I've got a new set of Denso IK24's.

Do you just install them at the factory set gap like platinums?

Honda spec for stock plugs is 1.0-1.1 mm new, 1.3mm service limit.

 

It's pre-gapped I believe, just install them like normal spark plugs ... That's what I did, no problems whatsoever. You don't need to do any ECU resetting as well.

 

They claim to be pre-gapped but they are not suitable for the S2000. I tried them before I checked and felt there was a decrease in power. Pulled them and regapped them that really improved the way the car ran.

Try not to touch the center electrode when gapping to .04 in. Use anti-seize on the threads and be careful to torque right at 12-13 lb/ft.

 

[QUOTE]Originally posted by cdelena
[B]They claim to be pre-gapped but they are not suitable for the S2000. I tried them before I checked and felt there was a decrease in power. Pulled them and regapped them that really improved the way the car ran.

 

mine varied as much as 0.02 out of the box; two of them were the same (forget the numbers) and the other two were different. None of them were at 0.04

 

I'm running mine at 0.050"

 

Hey Harry, no real sound logic here, but I can make some up
If the larger the gap the better (to a point of inconsistent spark or other effects, timing variation...???..!!) then the upper bound of the service limit seems reasonable since the Iridium electrodes are supposed to last crazy long. If the service limit is 1.3mm (0.0512") then 0.050" seemed a good place to be.
I don't know
That's what I'm running mine at until someone scares me back to nominal

 

Follow up:

- Stock plugs at 11K where in great shape.

- If you haven't done this already, remove the connector to the coil/plug connector instead of trying to remove it as one piece. Only really required for cyl. #4.

- Used Anti-sieze (small amount!) on the threads, very small dab of di-electric grease (silicon lube) on the boots.

- Gapped to .040, torqued to 150 inch-pounds (don't get many opportunities to whip out the snap-on 3/8" inch pound torque wrench!)

 

After thinking about RT

 

I thought the proper spark plug was the IK22, not the IK24? Or was that a typo?