For the past year I've been adjusting my idle mixture based on transition from idle as per manufacturers instructions and what I've read on this forum. Irecently had to learn how to work an air bleed adjustment on my YS, and the directions for that were to tune the mixture to maintain a steady idle RPM over a period of 15 to 20 seconds, and not based on transition or a fuel line pinch.

I'm not 100% sure how these carburetors work, but it is my understanding that the engine uses suction from the piston's down stroke to draw in air and fuel at idle; with the carb barrel in the idle position this places a good amount of suctional draw on the spray bar, pulling in fuel. So no matter what style of mixture valve is on the engine, the principle is the same. Please let me know if I"m missing something here.

So, Iapplied the same methods to tuning my 2 stroke engine, by setting high end a few hundred RPM down from peak, then dropping to idle and watching the RPMover 15-20 secons. My transition was totally fine, even after a short period of time, but Istill found that the RPM was dropping after maybe 10 seconds ( i.e. loading up with fuel). Ileaned out the mixture by about the thickness of a small screw driver blade each time and repeated. After 2 small adjustments Iwas able to maintain 2100 RPMidle for quite a long time.

Iwas able to drop my throttle trim and get a really, really good and reliable idle, and had an immaculate transition to full power.

So this worked really well for me. Ifigured it would be a good idea to post it and see if this is what other people are doing, and finding out why they aren't if not. I think it's important for people to understand how these things work and how to care and maintain them properly. Iand others have certainly had tuning issues with things not working out the way we think they should, and we all know how frustrating that can be.

This is such a simple thing to do and adust for and could have saved me a ton of time 'waiting for an engine to break in' or wondering why my midrange was not as crisp as it should be. Hopefully others can learn and put an end to their frustration, too.