Okay, new 4 in 1 is installed.

First off, the red light does NOT come on until the throttle is nearly buried....

Now, we have a new set of symptoms to review:

Helicopter lifts off and begins to pirhouette hard to the right. Full left rudder almost makes it stop, but it still drifts nose right.... This is a new symptom.

Also, with the rudder buried to the left, the helicopter will not maintain altitude, and settles gently down to the ground...

With the rudder allowed to center, helicopter climbs briskly and seems to have plenty of power... climbs strongly while spinning...

When left rudder is re-applied, helicopter almost stops spinning, hovers for a couple seconds, and then gently descends to the ground.

Any ideas????