[45jim]

I wonder which A2 that is? I hope its Bart.

You have already established the engines are fine separately so follow the instructions on page 258 of the manual which cover the throttle linkage adjustment and engine synchronising.

Basically, disconnect the throttle linkage and then progressively reconnect the linkage from rear to front checking each section as you go to isolate the problem area.

The linkage bearings in the governor case are also a known problem area in the 6-71. The lever often moves easily when not connected to the rest of the linkage, but when connected up the side load binds the bearing. If its not Bart, we had changed out the governor covers and bearings to cure a similar problem. But that was a long time ago.