great vid - thx!
I'm gonna pick me up an O2 sensor/readout and find out where I'm at.
Generally I find my plugs to be a bit rich.
Cheers,
PeteZ
On Mon, Feb 13, 2023 at 2:11 PM n7188u <chmgarb@gmail.com> wrote:
>
> Hi everyone,
>
> I promised an update so here it is.
>
> In a nutshell, I decided to follow my eyes, which were looking at very
> white rear cylinder plugs. So I decided to move the needle from position #3
> to position #4 and enrichen the mid-range mixture.
>
> The jury is still out since I only did two flights since the change but
> the difference is notable in terms of engine smoothness. But too early for
> final conclusions. I did pull the plug and it looks a more reasonable light
> tan now which I think is an improvement. I will report back on the
> mid-range adjustment once I do a few flights in different conditions.
>
> But what really caught my attention is that for the last three years, even
> with changing to a new engine, I had to put up with crappy idling 912Ss (at
> least by my picky standard). I always thought that that was the way these
> engines idle, particularly the high compression 912S.
>
> Well, I finally decided to play with the idle mixture. I had moved the
> idle screw a flat or so in the past to see if anything happened but not
> much did. But this time around I decided to move the screw in or out one
> flat at a time until something happened. Well, what a pleasant surprise
> when the engine started to get smoother as I screwed the needle in but not
> until you are at less than one turn from fully closed. And I mean HUGE
> improvement. All the roughness went away and now it idles smoothly.
>
> Again, I still have to fly more with these settings but what a difference
> so far.
>
> I told a Rotax 912S owner friend of mine all this and he recommended I
> watch this video. I think it exemplifies my newly acquired conviction that
> the carbs in the 912S have to be tuned beyond just the simple balancing.
>
> https://www.youtube.com/watch?v=GxEORpdJp0w
>
> Best,
> Chris
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=510157#510157
>
>
|