Here in Boston we just had the hottest July on record, so I took it upon myself to do a thermal management mod for the TSDZ2. I was routinely having to dial back my assist usage to stay below 75C on my 23 mile (37km) round trip commute so I decided I would do something about the TSDZ2's awful thermal management (Love the motor overall though).
What I ended up doing was two things...
-I filled the air gap around the motor with a thermally conductive silicone pad so that it now has something to shed the heat to the outer casing other than a not very thermally conductive pocket of air.
-I attached some aluminum fins to the casing of the TSDZ2 so it will cool down quicker. To do this I sanded down the casing to the bare aluminum and then attached some aluminum electronics heatsinks with a thermally conductive epoxy. These work very well as there is constantly air flowing by the bike as it moves along.
These two things have made a huge difference. I pushed the motor extremely hard on my commute yesterday at 4x power multiplier and it never got above 58C. Before when I would use the bike at a much lower assist level I would be right below 75 by the time I got to work.
I attached some crappy phone pictures below. if there is enough interest I could do some DIY instructions, but overall it was not a very complicated process.

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