A guy around here thats well known for building race motors for cars said they will sometimes gap the plugs smaller than spec. His last name is bischoff.

 

gotta revive this post, im finishing up all my winter projects on the bike, got the cctl done, air filter, and got to the spark plugs last night and had a question. i couldnt find what the gap is supposed to be in the manual, i just see what ppl are saying online about .8mm-.9mm ; i did see in the manual where it says the 1.0mm feeler shouldnt be able to fit in the gap, and also most ppl are saying they didnt adjust the gap.

question is, the new plugs gaps are all bigger than the 1.0mm feeler gauge, what is the proper way to adjust them without damaging the plug? what should i adjust them to?

 

If I remeber correctly,

A small gap gives a weaker spark.

A big gap gives a stronger spark but also slows it down

Those of us with genuine tool kits know what size to gap our plugs as we have the the gauge.....

 

yea i have the genuine tool kit... and the genuine tool kit feeler gauge is 1.0mm... and all the manual says is that the feeler gauge shouldnt be able to fit in the plug gap. with all my plugs, it can, so i was wondering if there was any official info on what they should actually be. i see most ppl say .8 to .9 mm, just wondering where that came from...

and a few ppl in this thread said they adjusted them the correct way, i didnt know if that was different than the standard way you do plugs, since these are iridium, etc. just wanted to make sure i didnt damage them by adjusting wrong, or letting the feeler touch the plug tip

 

In my under tray at the storage compartment mine has a stcker that talks about emissions and it says to use ngk imr9c-9h, nd vuh27d or equivalent. Gap.8-.9mm. This is what it says for a 2002 f4iundertray.