<HTML>I really hate those NGK plugs....
Try matching up with Champion Plugs, see if there is a cross reference from an NGK to a standard Champion plug, then cross-ref that number to a platinum plug, if one exists.
I did this with an 89 Tomos TT Golden Bullet, and the Tomos Trike and it did wonders for the performance, when you only use one plug, get the best out of it.
FYI - The champion index number for the Tomos plug is J82C, for those Tomos owners wishing to ditch those crappy NGK's
Also, try to avoid the Candian-Made Champion plugs, if you can, they do not seem to last nearly as long.