Is VDST Software Unstable?

[2 Wheel Wanderer]

same here...have been adjusting my trim settings all over the place....  is 15 working for most people?

You need a gastester to set everything correctly in conjunction with the VDSTS. If you have played with the air bleeds you wont know if one cylinder is running at 3% and the other 6%. If the last person who touched your air bleeds was a Ducati Tech and you don't have a gastester I would bump up the trimmer at idle until the bike starts stumbling, then back off 4 or 5 clicks and save the value. Ride the bike and see how it feels. If it feels a little lazy back off a few more ticks until it feels right.

I was in the same spot, I said screw it and bought a Gunston Gastester from Desmo Times. Whats another $227!

Edit: I am not a mechanic but I have been working with my bike, VDSTS and gastester for a few months and have gotten familiar with them, but my bike has other problems.

[ZOSO]

same here...have been adjusting my trim settings all over the place....  is 15 working for most people?

Adjusting fuel trim adds or removes a small amount of fuel at idle which does very little at higher RPM.  The fuel trim will have its greatest effect at about 4000 RPM and under.  It is similar to the effect of the pilot jet on a carb-equipped bike - mainly affects idle to <25% throttle.