Why is my MJ1200 with SureFlow mod doing this?

[Tom R]

I could not stop the larger propeller from going the wrong way. I tried inserting washers to take up the slack I finally glued it and even the it would go the wrong way. I finally switched to the smaller propeller and it has worked ever since. It must be something to do with the torque on the large propeller and the wear and tear on an older MJ1200. Have you tried a new MJ1200 to see if that works. I believe MJ1200 will run in either direction. I have just turned the plug to reverse the flow however after a period of time the pump will reverse direction again.

I would not buy another one of these mod kits. I contacted the maker and they sent me all new parts in an effort to get it going.

Tom R