I Have used autolite # 3116 non resistor plugs in my
old TO 35 for years.
On another forum it was said they have moved their
production facilities to China!!!!
I checked the spare box of plugs I keep on hand,
they were made in Mexico, do not see much difference
to me.
Anyone else have a U.S. made plug that performs as
well as the old autolite 3116? I might give them a
try this spring. Old tractor idles at 400 rpms
now, if it gets any slower, it will be like me and
just stop.
My grandsons little honda motor bike runs best on nkg plugs, never looked for them in a non resistor tractor plug cross reference to 3116.