Listen to MinnFlyer & gaRCfield.  They are right on.  I have had this exact same issue w/a Saito 125.  Leaning the low end (a bunch) solved the problem.  Funny thing is that it took about 6 gallons before this "issue" appeared.  And, I had already leaned the LE a considerable amount during/after break-in. 

But now it'll quickly settle into a nice solid 1700rpm idle.  And transition hasn't changed...which is good because it was instant even before leaning.

I approve and pass motion!!

Thank you all for the help. I will give this a shot and let you know how it turns out. I mean the transition is amazing(instant)....especially since ive put a fast (.09) servo on the throttle...its SICK!!!!!!(good thing)

In the mean time - Happy flying!!!</p>

I agree!

The Saitos run slobberingly rich just fine, but the symptom of this is as described, strange idle performance.

I went through exactly the same thing before someone taught me the error of my Saito tuning!


As suggested to me, his best bet is to crank the LS needle down just until the engine will not start at idle, then back off about 1/2 turn or so.


The Saitos run rich when other engines would conk out completely. This tends to confuse people used to other engines.
I've seen many people assume that Saitos were too lean because they were used to the characteristics of most other engines.

You are right Opjose...Ilove my saitos...but their tuning can be confusing to me. Obviously its something I havent mastered when trying to diagnose.