Why is my MJ1200 with SureFlow mod doing this?

[mike31154]

Aha, photos, fantastic. The difference in leading & trailing portions of that prop is nowhere near as radical as the one I have. As per your assumption, I don't think any previous owner has flipped it around, so you should probably return it to the original config. Hopefully it will still work.

If there are any hobby shops in your area, model boats, planes etc. check them out, they may stock small plastic propellers you can try in the place of the one you have... while you're waiting for the black one to arrive in the mail. Hopefully you don't end up breaking it in an effort to get it off again... good luck and we're anxiously awaiting the results..