Saw this at Randakk's...thoughts? Are you GL guys following this or just using the D8EA plugs.
Spark Plug Gap Deviation:
Finally, if you’ve upgraded to an electronic ignition (like Dyna-S) AND have aftermarket 3-ohm coils like Accel or Dyna – the spark plug gap should be increased to .032″ – .035″ to take full advantage of the ignition improvements you’ve invested in.
Special Note to Restorers:
The Honda-specified spark plug for the GL1000 is the NGK D8EA plug. However, when the first GL1000s were introduced, the specified plug was NGK D8ES–L. The “S” designation indicates that it was a “special” design and the “-L” designation means the heat range is a half step “cooler” than the norm for D8EA plugs.
Honda recommended the D8ES-L for all of the 750/4’s from 1969 through 1977, the CB350F, CB400F, and the GL1000 through 1977 were also included. Other Japanese manufacturers used them as well.