Agreed, and that is what I thought too...
However, please see the photos below, it is fairly clear that they are not immune
The good news is I have a good preventative maintenance regime now which takes about 40 minutes to complete. My local trails are in a forest so I had to install small pieces of foam into the 3 areas where water, mud and pine needles were getting in. The foam stops all the mud and pine needles but still allows water in. The water flows through and out of the sump holes now as it should. Before, the mud and pine needles just clogged the sump hole and the water had nowhere to go...... hence the photos below due to major build up.....
I also use corrosion block spray on all the connections now which works as a very good water barrier. Now, as long as I take the covers off every week if it has been raining a lot and dry everything out, it appears to have resolved the issue.
I know many people on the forum live in much sunnier climbs so will never have this issue. For me, an IP67 motor would be more preferable for my location.
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