Just received a used Enya .09 IV and, having no experience with r/c use or carb adjustments, I have a question:
The fuel inlet spigot is adjustable for intrusion into the barrel bore, so what happens to run characteristics when it's moved in or out?
Thanks.

Will you be using the throttle?  If so, and assuming that it has one, there's some art to setting up the air bleed so that it'll come out of idle cleanly.  Check back here if you need help.

If you're going to be using it as a big, complicated venturi, then you probably want to crank the air bleed in all the way.

Thanks, guys - thought so but wasn't sure.
It'll be used, at least for bench testing, 'til I get a venturi/NVA for it.

As long as you're not changing the throttle position a carburetor just acts like a venturi.  So you should be good to go.  It must be an itty bitty little thing.

Kind of funny with all this Enya .09 stuff going on. I just received my MK III about a month ago, and what a nice little engine it is. I could not find what I was looking for online, BUT, if it is anything like the III, you could just pull the carburetor and use it as is, as the carburetor is mounted inside the built in control line venturi.

... as the carburetor is mounted inside the built in control line venturi.

Here is a snip from the Enya III article.

It sounds like what they're calling the "restrictor" is what we'd call a "venturi" -- the thing would probably be to open for sport or stunt without a venturi, although if there are any vintage 09 speed events out there, leaving the intake as open as possible is probably the first thing you'd want to do.

It sounds like what they're calling the "restrictor" is what we'd call a "venturi" -- the thing would probably be to open for sport or stunt without a venturi, although if there are any vintage 09 speed events out there, leaving the intake as open as possible is probably the first thing you'd want to do.

My .19 4003 c/l engine has a removable steel insert to restrict the venturi further, Tim, and I suspect the .09 c/l would have one also.

Huh.  My Enya 19-IV has a conventional aluminum venturi.  Do you happen to have a picture to post?  I'm curious as to what it looks like.

The K&B Stallion had one also. Just a thin sheet metal insert formed to the venturi, with a split line and retained by the NVA.

Thanks.