Hi Guys
I have an OS 120 Four Stroke that my buddy gave. The engine has a timing type of a metal ring with a hall sensor pickup installed behind the prop washer. All it needs to be converted to gas (Other than EI) is a spark plug that supposedly fits the hole for glow plug. I have been told that there are special spark plugs made to fit this application.

I would appreciate any help in finding the spark plug that fits the glow plug threads/ opening the cylinder head (if there is indeed such a spark plug). Also if any hints tips to make this engine work on gas.
Thanks in advance.
Asim