ORIGINAL: Flyboy Dave
You do not need, nor will it help to use an idle-bar plug in that engine.
Use a K&B-1L plug in it.
Dave,
Are you sure about that?
This K&B is the older, loop-scavenged variety, for the likes of which the idle-bar glow-plug was invented.
It is more likely to throw raw fuel at the glow element, against which the idle-bar is supposed to protect.
There are some Schneurle engines (MDS?) that also need the idle-bar to run right.