Looking from behind the plane, as an on-board pilot would, does the front of the engine angle to the right or to the left?

Most planes have a degree or two of RIGHT thrust, not left thrust.

Check the angle of the firewall.

I find it hard to believe that the plane was manufactured with left thrust, maybe this merely a problem with the mounts.


If so... washers will tend to wear into the plastic mounts causing a loosening of the mount over time and lessening the effect.

I find it better to sand the mount bottom down, by running the mount on medium sandpaper at a very slight angle (more force on one side really) or for an even quicker solution I use a belt sander or bench grinder to do the work.

This permits me to adjust the thrust line and keep the entire base of the mount in contact with the firewall as it should.

Of course things are different with metal mounts....