Originally Posted by
johnboat
Tree,
On that tuning dial .... I didn't see GOs listed, did you do the custom measure order or did you choose on of the other engines that was a compatable size?

I ordered the one for the Novarossi carbs the number is NT116-R-B. If you can't find your engine listed then use a set of calipers (if you have them) and measure your HSN housing as directed on the site.
This was taken from R/C Hardware website:
Engines not in the list can usually be fitted with a N-Tune tuning dial.
Measurements must be taken with precision calipers or micrometers.
Diameter measurements are the most important and height measurements
are some what less critical for the designed fit.
Height is the distance from
the top of the housing to
the top of, or beginning of
the nut.