MZ5
Well-Known Member
FWIW
I personally would use the old used NGK plugs before I used Champion plugs in a HONDA. Champion plugs have a poor reputation in almost all Honda products from lawn mowers to autos and motorcycle. Some of the concerns are misfires, fouling and thread galling or sticking in the head.
Although I try very hard to use NGK spark plugs in Japanese engines, the only plugs I've ever actually had pull threads out of cylinder heads have been NGKs. YMMV.
I wouldn't have the slightest hesitation using Champions, but I acknowledge that I _might_ find slight benefits in some way from sticking with NGKs.