I have recently noticed when checking the tracking of my trex that if you hold the heli sidewise and power up to at least past 50% power the tracking of the blade tips in the forward path of the blades is perfect but the tracking on the tips on the aft path is slightly off. Not much ,just maybe 1/8 of an inch. Cant seem to get both fwd and aft perfect tracking. Does anyone have any suggestions as to why they would track like this and the way to correct this problem?

Thx

2 things, don't power up your heli while you are holding it.

If 1 side is out of track and the other is in track its usualy a paddle alignment problem not a blade problem. Verify your paddles are aligned perfectly.

By holding the heli you put a load on the main blades. In the forward path the blades will track fine but like a gyroscop a force applied will affect 90 degrees after the applied force leaving the rear path out of track. NEVER HOLD YOUR HELI WHEN THE BATTERY IS PLUGED IN!.

While holding the helicopter there is no "backwards" or retreating blade as there is no relative motion there is no advancing or retreating blade.

Make sure your FlyBar holder is perfectly flat. Loosen the 4 screws and flatten it by eye, then tighten screws. I had the same problem, fought with it for hours.