setup brushless 420lf Align motor & bl25t esc per instructions.Problem is when I throttle up speed stays low & doesnt change.Am I missing something?Thanks for anyones ideas.

Any chance it's your throttle curve??? Also check for smooth gear mesh and belt mesh. Are all parts lubricated and running smooth? Be sure your running mid timing on the motor, low timing may cause this problem?

I had a problem like that and it turned out to be my 25a ESC. I switched to the 35a and no more trouble. But check your gears etc. like the above post say's.