Broken Water Pump Impeller

[moto9]

A guy I ride with was having weird overheating problems.
When we saw coolant in the trans oil I know it was time to tear it down, and as stated the impeller was split in half.
He did order a aluminum one to replace the plastic one.
I don't see an advantage to using a plastic one except cost savings, if you want to build a better bike their are some areas that you just don't cut corners.
I just wanted to post this so it may help others with over heating issues.

The good news is we also did a top end (same time) at 127 hours and everything looked great except the reeds were chipped at the edges.