Adjusting carb with cowl on

by michael
(jonesboro arkansas)

Just finished installing a 91 surpass os engine on Extra 300. I have no idea on how to set it up to adjust carb with cowling on.

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Adjusting carb with cowl on

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Use a needle valve extension through cowling
by: Matt

Hi Michael,

If you look closely you will see that the high speed needle has a place where you can insert an small allen wrench or any type of stiff wire to extend the needle valve. There should be a small set screw to hold the extension in place.

I usually take a dremel tool and make a hole in the cowling for this extension to stick out. As long as the engine behaves, this works perfect.

Cowlings look really nice and add a lot of realism to the airplane. But the drawback is that the can be a royal pain in the butt if your engine is giving you problems.

If I am having a lot of trouble getting my engine to run correctly on any given day, I will just take the cowling off until I get her lined out.

But having an extension on the high speed neede to the stick through the cowling works fine for every day adjustment.

I would take a picture of one of mine for you but my wife is out of town and she has the camera!

But you can find a picture of such extension on this post from RC Groups.

Hope this helps.

I would love to see a picture of your bird when your finished!

Submit it here if you have time!

Good luck!