NGK DCPR7E Spark Plug

[JDhog211]

I know there's a lot of bikes running the NGK
DCPR7E plug in replacement of the HD 6R12.
I was looking into the NGK DCPR7E-N-10 plug
Because of two reasons. The plug has the solid
terminal on top, and the plug is pre- gaped at
.040.
The plug is identical to the NGK DCPR7E, which
Comes gaped at .028 and a screw on tip terminal.
Any thoughts appreciated.
Thank you

[Hossamania]

Can't comment on the plug, but I will say I never trust a pre-gapped plug, I always measure.

[JDhog211]

Me neither, I always check gap on all before install.
My point here is the two plugs I mentioned are the same
Except the one with the solid terminal, and a pre gap at
.040 sounds more like or OEM HD 6 R12.

[smoserx1]

I have used the iridium version of that plug and like it.  With the iridium plug one you should not attempt to change the gap due to the fine center electrode getting damaged, but as one physics professor told us years ago: "the human eye is very accurate."   If you have even a modest amount of hands on experience with spark plugs you should be able to look at a gap and tell if it is reasonably close to specification.  Back in the 60s and 70s when ignition systems on vehicles were weak, narrow gaps were necessary for the relatively low voltages to fire, but with today's high voltage coils you can get by with a much larger gap for a much longer period of time before the plug is in danger of misfiring.  I wouldn't hesitate to use either the .028 or the .040 gap version of that plug just the way it comes out of the box.  IOW, I just don't think it makes much difference.

[JDhog211]

It just makes sense to me to run a plug with
A solid tip terminal like the OEM 6R12. Also keep
In mind it comes out of the box gaped at .039.
It's the NGK DCPR7E-N-10.

[Deye76]

The difference in the plugs is the pre gap because NGK doesn't recommend adjusting the plug gap more than .008" in either direction.

[88b]

I use them , never had a problem but I always check the gap

[Panzer]

Can't comment on the plug, but I will say I never trust a pre-gapped plug, I always measure.

with Hoss, many a box has been dropped, no box damage but the electrode end is hit.