KITFOX INFO, WEATHER ROTAX DEALER AND PARTS KINGFOX TIRES
The ones you buy from most automotive stores are Screw tips not Solid and they will wear like the pics below. Plus they are gapped at .035 and it hard to adjust down to .018.
If you buy them from ROTAX shop you will get them pre gapped at .018 and will look like THIS
The problem with using screw tip NGK plugs
Go HERE to see the differnence in gaps
Note the Blackened Alum tips that are showing wear on left side HERE