Sparks

[Sargehere]

Champion UD-16: That's what they were called when I first found my UL Flathead, about 50 years ago. They're 18mm sparkplugs that were used by Fordson Tractors, among other things, which lead to their still being available at auto parts stores in the 'States. Still available, called just 'D-16,' today. They help keep our Flatties and Knuckleheads alive.

Bring that up because I can't keep from changing my old bag-of-bolts. Unless it's in a museum, it's never "done." I just came into a pair of new-made 9-bolt aluminium heads (Look like iron heads on the outside, KR heads on the underside) that use 14mm sparkplugs and I want to try 'um out, but I'm sure people with more experience than me know: What's the 14mm equivalent of a Champion D-16? or something even more appropriate (?) Not building a fire-breather, I hope. Just experimenting. Thanks in advance.

[Rubone]

J12Y if 7/16" reach, N12Y if 3/4", champion equivalents of the H-D 3-4 plugs.

[Sargehere]

J12Y if 7/16" reach, N12Y if 3/4", champion equivalents of the H-D 3-4 plugs.

Thank you, Robbie! That's egg-zackly what I was looking for.

[kitabel]

The Champion "U" prefix = auxiliary gap.

[Sargehere]

"Auxiliary gap." In case you lose the primary one? I wonder if dropping the "U" came with new meaning for the "U". I know they were some hinkey-lookin' archaic wire electrodes on um in the old days. Seemed to recall going allaway back to when you could take them apart and rebuild your 18mm sparkplugs.

[Omarttentmaker]

I contacted Champion years ago, and a factory rep told me that the U stood for use with unleaded fuel.

[Sargehere]

Thaat's interesting. Like back when "Amoco" was the only "white gas" -- meant unleaded?
We used to use it in our Coleman lanterns on camping trips.

[Jim]

Thaat's interesting. Like back when "Amoco" was the only "white gas" -- meant unleaded?
We used to use it in our Coleman lanterns on camping trips.

I remember that! But... I'm not sure if you can use the Un-Leaded sold today in a Coleman lantern or stove...