Hi, does anyone know what the venturi size would be for this motor ? Choices are 6.5, 7 and 7.5mm

Thanks, Scott V.

The Enya needle valve assembly has a much bigger cross section than general O.S. FP/LA variety.  The 7.0mm might not be too out of step from a choke area consideration.  Brett Buck has written some good essays on venturi choke area on the LA25 which *should* apply generally to the Enya SS25.   You might like the larger venturi to get appropriate power from the engine.  YMMV.

6.5mm =.255"
7.00mm = .275"

The benefit of going with a smaller venturi is that you can always make a small cylinder of sandpaper and abrade it larger and doubly so when the venturi is made of plastic.

Use  the  7 or 7.5 mm  venturie  with the Enya  NVA  , I would use the  7.5  unless it went on a very small light model

Randy

   What is the diameter of the Enya spraybar?

    Brett

0.155" for the Enya spraybar.

I would think the larger venturi, as Randy suggested, would be the way to go. While you can open up the smaller ones, that's not generally a field adjustment while with the larger one, a layer or 2 of panty hose material will effectively "detune" it and can be adjusted as needed at the field.