Can new spark plugs really make a difference?

[Dcook65]

Also I should mention. To this day I have never had a "pre-gap" plug actually have the correct gap it's suppose to. That includes these plugs. I use these same ones for my boat motor and everyone is a different gap every time and yes I'm aware you have to adjust this plug with the special tool that doesn't put pressure or touch the center.

What special tool? Oops, missed the video.

 

[TJ2]

This design is far less likely to damage a platinum or iridium coating like many of us have shifted to.

This is something I never thought of.

 

[AndyG]

This is the only style I'll use as it is less likely to damage protective coatings like platinum or iridium. Tapered tools encourage the user to slide the spark plug's gap along its surface to set the gap which is only satisfactory for conventional plugs without platinum or iridium coatings. The below tool has a pair of gaps used to grab the side of the electrode to bend it to the desired gap which is then measured by the wires. This design is far less likely to damage a platinum or iridium coating like many of us have shifted to.
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actually if you look at the circular hole on the first tool illustrated you'll notice that it has a taper... That part of the tool is placed over the plug and you rock it backward to open the gap, kind of like a bottle opener.

Then you're just using the tapered part gently to determine the gap.

I'm not saying it's the better tool but I'm just saying that I think it's design may be misunderstood.