[Nolimitz]

In my manual , the distance between the electrodes, for my type of engine, needs to be 1.0 - 1.1 mm ! That would be 0,039 inch to
0.43 inch . So why are you speaking of 0.049 - 0.053 inch ? 1.24 mm to 1.34 ? Actually the Iridium IX would fit better for me.
So what i`m saying here is that maybe , different types of engines may require adjustment from the out-of-the-box gap.

 

[Nolimitz]

Just tried to replace mine now . Bought the recommended ones , the ILTR5A-13G .
Got the first old one out and to my surprise it is much shorter. The threadreach is about 7mm shorter.
On the old one says Mazda BP13 18 110 .
I guess i should not do it , right?