This is one of the DUMBEST debates ever...There is only ONE NGK CM6...No matter what the box it comes in says..ONE, no matter what part number it carries...ONE......
Honda and 3W have been using these for YEARS.....
T O M has more DOCUMENTED HOURS with 3W engines running NGK CM6 spark plugs than anyone else on the PLANET....
Champion amd Denso make spark plugs that are the same size within a few thousandths of an inch..It would be interesting to know if T O M has used either of these....