Originally Posted by
HillRider
Another possibility is alignment. External bearing cranks are very sensitive and the bottom bracket shell ends must be parallel and in line to very tight tolerances. You might have to have the shell faced.
THIS
Also, were there any shims installed on the crank axle? I'm not familiar with that particular installation but, you might have to leave out a shim if installing the arms is what is causing the binding. Does the ales spin freely with no arms installed? If so, it's a shim issue, if not, you probably need to face the bottom bracket shell.