Brian,


Believe it or not, with all my experience, I never ran an engine on FAI 80/20 fuel.
Over 95% of the fuel I ever used was 5% nitro.

So I was speaking from experience of others, model magazine engine gurus among them.

Adjusting nearly any engine to use 5% is very easy.

I can take your word for the ease of adjusting, but I guess it is the placement of that 'easy/difficult break-point', for each individual modeler.


Specifically for MVVS, using 5% nitro makes the ideal idle needle adjustment quite narrow.
Maybe 15% will make the range a bit wider, after adding that head shim...