** This thread discusses the Content article: Shorten a Sparkplug **

Good article. What size are the threads?? I'm going to give it a try my cowl on my new thunderboat is just hitting the plug.. Does this change any properties of the plug??

There is some extra information in this thread: www.modelgasboats.com/index.ph...=5&id=2352#2352

4-40 seems to work well. I have not heard of or experienced a difference between a shortened plug and regular one. Maybe it does affect it though, can't tell for certain.

I am going to try this with a silicon carbide wheel, and just tack on the cap nut, I could use shorter plugs, I think it would be a neater look.

mike sr

Wish i had the cutters to do this. I have a brand new Iridium plug i cant use cause its too tall for both of my boats

Look here Will....I am sure there are other places you could get them from too.

www.leevalley.com

Search for Diamond Carving Disks.