I am new to the Hobby, so I have a lot to learn about it... BUT... Is what I am seeing true???

I have been breaking in my first engine, a Super Tigre .45 ABC... It starts fine, as long as you prime it well it will start first flick...

When running the throttle response is very good, if I flick from full off to full on the eninge responds immediatly etc...

BUT I have Noticed twice now that my Super Tigre .45 ABC seems to run is reverse sometimes...

When I started it the plane lurched back, at first I though it was the ground, but them a saw that the plane actually had thrust from the prop pushing it back... Needless to say it run badly, but to have thrust in the opposite direction it must have been running clockwise, no anti as it should be?

I killed the engine, then started it again and it again run the wrong direction, then it was about to stall and it just corrected and run properly???

After that I run two tanks full of juice and it was very sweet indeed...

Any ideas?

Please do not ask me if I flicked the prop in the wrong direction when starting, I did not...

I can't say for sure that the engine is running the wrong way, but the prop is making reverse thrust, then when the engine warms a little and is restarted, everything is sweet...

It's not really an issue but I am worried the engine may be damaged...

Matt