use Denso. Found that out when I did my CBR coil conversion. BTW, Honda OEM Denso's don't have threaded heads, so don't get those(found that out the hard way)