Spark plugs

[blue62]

Originally Posted by Frodo

Well...don't want to be guilty of piss poor auto methodology.

So why, pray tell, does NGK (and presumably other manufacturers) tell us NOT to do that?? With a big RED slash through the pic of someone doing exactly that? It makes zero sense to me. Why do they want to set their plugs (and themselves) up for failure??

A rhetorical question, probably, but one that needs to be asked..

Most likely because people today have lost touch with the simplest of mechanical ideas and tasks.
Let me ask a question or two.
How many miles have those plugs traveled from manufacture to your hands??
How many times have they been banged around? Dropped? handled?? moved???stocked??? restocked.???
All you have to do is drop one on your garage floor before installing it to close the gap on a spark plug.
Then what do you have?????? Improper gap!!!!....possible misfire!!!!... Then you have to pull the plug to try and figure out why you have a misfire. Then you need a new plug crush washer because crush washers are designed for one time use.
When all you had to do was verify the plug gap was to spec. before installing it.
Verifying things like plug gap can potentially save loads of tail chasing.

It is also proper automotive methodology.