Spark plugs with a threaded head - Honda RC51 Forum : RC51 Motorcycle Forums
 
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post #1 of 8 (permalink) Old 05-22-2011, 09:54 AM Thread Starter
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Spark plugs with a threaded head

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?

thanks.
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post #2 of 8 (permalink) Old 05-22-2011, 11:14 AM
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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.
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post #3 of 8 (permalink) Old 05-22-2011, 04:30 PM
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Usually the screw on tip is aluminum (or was in the past).
I looked at an old NGK iridum from my last plug change and the tip is not removable.
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post #4 of 8 (permalink) Old 05-22-2011, 04:37 PM
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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...
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post #5 of 8 (permalink) Old 05-22-2011, 04:40 PM
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I agree. I the old days, pretty much all spark plugs came with the threaded aluminum tips to accommodate either plug cap type.
Apparently not anymore.
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post #6 of 8 (permalink) Old 05-23-2011, 10:17 AM Thread Starter
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Tried taking the caps off...that didn't work, they don't come off.

Oh well, i guess i'll just clean off the old ones.
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post #7 of 8 (permalink) Old 05-23-2011, 10:49 AM
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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)
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post #8 of 8 (permalink) Old 05-23-2011, 09:04 PM
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Threading head !!

There was a post on Speedzilla a while back about threading the NGK's on a lathe. I'll look for it. My take is a drill press and file HOOVY

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